Keep sending in your photos, folks! Today we’ll finish up with the second installment of Mark Sturtevant’s insect photos (first bit here). Mark’s notes are indented:
I generally don’t take more pictures of insects after they are well documented in my portfolio, but the jewel wing damselflies are among the exceptions to that informal policy. Besides being very beautiful, I enjoy the challenges that they present. They are shade-loving, which presses me to use the flash, but their metallic colors tend to not come out well with the flash, so I have been trying a variety of experiments to get the right effect. This summer I learned that I can sometimes get a true representation of their colors by bouncing the flash up from the ground or down from the canopy.
This picture shows a female ebony jewel wing (Calopteryx maculata). As one can see they are a bit duller in color [compare to male in previous installment], and they have white stigmata on their wings. When getting pictures of this one I was lying flat on my stomach. After a time she nipped out, grabbed a small moth, and returned to her perch with her meal stuffed into her surprisingly capacious mouth.
Next is a very large ladybug larva, probably belonging to the giant fifteen-spotted ladybug (Anatis labiculata). This one was grazing on a colony of leaf beetle larvae. I was a bit surprised to see this since I thought of ladybugs as aphid predators, but they clearly do not care what I think. The leaf beetle larvae seem to be using excrement as camouflage. So, eww.
Next is a longhorn beetle, the elm borer (Saperda tridentata). Although the adults are rather pretty, the larvae can do serious damage to elm trees as they bore extensive galleries under the tree bark.
Nearing the end, the next picture is what certainly looks like a caterpillar but in fact it is the larva of a sawfly wasp, probably in the genus Abia. One difference between sawfly larvae and caterpillars is that the former has abdominal ‘prolegs’ on pretty much every segment of the abdomen, but lepidoptera larvae would have two or more segments without prolegs. Their resemblance to caterpillars is an example of convergent evolution, since like caterpillars they crawl around on leaves and branches, eating the foliage.
The final two pictures feature the long-jawed orbweaver, possibly Tetragnatha elongata, or T. versicolor. The color patterns are a bit variable, and it can be difficult to really be sure. In any case, these largish, semi-communal spiders are commonly seen hanging along branches over water. Long-jawed orbweavers look pretty scary with their oversized chelicerae and fangs, but they are handled easily. According to some pictures I have seen, the big chompers are for clasping between males and females.
The first picture is a female, and the second picture shows a male. I had quite a time trying to get the latter picture since he simply would not sit still in the field. I resorted to bringing him home for a staged shot while isolated on a stick in my back yard. But he would have none of it. The male immediately ran up to the top of the stick and posted his abdomen into the air while waving his back legs. I barely had time to realize what he was up to when he suddenly flew away, making a beeline through the air for a nearby tree canopy! The crafty little bugger had sent out an airborne dragline into the breeze, and waited for it to catch onto something before making his get-away along it. I intercepted him just before he was out of reach and returned him to his perch. Seconds later, off he went again! So I had to bring him indoors for pictures where there was no breeze. But even then he was a complete pain in the *ss and the entire process was pretty exhausting. I have developed considerable admiration for this challenging spider, and I would like to return to this group again to try to get pictures that show off their ‘flying’ talent. But since they are good at it, I expect I will need to collect several of them to replace the escapees.