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Photo#380520
Unknown Asilid from California - Lestomyia

Unknown Asilid from California - Lestomyia
Las Trampas Regional Wilderness, Contra Costa County, California, USA
March 28, 2010
Size: 1 cm
There were many, many robber flies along this stretch of scrubby trail in Las Trampas, and the ones that I could glimpse seemed to have caught wasps. If I go by Powell and Hogue's California Insects, I guess this is Stenopogon, Machinus, or Efferia, but the pics of many other genera look very similar. Not sure what diagnostic features I should be looking for. Leg color? Hair counts?

Moved
Moved from Robber Flies.

Pretty distinctive
Leg colors and notable antenna. It is not Machimus or Efferia, both in the big Asilinae group. And it is not a Stenopogon. But 10mm and flying in March with those characters should eliminate quite a few robbers for Dr. Fisher. I doubt he has seen it yet.

 
Lestomyia sp., probably a fem
Lestomyia sp., probably a female.

 
Thanks!
I will move it momentarily. Any particular features that mark this as Lestomyia, other than the fact that it was flying in March and perching on the ground?

 
Ken-ichi: mainly the 'look' (
Ken-ichi: mainly the 'look' (gestahlt, jizz) in this photo (can't see any really diagnostic features). The shape of the flagellum (ovate), strong dorsocentrals & leg color are characteristic of the majority of species in this genus.

Eric

Can't help with the ID
but I would like to compliment the photo, great shot.

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