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 Laphria ferox Williston Laphria ferox Williston, 1883: 29 . Recognition characters: Black and yellow species; length 12–14 mm ; mystax black with few yellow setae in middle; patch of yellow pile below each antenna; thorax brown pollinose with black setae and setae; scutellar setae and bristles black; wings gray; abdomen black with mat of dense yellow setae covering all segments dorsally except black genitalia; legs, femora and tibiae black, tarsi dark reddish brown, setae and bristles black; basistyle of male with median lamellate brush-like appendage apparently formed of coalescent bristles. Distribution: PARK: Pahaska Campground, Pahaska Tepee (E entrance of Yellowstone Nat’l, Park), 21 Aug. 1963 ( LJS , RJL ). Habitat: Pine-douglas fir forest (clearings within the forest where shrubs and grasses are dominant) vegetation type . Clearings within mixed coniferous forest. Ethology: Nothing known. Prey: None known.