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Genus Polacantha

Polacantha gracilis - male Polacantha gracilis - male Polacantha gracilis - male Polacantha species - Polacantha grossa - male Robber - Polacantha Robber - Polacantha - female Robber - Polacantha - female Robber Fly? - Polacantha
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Orthorrhapha" (Brachycera excluding Aschiza and Schizophora))
Superfamily Asiloidea
Family Asilidae (Robber Flies)
Subfamily Asilinae
Genus Polacantha
Numbers
10 species, all in the new world.
Remarks
6 species in the U.S.: P. pegma in California, P. grossa and P. sinuosa in Texas, P. arctuata in Arizona, P. gracilis from Maryland to Florida, P. composita from Oregon to Utah and south. There are several species in Mexico as well. This geographic data shouldn't be used to identify these flies as the ranges are likely to be broader.
Internet References