1. Posterior spiracles borne on sharply pointed spines. . . . . . . . . . . . . Hydrellia sp.
Posterior spiracles not borne of sharply pointed spines. . . . . . . . . . . . . . . . . . . . 2
2. Larva with ventral prolegs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Larva without ventral prolegs. . . . . . . . . . . . . . . . . . . . . . . . . . .. . Ochthera sp.
3. Breathing tube bearing pair of filaments near base. . . . . . . . . Ephydra sp. (in part)
Breathing tube lacking pair of filaments at base. . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Dorsum of larva with distinct pattern coposed of darkened scales and spinules. . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ephydra sp. (in part)Dorsum of larvae lacking distinct pattern, nearly uniform in color. . . . . Setacera sp.
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Key to Ephydridae Nymph Genera