This genus has not been reviewed in NA since Coquillett (1892) and needs revision based on genitalic characters. Outside of some better-known local faunas, identification to species is difficult and tentative at best.
worldwide; in our area, mostly western but relatively well represented in the east (~17 spp.) and in Canada (12 spp.); at least 3 spp. are transcontinental(1)
Endoparasitoids of Noctuidae, Lycaenidae, Tabanidae, Tenebrionidae, Myrmeleontidae. (Research.net. Yeates, D. The evolutionary pattern of host use in the Bombyliidae (Diptera): a diverse family of parasitoid flies)
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