Robber flies (Insecta: Diptera: Asilidae) of Wyoming, USA with keys to genera and species Author Lavigne, Robert J. Author Dennis, Steve text Zootaxa 2019 2019-08-30 4662 1 1 126 journal article 25823 10.11646/zootaxa.4662.1.1 7070ef91-15db-4b7e-a87d-72e7b0bdb192 1175-5326 3383448 366A1E81-946C-4ED4-8A65-C51151FE87CC Promachus magnus Bellardi Promachus magnus Bellardi, 1861: 26 . Recognition characters: Dark grayish black species; length 27–35 mm ; mystax white; thorax dark reddish with narrow gray dorsal stripes; scutellum with sparse white setae, black bristles rare; wings reddish hyaline, slightly darker at the apex; abdominal segments black above with gray posterior borders; male genitalia densely silvery pilose above; legs very dark reddish. Distribution: Recorded in Wyoming by Dennis & Lavigne (2007) (Platte and Sweetwater Counties). Habitat: Sagebrush steppe shrub and grassland, and grama-needlegrass-wheatgrass grassland vegetation types . Ethology: Nothing known. Prey: None known.