Robber flies (Insecta: Diptera: Asilidae) of Wyoming, USA with keys to genera and species Author Lavigne, Robert J. Author Dennis, Steve text Zootaxa 2019 2019-08-30 4662 1 1 126 journal article 25823 10.11646/zootaxa.4662.1.1 7070ef91-15db-4b7e-a87d-72e7b0bdb192 1175-5326 3383448 366A1E81-946C-4ED4-8A65-C51151FE87CC Leptogaster Meigen Leptogaster Meigen, 1803: 269 . Species found in Wyoming : Leptogaster arenicolus , L. aridus , L. coloradensis , L. eudicranus , L. hesperis , L. murinus , L. parvoclavus , and L. salvius . Key to Species of Leptogaster [adapted from Martin (1957) ] 1 Average of 6 to 10 bristles in mystax.......................................................................2 - Average of 12 or more bristles in mystax.....................................................................4 2 Occipital bristles black; first antennal segment black, second yellowish, third brown.................. Leptogaster aridus - Occipital bristles white, pale or tinged with color............................................................ 3 3 First and third antennal segments black, the second red.................................... Leptogaster coloradensis - First antennal segment polished, reddish brown, second orange yellow, third brown................ Leptogaster hesperis 4 Mystax bristles spaced closely together in a single row, rarely matted (some specimens with fewer than 12 bristles); face and occiput ochraceous or white tinged with yellow............................................. Leptogaster murinus - Mystax bristles close together, often 2 or more rows, frequently several matted together; face white.................... 5 5 Occipital bristles black; second antennal segment totally red or yellow; all femora and tibiae with dark fasciae; gonoforceps truncated apically................................................................... Leptogaster eudicranus - Occipital bristles pale, sometimes tinged with color; second antennal segment black, brown to reddish brown or dark red; gonoforceps not truncate apically............................................................................. 6 6 Dorsum of abdomen subshining brown; thinly gray pollinose, laterally with dense pollen; second antennal segment black..................................................................................... Leptogaster arenicolus - Dorsum of abdomen brown pollinose, laterally gray pollinose; second antennal brown to reddish or dark red............. 7 7 Head vertex gray around ocellar tubercle; second antennal segment brown to reddish brown; thorax gray tomentose, with brown V-shaped stripe.................................................................. Leptogaster salvius - Vertex brown; second antennal segment dark red; broad, brown thoracic median stripe........... Leptogaster parvoclavus