2013 Oklahoma Collecting Trip iReport

I’m back home after my week-long collecting trip to western Oklahoma, and at the risk of sounding hyperbolous I can only describe it as one of the most successful collecting trips I’ve ever had. Seriously! These kinds of trips don’t happen all that often for a variety of reasons—timing is off, rains didn’t happen, weather was uncooperative, etc. etc. Once in a while, though, everything comes together, and this was one of those times. The trip was also a return to my roots so to speak—I’ve been rather distracted in recent years with tiger beetles, but jewel beetles (family Buprestidae) and, to a lesser extent longhorned beetles (family Cerambycidae), are really the primary focus of my taxonomic studies. It had been several years since I’d had a good “jewel beetle trip,” so that was the focus of this trip. In planning the trip, I recalled seeing jewel beetle workings in several woody plant species in the same area during last September’s trip, and the occurrence of May rains seemed to bode well for my early June timing.

Gloss Mountains State Park, Major Co., Oklahoma

Gloss Mountains State Park, Major Co., Oklahoma

My instincts proved to be justified—in seven days in the field I collected an estimated 1000–1500 specimens representing at least two dozen species of Buprestidae and a dozen or more Cerambycidae. More important than the numbers, I collected a number of species in good series that I have either not or only rarely collected before, and in fact the second beetle that I collected turned out to be a new state record! Of course, I also brought along my full-sized camera and associated gear and photographed many of the species that I collected. I will feature these photos in future posts, but for this post I thought it might be fun to give a high level view of the trip illustrated only with photos taken with my iPhone (which I also carry religiously in the field with me). The iPhone is great for quick snaps of scenery and miscellaneous plants and animals for which I don’t feel like breaking out the big camera, or as a prelude to the big camera for something I’d like to share right away on Facebook. Moreover, there are some types of photos (landscapes and wide-angles) that iPhones actually do quite well (as long as there is sufficient light!).

Gloss Mountains State Park, Major Co., Oklahoma

Atop the main mesa at Gloss Mountains State Park, Major Co., Oklahoma

My first destination was Gloss Mountains State Park (Major Co.), a stunning system of gypsum-capped, red-clay mesas. I’ve already found a number of rare tiger beetles here such as Cylindera celeripes (Swift Tiger Beetle), Amblycheila cylindriformis (Great Plains Giant Tiger Beetle) and Dromochorus pruinina (Frosted Dromo Tiger Beetle), and in the past two falls I’ve found two interesting jewel beetle records: Chrysobothris octocola as a new state record, and Acmaeodera macra as a northern range extension. On this trip, I started out beating the mesquite  (Prosopis glandulosa) and immediately got the longhorned beetle Plionoma suturalis—a new state record! They were super abundant on the mesquite, and I collected several dozen specimens along with numerous C. octocola as well. I then moved over to the red-cedar (Juniperus virginiana), which was showing a high incidence of branch dieback, and collected nice series of several buprestids, including what I believe to be Chrysobothis ignicollis and C. texanus. Up on top of the mesa there are small stands of hackberry (Celtis laevigata) and soapberry (Sapindus saponaria), both of which are very good hosts for Buprestidae. Not much was on the soapberry, but I beat large series of several Buprestidae from the hackberry, including what I believe to be Chrysobothris caddo and—the real prize—Paratyndaris prosopis! My old friend C. celeripes was also out in abundance, so I collected a series to add to my previous vouchers from this site. Back down below, I marveled at a juvenile western diamondback rattlesnake (Crotalus atrox) in the area where I found some more A. cylindriformis larval burrows. Daylight ran out before I could dig them up, and after 11 hours in the field I was exhausted, so I returned the next morning and got one 1st- and two 3rd-instar larvae and went back up on top of the mesa and beat several more P. prosopis from the hackberry.

Bullsnake (Pituophis catenifer sayi) | Alabaster Cavern State Park, Woodward Co., Oklahoma

Bullsnake (Pituophis catenifer sayi) | Alabaster Cavern State Park, Woodward Co., Oklahoma

My second stop was at Alabaster Cavern State Park (Woodward Co.), where C. celeripes was again abundant on the gypsum-clay exposures surrounding an impressive gorge thought to be a collapsed cave complex. I focused on beating hackberry because of the success with buprestids on this plant at Gloss Mountains SP, and although they were not quite as abundant here as at Gloss Mountains I still managed to end up with good series of C. caddo and several species of Agrilus. Because I had spent the morning at Gloss Mountains, I had only a partial day to explore Alabaster Caverns and, still getting used to the weight of the camera bag on my back, decided to leave the big camera in the car. This was a mistake, as I encountered my first ever bullsnake (Pituophis catenifer sayi) and had to settle for iPhone photos of this species—the photo above being the best of the bunch. An approaching storm put an end to my second day after another 10 hours in the field, and I drove an hour to Woodward.

Moneilema sp. on Opuntia phaecantha | Alabaster Cavern State Park, Woodward Co., Oklahoma

Moneilema sp. on Opuntia macrorhiza | Alabaster Cavern State Park, Woodward Co., Oklahoma

My third day started out at nearby Boiling Springs State Park, a riparian oasis on sandy alluvium alongside the nearby Cimarron River. The woodlands are dominated by hackberry and American elm, and although a few buprestids were beaten from hackberry and honey locust (Gleditisia triacanthos), the numbers and diversity were not enough to hold my interest in the spot. After lunch, I decided to return to Alabaster Caverns SP and explore some other areas I had not had a chance to explore during the previous partial day. It’s a good thing that I did, as I ended up finding a nice population of longhorned cactus beetles in the genus Moneilema associated with prickly pear cactus (Opuntia macrorhiza). I collected a nice series of adults and also learned a few lessons in how to photograph these beetles on their viciously protective host plants. The photo above gives a taste of what will come in the photos that I took with the big camera. After eight hours in the field and darkness falling, I drove two hours to Forgan in Beaver Co.

Beaver Dunes State Park, Beaver Co., Oklahoma

Beaver Dunes State Park, Beaver Co., Oklahoma

Day 4 in the field started out cold and ominous, having stormed heavily during the previous night and with thick clouds still hanging in the sky. I feared the day might be a wash but decided to venture to Beaver Dunes State Park anyway and take my chances (beating can still be productive even in cold weather as long as the foliage is not wet). It’s a good thing that I did, as the buprestids were as numerous as I’ve ever seen them. The park’s central feature is a system of barren sand dunes that are frequented by ORV enthusiasts and surrounded by hackberry woodlands. The park also has a reservoir and campground, around which are growing a number of cottonwoods (Populus deltoides).

Hackberry Bend Campground, Beaver Dunes State Park, Beaver Co., Oklahoma

Hackberry Bend Campground, Beaver Dunes State Park, Beaver Co., Oklahoma

These hackberrys and cottonwoods proved to be extraordinarily productive. On the former I collected large series of several species of Chrysobothris and Agrilus, and while I collected fewer Buprestidae on the latter, these included Agrilus quadriguttatus and Poecilonota cyanipes! The latter species I had never collected until last year (from Cerceris fumipennis wasps), and beating the lower branches of the declining cottonwoods produced a series of about a dozen specimens. I also got one specimen on black willow (Salix nigra), along with a few Chrysobothris sp. and what I take to be Agrilus politus. Also in a low branch of one of the cottonwoods was a bird’s nest with a single egg that, according to Facebook comments, either represents the American Robin or a Gray Catbird. (I returned the next day and saw two eggs in the same nest.)

American Robin or Gray Catbird nest w/ egg | Beaver Dunes State Park, Beaver Co., Oklahoma

American Robin or Gray Catbird nest w/ egg | Beaver Dunes State Park, Beaver Co., Oklahoma

As the day drew to a close, I found two interesting longhorned beetle species at the edge of the dunes: one large, powdery gray Tetraopes sp. on milkweed (Asclepias sp.), and huge numbers of Batyle ignicollis evidently perched on the yellow spiked inflorescence of an as yet undetermined plant. I have seen this species on many occasions, but always in low numbers, yet here were literally hundreds of individuals on the plants, all having assumed a characteristic pose on the inflorescence suggesting that they had bedded down for the night. I only spent eight hours in the field on this day because of the late start, and as darkness approached I began the two-hour drive to Boise City.

Black Mesa landscape

Sculpted sandstone landscape in the vicinity of Black Mesa State Park, Cimarron Co., Oklahoma

The final two days in the field were supposed to be spent exploring the area around Black Mesa in the extreme northwest corner of Oklahoma, and another hour of driving was needed to get to the area from Boise City. I first went to Black Mesa State Park, and while the landscape was stunning (see above) the area was extremely dry. I feared the collecting would not be at all productive in this area but wanted to give the area a good effort before making a call. As I approached the entrance to the park, I saw a jeep parked by the side of the road with a license plate that read “Schinia,” which I recognized as a genus of noctuid moths that are very popular with collectors. I pulled over and talked to the driver, who was indeed a lepidopterist from Denver and had just arrived himself. We talked and exchanged contact information, and learning of my interest in beetles he directed me to a small stand of Gambel oak (Quercus gambelii) and one-seed juniper (Juniperus monosperma) on a sculpted sandstone escarpment not far from the park. I found the spot, and although I beat three Chrysobothris sp. from the first juniper tree that I whacked, another hour of beating produced only one more beetle from the juniper and nothing from the oak. I returned to the spot where we had met and encountered him again on his way out! We stopped and chatted again and found a few specimens of what I take to be Typocerus confluens on the yellow asters, but by then I was having my doubts about staying in the area. I told him I was going to check out a ravine in the park and then decide.

Petrified forest | Black Mesa State Park, Cimarron Co., Oklahoma

Petrified forest | Black Mesa State Park, Cimarron Co., Oklahoma

The petrified forest ended up being the only interesting thing I found in the ravine—the area was so dry that I think even the real trees were almost petrified! At any rate, it was clear that I was not going to have much success in this area. I looked at my watch, knowing that it would take three hours to drive back to Beaver Dunes, and estimated that if I left now I could get in about three hours of collecting at Beaver Dunes where I’d had so much success the previous day. Thus, I did what I rarely do on a collecting trip—drive during the afternoon!

Beaver Dune

The main dune at Beaver Dunes State Park, Beaver Co., Oklahoma.

A chunky grasshopper nymph inhabiting the dune

A chunky grasshopper nymph inhabiting the main dune.

I arrived back at Beaver Dunes with several hours of daylight still remaining, so I decided to take a look around the main dunes before heading towards the woody plants. I’ve actually visited Beaver Dunes previously, on the tail end of a fall tiger beetle trip in 2011. At that time I had seen only the rather common and widespread species Cicindela formosa (Big Sand Tiger Beetle) and C. scutellaris (Festive Tiger Beetle), but I thought there could still be a chance to see the much less common C. lengi (Blowout Tiger Beetle). Early June, however, is a little late to see the spring tigers, and in fact I saw only a single C. formosa. Nevertheless, I find dune habitats irresistible—alien habitats occupied by strange plants and animals, and I spent a bit of time exploring the main dune before heading back towards where I had collected so many Buprestidae the previous day.

Low water levels in the reservoir at Beaver Dunes are a result of three years of drought.

Low water levels in the reservoir at Beaver Dunes are a result of three years of drought.

Western Oklahoma, like many parts of the central U.S., has suffered rather severe drought conditions for the past several years. This was evident not only in the large amount of branch dieback seen in the woody vegetation of the area (and probably a contributor to my success at collecting Buprestidae) but also the very low water level in the park reservoir. In the photo above the small cottonwood saplings in the foreground and large cottonwood trees in the left background indicate the normal water level. Cottonwoods, of course, like to keep their feet wet, and the trees around this reservoir—left high and dry by the drought—have responded with major branch dieback and lots of subsequent adventitious sprouting at the bases of the main branches. It was from this adventitious growth that I had beaten most of the Poecilonota cyanipes that I collected the previous day, so I repeated the cottonwood circuit in the hopes of collecting more. Not only did I collect more, but I collected twice as many as the previous day, so I ended up with a very nice series of more than two dozen individuals of the species from the two days collecting. I also did a little more beating of the hackberry trees which had produced well the previous day and collected several more Chrysobothris caddoC. purpureovittata, and Agrilus spp. such as A. leconteiA. paracelti, and perhaps others. When I arrived I was unsure whether I would stay here the following day, but eventually I decided I had sampled the area about as well as I could and that I would go back to the Gloss Mountains for my last day in Oklahoma. Thus, as the day began to wane I began hiking back to the car and spent the next two hours driving back to Woodward to spend the night.

Steep slope below the main mesa | Gloss Mountains State Park, Major Co., Oklahoma

Steep slope below the main mesa | Gloss Mountains State Park, Major Co., Oklahoma

Echinocereus sp. | Gloss Mountains State Park, Major Co., Oklahoma

Echinocereus sp. | Gloss Mountains State Park, Major Co., Oklahoma

Arriving at the Gloss Mountains the next morning was like coming home! I’ve spent so much time at this place and found so many great insects, yet every time I come here I find something new. Today, however, my goals were more modest—I wanted to improve on my series of Paratyndaris prosopis and Chrysobothris texanus, so I focused most of my time beating the hackberry and juniper on top of the mesa and continued beating the juniper down below as well. Success! I collected four more Paratyndaris off of the hackberry, but the C. texanus were far more abundant on this day than they were earlier in the week—I probably got another two dozen individuals of this species. Of course, I also got distracted taking photographs of a number of things, so the day went far more quickly than I realized. I wanted to leave around 6 pm and get in about three hours of driving so that I would have time to make it into Missouri the next morning and have a nice chunk of time to collect before finishing the drive and arriving home on Saturday night. It was actually closer to 7:30 pm before I hit the road, the reason for the delay being the subject of a future post (I will say that BioQuip’s extendable net handle comes in handy for much more than collecting tiger beetles!).

Dolomite glades | Hercules Glades Wilderness, Taney Co., Missouri

Dolomite glades | Hercules Glades Wilderness, Taney Co., Missouri

Long Creek | Hercules Glades Wilderness, Taney Co., Missouri

Long Creek | Hercules Glades Wilderness, Taney Co., Missouri

For my last day of collecting, I decided to stop by at one of my favorite spots in the White River Hills of extreme southwestern Missouri—Hercules Glades Wilderness in the Mark Twain National Forest. I’ve been to this place a number of times over the years, but in recent years my visits have usually been late in the season to look for the always thrilling to see Cicindelidia obsoleta vulturina (Prairie Tiger Beetle). It had actually been about 25 years since I’d visited these glades during the spring, and because of the success I’d had collecting in Oklahoma I was really optimistic that I would find the same here. Sadly (and inexplicably), insect activity was very low, and it didn’t take long for this to become apparent as branch after branch that I beat along the trail through the dry-mesic forest down to Long Creek yielded nothing. By the time I got to the creek I still had not collected a single beetle. A consolation prize was found along the creek, as beating the ninebark (Physocarpos opulifolius) produced a few specimens of the pretty little Dicerca pugionata, and a couple more consolation prizes were found further up the trail approaching the main glade when I saw a Cylindera unipunctata (One-spotted Tiger Beetle) run across the trail and then beat a single Agrilus fuscipennis from a small persimmon (Diospyros virginiana) tree at the edge of the glades. It had been about 25 years since I last collected the latter species, so I was very happy to see it, but no more were seen despite beating every persimmon tree that I saw during the rest of the day. At the end of the day, I had hiked seven miles and collected only six beetles—a rather inauspicious ending to what was otherwise a wonderfully successful trip.

A rare ''selfie''

The author takes a rare ”selfie” at Gloss Mountains State Park.

Arriving back at the car at the end of the day on the last day of an extended collecting trip is always a little depressing—despite the vagaries of travel, cheap hotel beds, meals on the go, and general exhaustion, I’m never happier than I am when I am in the field. Still, the success that I’d had during this trip did much to ease my depression, and arriving home late that night and seeing my girls again (who waited up for me!) finished off any remaining depression.

© Ted C. MacRae 2013

Meet Enus’ Meal

Phymatodes amoenus (Coleoptera: Cerambycidae) | Stoddard Co., Missouri

Phymatodes amoenus (Coleoptera: Cerambycidae) | Stoddard Co., Missouri

When Enus (Enoclerus ichneumoneus) was beaten from a dead grape vine in southeastern Missouri, he wasn’t alone. Along with him was this longhorned beetle representing Phymatodes amoenus (family Cerambycidae). Even though P. amoenus and E. ichneumoneus are both woodboring beetles, their association together on this dead grape vine was not purely coincidental. Phymatodes amoenus is associated exclusively with the genus Vitis (family Vitaceae), its larvae developing within the dead vines. Enoclerus ichneumoneus also bores through dead wood in the larval stage but is much less discriminating about the plant species. This is because E. ichneumoneus and most other checkered beetles (family Cleridae) don’t actually eat the wood within which they are tunneling, but rather prey upon the other woodboring beetle larvae that they encounter in the wood. The adult checkered beetles are thus attracted to dead wood not as a food source itself, but rather the woodboring larvae that will provide food for their offspring.

Phymatodes amoenus

Half an antenna and the left mesotarsus were the price to pay for rooming with Enus!

When I collected these two individuals, I put them together in a vial as I continued beating the vine to look for other individuals. None were found, but I had forgotten that adult checkered beetles also are predaceous. Needless to say, Enus found the cerambycid beetle to be easy pickings while they were confined together and managed to eat half of the cerambycid’s left antenna and left mesotarsus before I realized my oversight and rescued the poor thing.

Copyright © Ted C. MacRae 2013

Meet Enus

It may be quiet here at Beetles in the Bush for the next week or so while Ted is off in the far corners of Oklahoma looking for beetles to photograph and add to his collection. In the meantime, meet Enus (full name Enoclerus ichneumoneus), a checkered beetle who was beaten from a dead grapevine (Vitis sp.) in southeastern Missouri and who has promised Ted he will keep a close eye on things while Ted is away.

Enoclerus ichneumoneus | Stoddard Co., Missouri

Enoclerus ichneumoneus | Stoddard Co., Missouri

Beetles in Oklahoma had better watch out!

© Ted C. MacRae 2013

North America’s itsiest bitsiest longhorned beetle

Longhorned beetles (family Cerambycidae) are generally regarded as medium to large-sized beetles, but that doesn’t mean the family is without its pip-squeeks! There are a number of species, primarily in the tribes Tillomorphini, Anaglyptini, and Clytini (all in the subfamily Cerambycinae) that are remarkably effective mimics of ants. Some of these, especially members of the genus Euderces, are quite small, but none are smaller than the absolutely diminutive Cyrtinus pygmaeus. Measuring only 2–3 millimeters in length, the adult beetles can be found on dead twigs and branches among equally small ants such as Lasius americanus.

Cyrtinus pygmaeus | Stoddard Co., Missouri

Cyrtinus pygmaeus | Stoddard Co., Missouri

The species is said to be widespread across eastern North America, having been recorded on a number of hardwood trees (Lingafelter 2007). I have no reason to doubt this, having reared a number of individuals from dead branches of river birch (Betula nigra), chinquapin oak (Quercus muhlenbergii), willow oak (Q. phellos) and black oak (Q. velutina) (MacRae & Rice 2007), but in the wild I have only encountered the species three times—each time as a single specimen that I noticed crawling on my arm after a bout of beating a variety of dead branches. The most recent occasion was two weekends ago during a visit to the Mississippi Lowlands of southeastern Missouri. I had done a bit of beating in a forest dominated by black oak, blackjack oak (Q. marilandica), and southern red oak (Q. falcata) and not found much when I felt a “tickle” on my right forearm. I looked down and was just about to flick the “ant” off my arm when something about the way it moved gave me pause. I stopped and looked closer, then recognizing what it was, instinctively called out “Oh cool, Cryrtinus pygmaeus!” My field partners for the day had never seen the species, so I let them look before I placed it in a vial. I was sure they would ogle at the incredibly tiny longhorned beetle, but their subdued “Hmm”s makes me think they were less impressed with the find than I was.

Cyrtinus pygmaeus

Like other ant-mimicking genera, the elytra of this species bear two prominent humps near their bases.

If the species is so common, why have I not seen them more commonly or on the beating sheet proper as soon as I beat them from their host plant? The answer, I believe, is that they are such effective mimics of the tiniest of ants that I simply overlook them! The series of specimens retrieved from my rearing cans could not be missed, as I combed through the contents every week during the beetle emergence period to make sure I found anything—longhorned beetle or otherwise—that emerged from the wood inside. In the field, however, my search image is queued for more “normal-sized” beetles and especially movement. Most other ant-mimicking longhorned beetles, even though they look very much like ants, still run like longhorned beetles—swiftly, almost frenetically, looking for the earliest opportunity to spread their elytra and take wing. Cyrtinus pygmaeus, on the other hand, is slow and clumsy, not a runner at all (slower even than the ants they mimic). If the three individuals I’ve encountered in the wild to date hadn’t happened to fall on my arm rather than the beating sheet and gotten stuck in my hair and perspiration I may never have noticed them.

Cyrtinus pygmaeus

Bands of white pubescence on the bases of the elytra give the illusion of a narrow-waisted ant.

I considered putting the beetle on a branch for photographs as soon as I found it, but since I had already pulled it off my arm I had already lost the chance to take true field photographs. Instead, I placed the beetle live in a vial and photographed it the next day at home. All of the photos were taken hand-held with an MP-E 65 mm macro lens at the upper end of its magnification capabilities. The green background is simply a colored file folder placed about four inches behind the beetle as I photographed it.

p.s. can you tell me what unusual feature this particular individual exhibits?

REFERENCES:

Lingafelter, S. W. 2007. Illustrated Key to the Longhorned Woodboring Beetles of the Eastern United States. Coleopterists Society Miscellaneous Publications, Special Publication No. 3, 206 pp.

MacRae, T. C. and M. E. Rice. 2007. Distributional and biological observations on North American Cerambycidae (Coleoptera). The Coleopterists Bulletin 61(2): 227–263.

Copyright © Ted C. MacRae 2013

Field photographs of insects can be deceiving

My previous post featured several photos of Cicindela formosa generosa (Eastern Big Sand Tiger Beetle). This gorgeous beetle is said to occur in open, dry sand habitats throughout the Great Plains and more sporadically across the north-central and northeastern U.S. Like most other existing photos of this species, they show adults on barren sand with not so much as a sprig of vegetation to be seen. As a result, one might presume that adult beetles prefer the most open and barren areas of the habitats in which they occur.

"You don't see me, but I see  you!"

“You don’t see me, but I see you!”

Consider the above photo—taken the same day as those in the previous post but annoyingly cluttered with vegetation that partially obstructs the view of the beetle. This was actually the first photograph that I took that day, and while the foliage may be considered an aesthetic distraction, it nevertheless provides valuable information about the natural history of the beetle. My impression from the past few years of observation is that adult beetles actually spend more time foraging in the sparsely vegetated areas surrounding these more open areas. I presume they are more likely to encounter prey in areas where some vegetation exists, and also the vegetation provides opportunities for shade, which the adults actively seek out during the hottest parts of the day. Most collectors and photographers do not notice beetles foraging amongst the vegetation, but instead see them only after their approach has caused the beetle to flee out into the more open areas—where they are then collected/photographed.

© Ted C. MacRae 2013

Big, Bold and Beautiful—Redux

Cicindela formosa generosa | Scott Co., Missouri

Cicindela formosa generosa (Eastern Big Sand Tiger Beetle) | Scott Co., Missouri

Strange as it may seem to residents of the western U.S. or coastal areas in the east, one of my favorite sights in Missouri is dry sand! It’s a true rarity in our limestone/dolomite dominated state, a result of nearly continuously exposed land for the past several hundred million years. Only along the state’s bigger rivers, where relatively recent alluvial events have yet to be completely eroded by the passage of time, can significant sand deposits be found. It is in these habitats that one of my favorite of Missouri’s tiger beetles, Cicindela formosa generosa (Eastern Big Sand Tiger Beetle), can be found. In much of the state, tiny slivers of sand dry enough to support populations of these beetles occur sporadically along the Missouri and Mississippi Rivers and their larger tributaries. More extensive deposits, however, are found in several wide, low ridges of sand in the southeastern lowlands of the state—relatively recent alluvial deposits from the last glacial maximum. Sadly, in a region originally blanketed by tupelo/gum/cypress swamp, such relatively dry areas were the first to fall to the plow, and subsequent drainage of the surrounding swamps further promoted a near complete  conversion of the entire region to agriculture.

She's got legs up to her neck!

She’s got legs up to her neck!

Still, tiny remnants of original habitat remain—generally parcels of land that were either too dry and sandy or persistently undrainable. Such parcels now form the basis of Missouri’s system of preserves in southeast Missouri. As tiny as they are and representing only a few percent of their original extent, these parcels now serve a critical role in preserving some of Missouri’s most endangered natural communities. Among these is Sand Prairie Conservation Area in Scott Co., featured several times now on this blog (). The sand here is extraordinarily dry, due not only to its depth but also the low organic content—factors that made the land unfarmable and, ultimately, allowed it to escape the conversion that befell the surrounding areas and eventually become a preserve. I have visited Sand Prairie many times in recent years, and although I now know its plants and animals well, there are some that I never tire of seeing—plants like clasping milkweed (Asclepias amplexicaulis), one of my favorite of Missouri’s milkweeds, and animals like C. formosa generosa!

Bold white markings and a chunky body make this one of Missouri's most distinctive tiger beetles.

Bold white markings and a chunky body make this one of Missouri’s most distinctive tiger beetles.

Last weekend I visited Sand Prairie once again, and I was happy to see C. formosa generosa as plentiful as I have ever seen it. I have photographed this species on several occasions, most recently two years ago at a site very near my house. Those last photographs are probably as good as I can ever expect (and in fact one of them even made this year’s ESA calendar), so barring some unusual color form or interesting natural history observation I have little reason to continue taking photographs of it. Nevertheless, I’m trying out a new diffuser, which was all the excuse I needed to try my hand again with this big, beautiful species. I was once again reminded of why of I love this tiger beetle so much—their bulk, their bulging eyes, their long, looping escape flights that end with a comical bounce and tumble, only to end up on their feet and facing their pursuer. These beetles are loaded with personality and behavioral charisma. It was an unseasonably warm and humid day, so my opportunities to photograph them were limited. I hope these few that I present here impart some of that personality.

Individuals from Missouri often show a hint of the red coloration that characterizes populations further west.

Missouri individuals often show a hint of the red coloration that characterizes populations further west.

Copyright © Ted C. MacRae 2013

Oversized, double-concave diffuser for MT-24EX twin flash

IMG_2865_enh_1080X720

Megaloxantha bicolor palawanica, photographed with oversized, double-concave diffuser

This jewel beetle is, of course, Megaloxantha bicolor palawanica me beetle on several occasions while testing out different diffuser designs for my Canon MT-24EX twin flash unit. In the most recent one, I had tried combining SoftBoxes with my oversized concave diffuser and was pleased enough with the result that I thought I might try it in the field. Well, let’s just say the extensions for the flash heads and SoftBoxes attached to them was far too clumsy for field use, and I abandoned the idea after just a couple of hours. Back to the drawing board.

Despite the problems with using the SoftBoxes in the field, I still wasn’t ready to give up on the idea of double diffusion, and I had also learned that extending my oversized diffuser out over the subject (leaving it “open”) produced better lighting than curling it back (as I had been doing). Curling the diffuser back only served to turn it into a convex diffuser, which results in more specular highlighting because the center of the diffuser is closer to the subject than the edges. A concave diffuser provides more even lighting because all parts of the diffuser are roughly the same distance from the subject. Just about that time, I saw a DIY diffuser design by Piotr Nascrecki that, in principle, resembled Alex Wild‘s tent diffuser. It was, however, much larger—like mine, and thus amenable for use with a 100mm macro lens (the macro lens I use most commonly). This resemblance to Alex’s diffuser did make me notice one missing feature—double diffusion layers. That’s when I thought, why not do the same with an oversized diffuser rather than fussing with separate diffusers attached to the flash heads? I had some Bogen Imaging filter sheets on hand (#129 Heavy Frost), so I picked up some 1-mm steel wire at the hardware store, found a Bic pen in the drawer that I could cut in half, and built the diffuser as shown in Piotr’s post. I then secured a second filter sheet above the first sheet by taping the two together along their sides, being sure to ‘bow’ the upper sheet above the bottom sheet to achieve the double diffusion effect. Here is the result (please excuse the iPhone shots):

Oversized double diffuser for Canon MT-24EX twin flash.

Canon 50D with MT-24EX twin flash and oversized, double-concave diffuser.

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Better view of the double diffusion layers and Piotr’s “Bic pen” attachment system.

I have big hopes that this will finally be the diffuser I’ve been looking for. For as quick a test shot as the jewel beetle photo above was, the lighting is great and the colors are vibrant—both achieved with typical post-processing. My only complaint is the slightly greater “hot spot” intensity in the lower parts of the highlights in the eyes. This is due to the flash heads sitting near the base of the diffuser, and (as Piotr recommends) a second set of Kaiser shoes will allow me to move the flash heads not only more towards the center of the diffuser but also further above it to help spread out the light throw and even out the highlights. I’ll need to play around positioning the flashes to figure out the best positions depending on the size and distance of the subject—sitting up higher as they are puts them more on “top” than in “front” of the subject, so they will need to be directed downward more than I am used to doing. Even more important, however, is field usability, and I really think this diffuser will prove to be convenient and easy to use in the field—no more gawky arms attached to the camera, the diffuser attaching quickly and easily and, just as importantly, coming off easily and storing flat in the backpack, and large enough to do the job while not so oversized that it gets in the way. Piotr says this diffuser also works well with the 65mm macro lens, so I will certainly be testing that out as well.

Copyright © Ted C. MacRae 2013

Group mimicry in Cerambycidae… and more

During last year’s extended visit to Argentina, I had the chance to spend the early part of April in the northern province of Chaco. Though much of this hot, arid plain has been converted to agriculture, remnants of thorn forest remain along fence rows and in small patches of Chaco Forest. Despite the decidedly tropical latitude of the region, however, the profuse bloom of Chilean goldenrod, Solidago chilensis, along these fence rows during the Argentine autumn is reminiscent of crisp fall days here in the eastern U.S., and like the goldenrod here the ubiquitous stands of yellow blossoms stretching across the Chaco Plain are equally attractive to a multitude of insects. Among those insects are the Cerambycidae, or longhorned beetles, and while the eastern U.S. cerambycid fauna of goldenrod boasts only a few (albeit spectacular) species in the genus Megacyllene, the Argentine cerambycid fauna that I found on these flowers included at least three species in various genera belonging to two different tribes.

Rhopalophora collaris (Germar 1824) | Chaco Province, Argentina

Rhopalophora collaris (Germar 1824) | Chaco Province, Argentina

Two of the species I saw are shown here, and their similarity of appearance is no coincidence, as both belong to the tribe Rhopalophorini (coming from the Greek words rhopalon = club and phero = to bear, in reference to the distinctly clavate, or club-shaped, legs exhibited by nearly all members of the tribe). In fact, a great many species in this tribe exhibit the same general facies—slender in form and black in coloration with the head and/or pronotum red to some degree. Since all of these species are diurnal (active during the day) and frequently found on flowers, one can assume that the members of this tribe represent an example of what Linsley (1959) called ‘group mimicry.’ In this simple form of Batesian mimicry (harmless mimic with protected model), a group of related species within a genus or even a tribe have a general but nonspecific resemblance to those of some other group of insects—in this case presumably small, flower-visiting wasps. Although the tribe is largely Neotropical, the nominate genus Rhopalophora does extend northward with one eastern U.S. representative, R. longipes. Among the numerous species occurring in South America, the individuals I saw in Argentina can be placed as R. collaris due to the relative lengths of their antennal segments and uniquely shaped pronotum (Napp 2009).

Cosmisoma brullei (Mulsant 1863) | Chaco Province, Argentina

Cosmisoma brullei (Mulsant 1863) | Chaco Province, Argentina

The second species could easily be mistaken for another species of Rhopalophora were it not for the distinct tufts of hair surrounding the middle of the antennae. These tufts immediately identify the beetle as a member of the large, strictly Neotropical genus Cosmisoma (derived from the Greek words kosmos = ornament and soma = body, a direct reference to the tufts adorning the antennae of all members of this genus). Three species of the largely Brazilian genus are known from Argentina, with the black and red coloration of this individual easily identifying it as C. brullei (Bezark 2o13). In the years since this genus was described, additional related genera have been described that bear remarkably similar tufts of hair not on the antennae, but on the elongated hind legs. The great, 19th century naturalist Henry Walter Bates “tried in vain to discover the use of these curious brush-like decorations” (Bates 1863), and nearly a century later Linsley (1959) conceded that their function still remained unknown. Antennal tufts are actually quite common in Cerambycidae, especially in Australia, and while experimental evidence continues (to my knowledge) to be completely lacking, Belt (2004) records observing “Coremia hirtipes” (a synonym of C. plumipes) flourishing its leg tufts in the air (presumably in a manner similar to waving of antennae) and, thus, giving the impression of two black flies hovering above the branch on which the beetle was sitting. This seems also to suggest a function in defense, with the tufts perhaps serving as a distraction to potential predators in much the same way that many butterflies have bright spots near the tail to draw the predator’s attention away from the head.

REFERENCES:

Bates, H. W. 1863. The Naturalist on the River Amazons. Murray, London, 2 vols.

Belt, T. 2004. The Naturalist in Nicaragua. Project Guttenberg eBook.

Bezark, L. G. 2009. A Photographic Catalogue of the Cerambycidae of the World. Available at http://plant.cdfa.ca.gov/byciddb/

Linsley, E. G. 1959. Ecology of Cerambycidae. Annual Review of Entomology 4:99–138.

Napp, D. S. 2009. Revisão das espécies sul-americanas de Rhopalophora (Coleoptera: Cerambycidae). Zoologia (Curitiba) 26(2):343–356.

Copyright © Ted C. MacRae 2013