Stichopogon trifasciatus (Say)

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 : 116

Stichopogon trifasciatus (Say)

Dasypogon trifasciatus Say : 51.

Recognition characters: Gray species; length 9–11 mm; mystax white; thorax gray pollinose, scutellar setae short, white, on margin of scutellum only; scutellar bristles lacking; wings hyaline; abdomen gray pollinose, tergites 1, 4, 8 and 9 silvery gray dorsally producing a striped appearance; legs gray pollinose, setae and bristles white.

Distribution: GOSHEN: Lingle, 14 July 1937 ( CLF-UK). PLATTE: Camp Guernsey, WANG, 2001b ( CSU, GMAD); Dwyer, 3 July 1964 ( RJL), 13 Aug. 1964 ( LJS); Guernsey, 16 July 1964 ( FRH, RJL); Gray Rocks Ranch, Camp Guernsey, WANG, 14 July–5 Aug. 2008 ( CSU, GMAD); Guernsey State Park, 16 July–16 Aug. 1964 ( RJL); Loomis Ranch, Wheatland, 18 July 1963 ( RJL), 5 Aug. 1964 ( FRH, RJL), 28 July 1965 ( FRH), 24 June 1966 ( RJL); 16 km NW of Wheatland, 21 Aug. 1972 ( SD). Recorded from Wyoming by: Adisoemarto (1967) (New Castle); Barnes, (2010b); Dennis et al. (2010); Fisher & Wilcox (1997) (entire United States); Geller-Grimm, (2018); Lavigne & Holland (1969).

Habitat: Grama-needlegrass-wheatgrass, grama-buffalo grass, and wheatgrass-needlegrass vegetation types. In dry beds of intermittent streams and on banks of sluggish creeks (see Lavigne & Holland 1969).

Ethology: Rests on and forages from sand or small rocks (see Lavigne & Holland 1969).

Prey: ARANEAE, DIPTERA , HEMIPTERA (Homoptera) , HYMENOPTERA (see Dennis et al. 2010; Lavigne & Holland 1969; Rogers & Lavigne 1972).