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Photo#857836
Robber Fly - Stenopogon rufibarbis

Robber Fly - Stenopogon rufibarbis
Castle Lake near Mount Shasta, Siskiyou County, California, USA
July 14, 2013
I realize there are roughly 7000 robberflies around.

Moved
Moved from Robber Flies.

Stenopogon
Well, it's a female Stenopogon, that much is easy. With just a picture of a lone female I doubt you'll ever get a rock-solid species ID, but I'd say it's almost certainly S. rufibarbus. Definitely in the rufibarbus group (light mystax, big gibbosity, femorae all black with red tips, tibiae all red).
My species ID is based mainly on the tergite pollinosity pattern (bare patch slender on T5, wide on 6, complete on reddish-brown 7-8), and on the fact that I caught several identical-looking specimens I'm calling rufibarbus 10 miles away (at Deadfall Lakes) three weeks earlier.

 
Stenopogon
Wow, that's a lot of good details. Thanks.

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