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Species Efferia aestuans - [Nerax] aestuans

Robber Fly - Efferia aestuans - male - female Robber - Efferia aestuans Robber Flies Mating - Efferia? - Efferia aestuans Genus Efferia? - Efferia aestuans A taste of things to come - Efferia aestuans - female Robber Fly - Efferia aestuans Fly - Efferia aestuans Cooperative Robber Fly - Efferia aestuans
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Asiloidea
Family Asilidae (Robber Flies)
Subfamily Asilinae
Genus Efferia
No Taxon (Nerax group)
Species aestuans ([Nerax] aestuans)
Synonyms and other taxonomic changes
Efferia aestuans (Linnaeus, 1763)
Asilus aestuans (original combination)
Nerax aestuans is listed as a junior synonym at the USDA's The Diptera Site (dead link)
Explanation of Names
Likely from Latin aesta, "the summer heat" (1).
Size
body length: 18 mm (male); 23 mm (female)
Identification
See discussion under images.
Range
Ontario and New Hampshire south to Florida, west to Wyoming and New Mexico
Remarks
This is the type species of the genus Efferia
Internet References
classification and distribution (The Diptera Site, USDA--link dead)
Works Cited
1.Dictionary of Word Roots and Combining Forms
Donald J. Borror. 1960. Mayfield Publishing Company.