Hadromyia (Hadromyia) grandis Williston
Diagnostic description:
Hadromyia (Hadromyia) grandis Williston, 1882.
Williston, S.W. (1882) New or little known genera of North American Syrphidae. The Canadian Entomologist 14, 77-80.
Distribution:
Nearctic species known from British Columbia to Oregon and Idaho (Thompson 2010).