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 Asilus Linnaeus Asilus Linnaeus, 1758: 605 Species found in Wyoming : Asilus vescus . Asilus vescus Hine Asilus vescus Hine, 1918: 320 . Recognition characters: Grayish black species; length 7–10 mm ; mystax black above, white below; sides of thorax gray pollinose, dorsally brown pollinose, two dorsal black stripes separated by a gray line; scutellum with 2 black bristles on posterior margin; wings hyaline, slightly gray on posterior margin and at apex; abdomen brown pollinose with gray pollinose bands apically; legs, femora black, fore- and mid-tibiae blackish, hind tibiae reddish brown. Distribution: SWEETWATER: Burnt Fork, 19–26 June ( VMT-BYU ). TETON: Biological Station at Moran, Grand Teton National Park, 2,042 m ( 6,700 ft ), 13 Aug. 1962 ( JGE ). Habitat: Sagebrush steppe shrub and grassland vegetation type . Ethology: Nothing known. Prey: None known.