1. Labrum paler than posterior margin of head . . . . . . . . . . . . . . Alloperla caudate
Pigmentation of labrum about same as posterior margin of head . . . . . . . . . . . . . . 2
2. Vertical cercal fringe poorly developed, sparse on ventral margin and obsolete or absent on dorsal margin; anterolateral margins of frons slight slanted, angulate from base of fronotclypeus to labrum . . . . . . . . . . . . . . . . . . . . . . . . . . . Alloperla usa
Vertical cercal fringe well developed on dorsal and ventral margins of several mid to apical segments; anterolateral margins of frons smoothly rounded between frontoclypeus and labrum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Posterior pronotal fringe consists of two rather widely spaced long setae at corners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alloperla imbecilla
Posterior pronotal fringe consists of 1 or 2 short setae placed between longer setae at corners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Mid fringe setae on abdominal terga 8-9 similar to those located just laterad to innermost long thin setae; mesonotum with about 8 outer marginal setae; vertical cercal fringe begins on segment 9. . . . . . . . . . . . . . . . . . . . . . Alloperla petasata
Mid fringe setae on abdominal terga 8-9 much thinner and more widely spaced than those located laterad to innermost long thin setae; mesonotum with about 4 or with about 12 outer marginal setae’ vertical cercal fringe begins beyond segment 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Alloperla neglecta
A. idea and A. chloris not described as nymphs (Stewart & Stark, 2002).
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Key to the Species of Ohio Alloperla Nymphs
(Modified from Poulton & Stewart, 1991, and Stark & Kondratieff, 2010)