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 Holcocephala fusca Bromley Holcocephala fusca Bromley, 1951: 10 . Recognition characters: Gray species; length 5–6 mm ; mystax yellowish white composed of 4–6 bristles; relatively large, widely spaced eyes; thorax humped, gray pollinose; scutellum gray pollinose lacking setae and bristles; wings dark brown; abdomen brown pollinose; legs, yellowish brown, dark brown ring at apex of tibiae, hind tibiae and first tarsal segment expanded slightly. Distribution: TETON: Biological Research Station, Old Moran, Grand Teton National Park, 2,042 m ( 6,700 ft ), 18 July 1962 ( JGE ). Habitat: Sagebrush steppe shrub and grassland vegetation type . Ethology: Nothing known. Prey: None known.