Archive for April 2023

Borderland State Park   Leave a comment

Northwest Trail

Perhaps the latest start to the bugwatching season I’ve had for a long time! The weather was cold-ish (14 C/57 F approximately) so not a lot of insects, but the ones I could see were fairly low-energy, allowing me to take some very close up photos.

For some reason, there were dozens of march flies (Bibionidae). I’ve never seen that many in one walk.


As promised, tons of Bibionids. The large eyes belong to the males. But which ones? says:

Genera can be distinguished by wing veins:

Rs forked, R2+3 at sharp angle, R4+5 nearly straight (Southeast): Plecia

Rs forked, R2+3 at sharp angle, R4+5 distinctly curved (North): Hesperinus brevifrons

Rs forked, R2+3 parallel to wing: Penthetria heteroptera

Rs unforked, partially merged with M: Bibioides

Rs unforked, basal section of Rs much shorter than R-M crossvein: Dilophus

Rs unforked, R-M crossvein shorter than or similar in length to basal section of Rs: Bibio

The last two also have strong protibial spurs.

Key to CA spp. (adults) in(4)

This photo of the veins of Bibio is from the link, apparently in public domain:

Also, this link has wing venation for Penthetria:

And honestly, I don’t know which one is a good fit with the images below. My best guess is Bibio ‘Boston’ species, nr. lanigerus, compare with

First, here are some views with the wing patterns.

This one is a female.

Tachinidae, I think. I believe that’s the diagnostic large post-scutellum at the end of the thorax.


Leafhopper, I think Erythridula. Tom Murray in Insects of New England calls this Arboridia plena, but I think that’s a deprecated name.


I think this is Pedilus lugubris, in Pyrochroidae (“Fire-colored beetles”). EDIT: Actually, I guess Silis in sub-family Silinae, family Cantharidae is just as likely.


Ichneumonidae –> Ophioninae –> Ophion sp. perhaps

I’ve seen this before, and I don’t have an explanation: the head of an ant, partially buried in the soil. Caused by some sort of parasite?


As always, Leucauge venusta all over the place. They’re the first spiders I see in spring (along with Cyclosa conica) and the last ones I see in fall.


Posted 2023-04-30 by gaurav1729 in Uncategorized