Promachus albifacies Williston, 1885

Lavigne, Robert J. & Dennis, Steve, 2019, Robber flies (Insecta: Diptera: Asilidae) of Wyoming, USA with keys to genera and species, Zootaxa 4662 (1), pp. 1-126 : 59

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)].