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Photo#868899
Robberfly - Efferia tagax - male

Robberfly - Efferia tagax - Male
Madera Canyon, Santa Cruz County, Arizona, USA
July 28, 2013
Size: ~1.5cm
Feeding on grasshopper in Mesquite scrub

Images of this individual: tag all
Robberfly - Efferia tagax - male Robberfly - Efferia tagax - male Robberfly - Efferia tagax - male Robberfly - Efferia tagax - male

Moved
Moved from Efferia.

Moved
Moved from Robber Flies.

Fine shot
Looks like it is in the Pogon group. And that is a large one. Shots of wing and close blow ups of the male terminus always help.

 
Fullsize
Here's a link to the original http://www.flickr.com/photos/44150996@N06/9572252319/sizes/o/; I also posted the crop of the terminus and a second shot that shows a little more detail in wing venation.

 
Very nice
Added shots. And trying to make this into a Pogon or Staminea did not work out in the big Wilson key. The terminus is helpful but more helpful is the possibility that the hind tibias are bent forward and enlarged in your full length shots. Can you make a close up of that one lateral hind tibia?

This would make it one of the three Albibarbs with this feature and the terminus favors Efferia tagax. It is a species known from Santa Cruz county. As with most of these western Efferia, I have not gotten to see definitive specimens.

Wait, just used your full sized image length. I think this is tagax.

Moved for expert attention.
Moved from ID Request.

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