Microstylum galactodes - New Mexico
This is a very large robberfly that I found just south of Alamogordo, NM, in grassland, mesquite scrub habitat (see picture).  It is probably the most spectacular robberfly I have seen.  Otero Mesa. Otero County, NM 6-2-09

Male - lateral

Male - dorsal

Female - lateral

Male - face

Habitat - Grassland, Mesquite and Four-winged Saltbush

images copyright Bob Barber