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Species Promachus giganteus

Big Robber - Promachus giganteus Big Robber - Promachus giganteus Promachus giganteus - female Promachus giganteus? - Promachus giganteus - male
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 giganteus (Promachus giganteus)
Explanation of Names
Promachus giganteus Hine 1911
One of the largest North American robber flies; quite common in NM and w. TX throughout June and sometimes as late as August. Sufficient rainfall is required to support a large population. Their prey includes large grasshoppers, cicadas, the largest Xylocopa, male Pepsis wasps and other large robber flies. Female body frequently exceeds 40 mm (occasional giants >46 mm). The wings are proportionately longer than those of other Promachus. Though frequently mistaken, even by entomologists, for the large form of P. nigrialbus from central Arizona, giganteus can be separated by the mixture of gray pollen into the black abdominal bands, ovipositor beginning with segment six, sparse black spination dorsally on femora (appearing gray from a distance - those of nigrialbus appear nearly black) and larger size (though some nigrialbus individuals overlap small giganteus in length). --David Williams
TX-AZ; Mexico(1)