This genus is characterized by the bare eyes and face, antennal pits confluent, and plumose arista. The typical features of the male genitalia are the shape of the excision in the hypandrium and ventrally directed right process of the anterior lobe of the hypandrium (Barkalov 2002).
Barkalov (2002) considered Hiatomyia as a subgenus of Cheilosia, following Hull and Fluke (1950).
Synonyms:
Chilosia lugubris Williston, 1887: 45.
Chilosia willistoni Snow, 1895: 227.
Hiatomyia willistoni (Snow, 1895).
Snow, W.A. (1895) Diptera of Colorado and New Mexico. Syrphidae. Kansas University Quarterly 3, 225-247.
Nearctic species known from British Columbia to Colorado, south to California.
unless otherwise stated