Chalcosyrphus (Xylotomima) curvaria (Curran, 1941).
Curran, C.H. (1941) New American Syrphidae. Bulletin of the American Museum of Natural History 78, 243-304. [1941.08.07]
Nearctic species known from Alaska to Nova Scotia, south to California, Colorado and New York (Thompson 2010).