1. Whorls of 8 or more long bushy bristles on cercal segments. . . . . . . Leuctra sibleyi
Whorls with 5 or fewer bristles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. In side view, all abdominal tergites covered with short, stout bristles . . . . . . . . . . 4
Only the last 3 or 4 abdominal tergites with short, stout bristles . . . . . . . . . . . . . . 3
3. Anterolateral angles of mesonotum with many short, stout bristles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Leuctra tenella
4. As seen in profile, some abdominal sternites, at least the 9th, bear numerous short,
stout bristles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
No stout bristles on abdominal tergites; however, a few long bristles on posterior margins of last segments. . . . . . . . . . . . . . . . . . . . . . . . . . . Leuctra ferruginea
5. Short stout bristles on nearly all sternites, at least on sternites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . Leuctra duplicata
Short stout bristles numerous only on sternite 9, although there may be a few on
preceding sternites. . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . Leuctra tenuis
Undescribed as nymphs: Leuctra alexanderi, Leuctra rickeri
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Key to the Species of Ohio Leuctra Nymphs