Key to the genera of nearctic Syrphidae Miranda G.F.G, Young A.D., Locke M.M., Marshall S.A., Skevington J.H., Thompson F.C. 2013. Can. J. Arthropod Identification 23: 1‒351.
Contributed by v belov on 19 January, 2013 - 3:20pm Last updated 20 January, 2014 - 5:13pm