This species belongs to the subgenus Enoplempis, as indicated by the presence of specialized ventral spines on the tarsomeres, although it does not have the modified hindlegs characteristic of other Enoplempis species.
Empis snoddyi is a "balloon fly" - males form small balloons out of froth, which are given to females as nuptial gifts during mating. The mating behavior was reported by Sadowski et al. (1999). Males form swarms of 5-15 individuals beginning at dawn, and interact vigorously within the swarm, chasing each other and even grappling in midair. Females join the swarm and individually visit each male before choosing one with a balloon and chasing him out of the swarm. After mating, the female drops the balloon. Males will not make a new balloon and remate until the next day.
Mountains of N. Georgia, W. North Carolina, and E. Tennessee