The flower flies of the genus Heringia are small, black, and infrequently encountered. They are separated from the closely-related genus Neocnemodon by the absence of projections on the mesocoxa. The larvae are thought to feed upon gall-forming aphids. 2 species are recorded for Minnesota, with at least one additional species expected.
- Heringia calcarata (Loew, 1866) ?
- Heringia canadensis Curran 1921 * – Canadian Smoothleg
- Heringia salax (Loew, 1866) – Eastern Smoothleg
