Back, 1909: 337 Willistonina bilineata nigrofemorata 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 8827 468819 Back Back. 1909 [151,370,1047,1074] Insecta Asilidae Willistonina Animalia Diptera 117 118 Arthropoda genus     Willistonina  Back, 1909: 337. Species found in Wyoming:  Willistonina bilineata nigrofemorata.