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fly probably Asilid black abd face view - Cyrtopogon willistoni - male - female

fly probably Asilid black abd face view - Cyrtopogon willistoni - Male Female
6 miles NW Lyons, Boulder County, Colorado, USA
July 9, 2009
Size: Bl~ 13.5 mm
This fly, probably a robber fly, has a black abdomen with most of the segments edged with white hairs. The eyes and part of the face are visible. Possibly a male? It is similar to the previously submitted fly, #772795, but seems to have more lateral white hairs along the abdomen sides. This seems to be a common fly that we see most years in early to mid July. Any help is much appreciated.

Moved from Robber Flies.

The male is chasing a female, during lunch!
Nice catch, the first live images of this species! (both genders) Some of the species in this genus have males with unique, modified middle and fore-legs, just exactly like this guy, fantastic shot! Check out Cyrtopogon willistoni. (north-western) The wing veins match, as well.

Crytopogon willistoni
Thanks so much for your exciting comments and identification. I debated about sending this image in with the incomplete insect, but now am very glad I did. Your help is much appreciated.

Please check all of the appropriate boxes.
As you already know, I'm a big fan of your excellent bee images. You had the correct genus four years ago. Like you stated, (above) the hairy abdomen doesn't fit most of the other species and you have other images in this genus.
Please move them down. If I was an administrator, I would place this image on the info tab. This species is supposed to be widespread in the north-west, including Colorado. A first for your state, congrats!

Thanks again
I just moved the image to C. willistoni. This Cyrtopogon genus has very handsome asilids and I'm delighted to add this new one to the group. It's exhilarating to get an insect identified to species! I appreciate your comments about the bee photos, too.

Moved from ID Request.

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