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 Holopogon atripennis Back Holopogon atripennis Back, 1909: 312 . Recognition characters: Blackish species; length 5–7 mm ; mystax white; thorax gray pollinose, pilosity less dense than preceding setae on abdominal segment 1 only; wings brown; legs black, setae and bristles white on femora and tibiae, black on tarsi. Distribution: PLATTE: 64 km NE of Laramie, 13 July 1937 ( RHB-UK ): Laramie Peak, Laramie Mtns.; 17 July 1964 ( RJL , FRH ). Habitat: Grama-needlegrass-wheatgrass grassland vegetation type . Local population occurred in stand of mountain mahogany on edge of clearing, on mountainside. Ethology: Rests on and forages from tips of dead branches of mountain mahogany 0.6– 1 m above the ground. Prey: None known.