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 Willistonina bilineata nigrofemorata Wilcox Willistonina bilineata nigrofemorata Wilcox, 1935 , Pan-Pacific Entomologist, 11: 33. Recognition characters: Blackish species; 11–13 mm ; mystax dense white, confined to oral margin; thorax black, bristles mostly black, but some yellowish to brownish; three pairs of scutellar bristles on margin, one pair brownish, the others black; fore and middle coxae of legs reddish, with dense white setae in males, shorter and more scattered in females; femora black with very short recumbent yellowish setae; abdomen ground color black basal one-half to two-thirds and red apical one-third to one-half. Distribution: Recorded from Wyoming by: Geller-Grimm (2018) . Habitat: Habitat not identified in Wyoming . Ethology: Nothing known. Prey: None known.