1. Longest marginal bristles on abdominal terga about one sixth or one fifth as long as mid-dorsal length of corresponding tergum (Fig.1.1); abdominal bristles light; cerci not banded (Fig.1.2); proterance of genitalia in mature male larvae longer than broad in dorsal view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ostrocera truncata
Bristles at least three quarters length of the segment. Spring species, mature larvae found from April to early July; larger bristles on femora and tibiae are same color as leg or only slightly darkeLongest marginal bristles on abdominal terga about one third as long as corresponding tergum; abdominal bristles dark; cerci lightly banded; protuberance of genitalia in mature male larve about as long as broad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . Ostrocera albidipennis
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Key to the Genera of Ohio Ostrocerca Nymphs
