Archive

insects

This little, though long deceased beauty is Elaphrus ruscarius, a member of the family Carabidae. Species in this genus resemble cicindelids, though smaller in size and with ornate “pits” on the elytra rather than maculations.

elaphrus

Photo created with a Canon EOS 30D camera, MP-E 65mm f/2.8 1-5x macro lens, and MR-14EX macro ring flash with a homemade diffuser. A series of images was captured and merged in CombineZM and adjusted in Photoshop.

To anyone actually reading this blog (what?!), sorry for the delay between posts lately

Another species commonly found while peeling bark is the brightly colored Cucujus clavipes. Its flattened body is adapted for life in the tight space under loose bark. They are thought to feed on mites and small insects but relatively little is known about their biology otherwise. 

Cucujus clavipes

The larvae of C. clavipes are similarly flattened, though not as vividly colored, are instead a light shade of orange. 

Cucujus clavipes larva

Any collector of insects or similar fauna is familiar with the thrill of coming across a new or rare find – even old familiar species on occasion. Few beetles which reside under bark rarely provoke such a visceral reaction, but something about the loud color and unusual shape of C. clavipes always elicits that sudden jolt of excitement, particularly in the often bleak winter months.

For more information, check out the BugGuide page, American Beetles description of the family, the Cedar Creek NHA website, and this page on the family.

Additionally, here is an interesting article on the freezing tolerance of Cucujus clavipes

Not to add to the massive avalanche of stories on Charles Darwin, but today is the 200th anniversary of his birth – and Abraham Lincoln as well.

The most intriguing aspect of Darwin, at least to me, was his interest in beetles. Art Evans has a good post covering Darwin’s beetle adventures – take a look for a more in depth treatment of the topic; however, I will let Charles speak for himself…

From the small size of insects, we are apt to undervalue their appearance. If we could imagine a male Chalcosoma, with its polished bronzed coat of mail, and its vast complex horns, magnified to the size of a horse, or even of a dog, it would be one of the most imposing animals in the world. (The Descent of Man)

But no pursuit at Cambridge was followed with nearly so much eagerness or gave me so much pleasure as collecting beetles. It was the mere passion for collecting, for I did not dissect them, and rarely compared their external characters with published descriptions, but got them named anyhow. I will give a proof of my zeal: one day, on tearing off some old bark, I saw two rare beetles, and seized one in each hand; then I saw a third and new kind, which I could not bear to lose, so that I popped the one which I held in my right hand into my mouth. Alas! it ejected some intensely acrid fluid, which burnt my tongue so that I was forced to spit the beetle out, which was lost, as was the third one. (Autobiography)

I was introduced to entomology by my second cousin W. Darwin Fox, a clever and most pleasant man, who was then at Christ’s College, and with whom I became extremely intimate. Afterwards I became well acquainted, and went out collecting, with Albert Way of Trinity, who in after years became a well-known archaeologist; also with H. Thompson of the same College, afterwards a leading agriculturist, chairman of a great railway, and Member of Parliament. It seems therefore that a taste for collecting beetles is some indication of future success in life! (Autobiography)

I feel like an old war-horse at the sound of the trumpet, when I read about the capturing of rare beetles— is not this a magnanimous simile for a decayed entomologist. It really almost makes me long to begin collecting again. (Private Letter)

Anyone who has peeled bark in the search of many-legged quarry will probably be familiar with the diminutive (only 2-3 mm long) yet distinctive Mioptachys flavicauda. With elytra tipped with striking golden-yellow, antennae and legs a similar translucent golden hue, and head and thorax a deep glossy brown/black, resembles a bit of detritus, easily overlooked except when it is moving. Fortunately, M. flavicauda is seldom still, almost perpetually on the move when not safely under bark.

Mioptachys flavicauda

Photographing M. flavicauda is quite challenging – the best chance is when the beetle is on a light background with plenty of space to move and few crevices to escape into. This shot was taken a couple of days ago when the weather was near 50°F so I had a slight advantage due to the temperature.

More Information, Image, Bugguide page, Ground Beetles of Maine

I recently decided to “digitize” some of my moth collection. However, my Canon EOS 30D could not capture the level of resolution I was looking for.

Inspired by Joseph Scheer’s “Night Visions: The Secret Designs of Moths,” I thought I’d try to scan my specimens. My first several attempts were less then satisfactory so off to Google through which I found Jim des Rivières website, which includes a page on the techniques. With this information and some more fiddling the parts started to come together. The main point was to adjust the setting to insure that there was no clipping, at least of the highlights, since I was aiming for a black background.

At last the moment of truth; scanning the specimen at 4800 dpi. The first scan was rather useless since one of the wings had not lain flat, so I had to weight down the wings. After this minor snag and some time, the scanning was finished. The files ranged between 1.73 gb and 367 mb so editing took some time. After the usual post processing (straightening, a bit of contrast adjustment and some sharpening), I created quarter sized copies of the individual moths and stitched them all together, though not in any particular order.

Here is the final, though heavily reduced, image:

moth-scans-blog

To give an idea of the actual resolution here is a 100% crop from the full sized scan:

4800-dpi-blog

 Further information:

NY Times article on Joseph Scheer’s work; an interview with Scheer; or an excerpt from a Nat’l Geographic article

While my blog posts have been a bit sparse due to school, Bug Girl has been busy combating a recent spate of shoddy reporting on Cochineal, its safety, and  use in food and other products, such as makeup. Here is a link to her post on the subject. Very interesting stuff!

described as “the ultimate in recycling” by Thomas Eisner, fecal shields are probably the most unique method of insect self defense – used by beetles family Chrysomelidae, commonly known as leaf beetles.

I found this larva with a particularly ornate example feeding on some type of morning glory back in August 

img_8608

img_8625

img_86533

For more information and examples see here, and here

I found this very tiny beetle (the scale is .5mm) while I was trying to get a shot of some springtails on a piece of fungus.

a2

small beetle

It was not too had to get a shot even though I was shooting at 5x, mainly because the beetle was  not perturbed by my camera and went on about its business.

This strange little insect is a mantidfly, Zeugomantispa minuta – only the second one I’ve found.

While it may look like a mantis, it is actually in a completely different order, Neuroptera.

Like other mantidflies the larva of this species are parasitoids of spider egg sacs (an interesting article on this topic).