Cole, 1919: 229 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 88JGY Cole Cole 1919 [151,428,1854,1882] Insecta Asilidae Leptogaster Animalia Diptera 96 97 Arthropoda species aridus     Leptogaster aridus  Cole, 1919: 229.   Recognition characters:Grayish brown species; 9 mm; mystax white; thorax gray pollinose; scutellum black, gray pollinose lacking bristles; wings hyaline; abdomen dark brown, posterior margins of segments 2–5 yellow; legs yellow, swollen part of hind femora, distal half of hind tibiae and last four joints of tarsi brown.  Distribution:CAMPBELL: Wyodak Plant/Station 1, 3, 8, A-2, 12B, Gillette, 10 June 1977( DM); Wyodak Plant/Station 1, Gillette, 22 June 1977( DM); Wyodak Plant/Station 13–15, Gillette, 24 May 1977( DM): JOHN- SON: 2.1 km N of I-90, Powder River Rd. Exit 8 June 1980( RJL); SHERIDAN: Sheridan, WANG, LTA, 14–15 June 2007( CSU, GMAD); 24–25 June 2010( BCK, BH) ( CSU, GMAD); 8–9 July 2010( BCK, DAL) ( CSU, GMAD).  Habitat:Wheatgrass-needlegrass shrub steppe shrub and grassland, and grama-needlegrass-wheatgrass grassland vegetation types.  Ethology:Nothing known.  Prey:None known.