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Genus Proctacanthus

Robber Fly - Proctacanthus fulviventris Unknown robber fly - Proctacanthus brevipennis Unknown bug - fly? - Proctacanthus milbertii Robber Flies? - Proctacanthus - male - female Au Train Prairie 1 - Proctacanthus milbertii Proctacanthus nearno robberfly 3375 - Proctacanthus robberfly - Proctacanthus - 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 Proctacanthus
Other Common Names
Giant Robber Flies, Spine-tailed Robber Fly (P. arno)
Explanation of Names
Proctacanthus Macquart 1838
17 spp. in our area (4 reach Canada), ~30 total(1)
Large robber flies with a prominent beard
Canada to Brazil; in our area, throughout the US and so. Canada; 11 spp. in the east(1)
P. brevipennis in NC: Apr-Jul; P. milbertii: Jul-Oct in NC, Jul-Aug in MN
Life Cycle
Eggs laid in crevices in soil. Larvae are predatory on soil insects, also said to eat roots, decaying plant matter. Larvae may require more than one year to reach maturity. Pupation in soil.
Print References
Hine J.S. (1911) Robberflies of the genera Promachus and Proctacanthus. Ann. Ent. Soc. Amer. 4(2): 153-172 (full text)
Internet References