This Saropogon is from Oklahoma. Taken by Dale Randall in Roger Mills county. It was feeding on ants which is not a common behavior for any robber. Note the marked similarity to our Diogmites. This is a genus of about 19 species in the west and central states. (See the Texas list.) About four species are known from OK and this is almost certainly S. pritchardi. Pritchard did quite a bit of work in the west central states. Though this species was described by the ever active Bromley. Note the heavier terminus compared to male Diogmites. And the antenna shape is different.

Shot showing the actual ant in feeding position. Apparently it was making quite a pile of dead ant victims in this open area of cow country. Thanks to Dale for use of these shots and Roy Beckemeyer for the information.