Lejops (Lunomyia) cooleyi (Seamans, 1917).
Seamans, H.L. (1917) A new species of Tropidia (Syrphidae) from Montana (Dipt.). Entomological News 28, 342. [1917.12.29]
Nearctic species known from Oregon to Saskatchewan, south to California and Colorado (Thompson 2010).