Mating Robber Flies

Mating Robber Flies
February 26, 2010
Hi, WTB,
Mating Robber Flies.  Mid-July, 2009.  Foothills of the Santa Rita Mountains, southern Arizona, about 4,400′.  There are lots of Robbers around here, and I’m always glad to observe them.
Best,
Denny

Hi Denny,
We believe these may be Neomochtherus californicus, a species of Robber Fly that is represented on BugGuide with a single series of three images, though we would need to defer to a Diptera expert, or better yet, a Asilid expert, for a conclusive identification.