Osten-Sacken, 1877: 297 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 33NHY Osten-Sacken Osten-Sacken 1877 [151,553,1407,1434] Insecta Asilidae Cyrtopogon Animalia Diptera 70 71 Arthropoda species plausor     Cyrtopogon plausor  Osten-Sacken, 1877: 297.   Recognition characters:Blackish species; length 14–16 mm; third antennal segment black; mystax yellowish white with a few black bristles below; thorax yellowish brown pollinose with three darker stripes dorsally; wings slightly tinged with brown; macrotrichia of costal vein black; scutellar setae black; abdomen shining black, gray pollinose fasciae interrupted on all tergites; lateral setae on abdominal segments 1–4 yellowish white; legs, femora black, tibiae reddish brown ringed with black at apex, fore tarsi of males with fringe of dense silvery white setae not parted in middle.  Distribution:ALBANY: 16 kmE of Laramie, elevation 2,438 m( 8,000 ft), 24 June 1961( RHP, EMP) (three specimens in CAS); 29 mSE of Laramie, elevation 2,438 m, 26 June 1961( RHP) (three specimens in CAS); 40 kmE of Laramie, 2 June 1965( MGH); Pole Mtn., 17 June–2 July 1964( FRH, RJL), 22–28 June 1965( FRH, RJL); Snowy Range Mtns., 15 Aug. 1938( MTJ, CSU); University of Wyomingcampus, Laramie, Aug. 1938( BP-CSU). LARAMIE: Pine Bluffs, 26 June 1967( RJL). PLATTE: Dwyer, 1 May 1960( RJL); Glendo, 1 May 1960( RJL); WAHSAKIE: Tensleep, 2 June 1961( RJL). Recorded from Wyomingby: Fisher & Wilcox (1997); Geller-Grimm (2018).  Habitat:Wind sheltered gullies and intermittent streambeds in douglas fir forest and pine-douglas fir forest; wheatgrass-needlegrass shrub steppe shrub and grassland, and grama-needlegrass-wheatgrass and grama-buffalo grassland vegetation types.  Ethology:Rests on and forages from rocks and fallen logs in sun.  Prey: HEMIPTERA (Heteroptera), 28 June 1961( ECVD) (specimen in CAS).