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Stenopogon rufibarbis female - Stenopogon rufibarbis - female

Stenopogon rufibarbis female - Stenopogon rufibarbis - Female
Anza-Borrego Desert State Park, San Diego County, California, USA
May 22, 1997
Size: large
This large robber fly, probably a Stenopogon, was photographed preying on an uncommon False Click Beetle (Eucnemidae), Perothops witticki, in Upper Oriflamme Canyon, elevation about 4000 ft. in late May. The robber fly is very similar to S. californiae, # 202267, in body shape, wing length, long hairs fringing thorax, beard, etc. but the color is quite different. Any help with identifying this regal robber fly will be much appreciated.

Moved from Robber Flies.

the prey looks like an eucnemid...
...but can't help with the predator, sorry

Eucnemid prey
I'm happy to have you agree about the prey. We saw and photographed a Eucnemid on the same day and the about the same place as we took this robber fly photo. This prey really looks like the live beetle in many details, but some details are impossible to tell. Thanks!

I agree with the prey item genus, but the species is a trickier one. Most high altitude Perothops I have seen are P. cervinus, most of the P. witticki coming from lowland localities. These are hard to identify from an image, however, and it really does not matter that much.
Jyrki Muona

Prey Perothops witticki
It would be impossible to ID the Perothops from this picture of the prey. I will post the two photos that were used to ID P. witticki and the basis on which I identified it to species.

Robber fly is
Stenopogon rufibarbis (looks to be a female), a widespread W. U.S. species.

Stenopogon rufibarbis female
I am delighted to have this large and handsome robber fly identified to species! Thank you so much. We have seen this species in different locales in The Park, so it is fairly common here.

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