Tag Archives: hildacy farm

Snow midge with yellow halteres

Here’s a snow midge I found a few days ago at Hildacy Farm Preserve. I’m not positive about the species, but perhaps Diamesa nivoriunda. I only saw one, but related members of the genus are reported to swarm during the winter. 

What I’d love to know is why the halteres are yellow. They seem to be yellow on majority of diptera I’ve seen, and I’ve never stumbled onto a paper discussing why that is. All I could find was the sentence “Haltere color is often used to distinguish between species” in a Drosophila book .” If you know of a paper, please send link ASAP. Am dying of curiosity.

 Colin Purrington Photography: Insects &emdash; Snow midge (Diamesa nivoriunda)

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Small winter stonefly

I was out looking for the elusive snow fly yesterday but found this, instead: an eastern stonefly (Allocapnia recta), a member of the Capniidae (small winter stoneflies). At least that’s what I think it is. Larvae are active during the winter, and adults can fly and mate even when temperature is in the teens. Pretty incredible to see them flitting around on a cold day when other insects cannot even move. At Hildacy Farm in Media, PA. Probably emerged from the nearby Crum Creek. 

Colin Purrington Photography: Insects &emdash; Eastern stonefly (Allocapnia recta) Colin Purrington Photography: Insects &emdash; Eastern stonefly (Allocapnia recta)

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Nursery web spiders (lots of them)

Here are some photographs of a nursery web spider (Pisaurina mira) along with approximately 75 newly hatched spiderlings. She guards the hatchlings until they are older. The adult was a thing of beauty, especially when viewed large so you can see the hairs. There was a red milkweed beetle head on a nearby leaf, and the plant itself was devoid of anything but spiders. Hunting spiders like this one probably don’t help monarch populations.

I’ve never seen them do it, but apparently the adults are completely comfortable on water, and can even submerge themselves if threatened. They’re related to fishing spiders, so that’s not a complete surprise.

Photographed at Natural Lands Trust’s Hildacy Farm Preserve in Media, Pennsylvania. I can’t find any information on whether this species is native to North America, other than finding it listed on invasive.org. The species also is distributed in western Europe.

Colin Purrington Photography: Spiders and ticks &emdash; Nursery web spider (Pisaurina mira)

Colin Purrington Photography: Spiders and ticks &emdash; Nursery web spider (Pisaurina mira) hatchlings on underside of milkweek leaf

Colin Purrington Photography: Spiders and ticks &emdash; Nursery web spider spiderlings on underside of milkweek leaf

 

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Hummingbird and snowberry clearwing moths

Here are some photographs of the hummingbird clearwing moth (Hemaris thysbe) and the snowberry clearwing moth (H. diffinis).

Colin Purrington Photography: Insects &emdash; Hummingbird and snowberry clearwing moths

Day-active, colorful moths are rare enough, but these take it to the next level in their uncanny mimicry of hummingbirds and bumblebees, respectively. The mimicry presumably protects them from being eaten by predators such as crab spiders, praying mantids, and birds. In addition to the obvious behavioral and morphological resemblance to hummingbirds and bumblebees, the moths also make a slight humming noise that completes the disguise. The noise could easily be an unavoidable consequence of hovering flight (approximately 30 beats/second), but I wouldn’t be at all surprised if their wings are rigged in some way to exaggerate the noise. I’d love to know the answer to that. My other burning question is why the hummingbird clearwing moth has clear wings at all … I would expect selection to favor individuals that did not lose scales, because such a mutant would more resemble a hummingbird, which has opaque wings. I’m guessing that reason is not because fully-scaled wings are too heavy — the hummingbird hawk moth (Macroglossum stellatarum) in the Old World has opaque wings and can manage 70-90 beats/second (wow). I wonder whether a fully scaled wing might damp the humming sound. All photographs were taken at Natural Lands Trust’s Hildacy Farm Preserve in Media, Pennsylvania. Oh, and happy National Moth Week.

Colin Purrington Photography: Insects &emdash; Hummingbird clearwing moth (Hemaris thysbe) with unfurling proboscis

Colin Purrington Photography: Insects &emdash; Hummingbird clearwing moth (Hemaris thysbe) showing wing veination

Colin Purrington Photography: Insects &emdash; Hummingbird clearwing moth (Hemaris thysbe) nectaring

Colin Purrington Photography: Insects &emdash; Hummingbird clearwing moth (Hemaris thysbe) nectaring at wild bergamot

Colin Purrington Photography: Insects &emdash; Hummingbird clearwing moth (Hemaris thysbe) nectaring at wild bergamot

Colin Purrington Photography: Insects &emdash; Hummingbird clearwing moth (Hemaris thysbe) arriving at flower

Colin Purrington Photography: Insects &emdash; Hummingbird clearwing moth (Hemaris thysbe) nectaring at wild bergamot

Colin Purrington Photography: Insects &emdash; Snowberry clearwing moth (Hemaris diffinis)

Colin Purrington Photography: Insects &emdash; Snowberry clearwing moth (Hemaris diffinis)

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