Promachus albifacies Williston, 1885: 63 Robber flies (Insecta: Diptera: Asilidae) of Wyoming, USA with keys to genera and species Lavigne, Robert J. Dennis, Steve Zootaxa 2019 2019-08-30 4662 1 1 126 4MS2M Williston Williston 1885 [151,515,605,632] Insecta Asilidae Promachus Animalia Diptera 58 59 Arthropoda species albifacies    Promachus albifaciesWilliston, 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 Wyomingby: 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. albifacieswas 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:  Malacosomasp. possibly californicum fragile(Strech). [ COLEOPTERA(see Lavigne & Dennis 1994)].