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 albifacies Williston Promachus albifacies Williston, 1885: 63 . Recognition characters: Brown and black species; length 19–28 mm ; mystax straw white with at most a few black setae below; thorax brown pollinose; scutellar setae black and white, bristles black; wings nearly hyaline; abdomen black, brown pollinose laterally, patches of white setae laterally; legs largely black occasionally with some red posteriorly. Distribution: GOSHEN: 20 July1950 ( REP ). PLATTE: E flank of Laramie Peak, Laramie Mtns., 17 July 1964 ( FRH , RJL ). NATRONA: Alcova, 8 July 1907 (specimen in CAS ). NIOBRARA: 8 July 1949 ( DGD ). Recorded from Wyoming by: Fisher & Wilcox (1997) ; Lavigne & Dennis (1994) . Habitat: Pine-douglas fir forest (clearings within the forest where shrubs and grasses are dominant), sagebrush steppe shrub and grassland, and grama-needlegrass-wheatgrass grassland vegetation types . At Laramie Peak, P. albifacies was found foraging from lodgepole pine and mountain mahogany on the edge of a mountainside clearing; mixed coniferous forest. Ethology: Forages from vegetation. Prey: All records were taken at Laramie Peak, Platte Co., on 17 July 1964 . HEMIPTERA (Heteroptera) , Reduviidae : Rhynocoris ventralis (Say) ; LEPIDOPTERA , Lasciocampidae: Malacosoma sp. possibly californicum fragile (Strech). [ COLEOPTERA (see Lavigne & Dennis 1994 )].