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Photo#723398
Kelso Dunes Robber Fly - Proctacanthus coquillettii - female

Kelso Dunes Robber Fly - Proctacanthus coquillettii - Female
Kelso Dunes, Mojave National Preserve, San Bernardino County, California, USA
September 22, 2012
I saw a few of these on the sand between shrubs. I think this one is a female, from the look of the terminalia...is that right?

I could key this clearly in the Manual of Nearctic Diptera(1) to tribe Asilini via the following characters:

1' R2+3 joining R1 proximal to end of R1, with cell r1 thus separated from wing margin.....63
63' Apex of antenna with long slender bristle-like stylus; apex of cell bm usually closed by only two veins...74
74' Antennal stylus bare (i.e. not plumose)....75 (Asilini)

The next couplet, 75, asks if anatergite is bare vs. pilose...which wasn't clear to me from my images. If I follow the "anatergite bare" lead, I get to genus Proctacanthus. If I follow the "anatergite pilose" lead I'm not able to get a clear result.

Images of this individual: tag all
Kelso Dunes Robber Fly - Proctacanthus coquillettii - female Kelso Dunes Robber Fly - Proctacanthus coquillettii - female Kelso Dunes Robber Fly - Proctacanthus coquillettii - female

Moved
Moved from Robber Flies.

This is Proctacanthus coquill
This is Proctacanthus coquillettii (female).

 
Great!
Thank you Dr. Fisher, glad to learn the species...and that I was on the right track for genus and gender.

This female will complement Hartmut's male post from the same locale:

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