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Photo#1331623
Robber Monster (lateral) - Efferia albibarbis - male

Robber Monster (lateral) - Efferia albibarbis - Male
Tonopah Desert, Maricopa County, Arizona, USA
June 2, 2015
Size: 21mm
The white mystax and the abdominal markings, along with the red tibiae make this look like a male Efferia albibarbis.
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ID info:
Keying to species in the genus Efferia: (eastern)(1)
Note, though the key was designed for the eastern range, many of the key features are still applicable to the widespread species, such as this one.
1 - Furcation of third vein opposite or beyond base of second posterior cell = 18
18 - Posterior branch of third vein curved forward, meeting the costa plainly before the apex of wing = 23
23 - Mesothorax broadly rounded above and without a conspicuous crest of hairs = 28
28 - Mesothorax with very short hair anteriorly, a few rather prominent bristles posteriorly; scutellum with short hair on disk and usually with not more than half a dozen bristles on margin = 30
30 - Male abdomen without ventral prominences (Albibarbefferia/barbatus group) = 31
31 - Hypopygium small or of normal size, medium-sized or small species, usually of slender build, male costa not at all or only very slightly expanded = 32
32 - Mystax pale, sometimes with a few black bristles on upper margin (13-20mm) = species albibarbis Macquart (1838)

Images of this individual: tag all
Robber Monster (lateral) - Efferia albibarbis - male Robber Monster (lateral thorax) - Efferia albibarbis - male Robber Monster (lateral abdomen) - Efferia albibarbis - male Robber Monster (ventral abdomen) - Efferia albibarbis - male Robber Monster (lateral head) - Efferia albibarbis - male Robber Monster (sunlight) - Efferia albibarbis - male Robber Monster (wing pattern) - Efferia albibarbis - male Robber Monster (shade) - Efferia albibarbis - male Robber Monster (sunlight rear) - Efferia albibarbis - male Robber Monster (sunlight lateral) - Efferia albibarbis - male

Moved
Moved from Efferia.

Moved
Moved from Robber Flies.

The wing veins, the body size and shapes, as well as the antennae qualities, are good for the genus Efferia.