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Species Promachus bastardii

Robber Fly - Promachus? - Promachus bastardii What kind of Robber Fly - Promachus bastardii - male Big Robber - Promachus bastardii White-Tailed Robber Fly - Promachus bastardii Promachus bastardii ? - Promachus bastardii unid medium robberfly - Promachus bastardii Robber Fly - Promachus bastardii - female Robber fly - Promachus bastardii
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 Promachus (Giant Robber Flies)
Species bastardii (Promachus bastardii)
Other Common Names
False Bee-Killer
Circa 20-30 mm
Similar to P. fitchii. Males have distinctive white tip on abdomen and white bands on thorax. See Internet references.
Includes eastern, southeastern and south-central United States. Reported from Kansas, Texas, Arkansas, North Carolina, Michigan.
Fields, open areas, with flowers
June-July (North Carolina)
Predatory, especially on hymenoptera
Life Cycle
Eggs presumably deposited in soil near grass roots. Larvae predatory, pupate in unlined cells in soil. This is based on information for P. fitchii. (1)
Print References
Milne, p. 661--description (1)
Salsbury, p. 397--description (2)
Brimley, p. 340, lists P. bastardii and P. rufipes for North Carolina. (3)
Internet References
North Carolina State University Entomology--17 pinned (only P. bastardii and P. rufipes are listed for the state).
Works Cited
1.National Audubon Society Field Guide to Insects and Spiders
Lorus and Margery Milne. 1980. Knopf.
2.Insects in Kansas
Glenn A. Salsbury and Stephan C. White. 2000. Kansas Dept. of Agriculture.
3.Insects of North Carolina
C.S. Brimley. 1938. North Carolina Department of Agriculture.