1. Caudal filaments with dark band near middle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Caudal filaments uniformly shaded or at most only gradually changing . . . . . . . . . . . . . . 3
2. Darker well marked abdominal terga with 2 large submedian pale areas often kidney shaped . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baetis flavistriga
Darker well marked abdominal terga with 3 posterior round pale areas, middle spot often smaller than laterals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baetis intercalaris
3. Pronotum with 2 submedian dark bilobed marks; abdominal sterna with robust setae. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baetis tricaudatus
pronotum without dark bilobed marks; abdominal sterna without robust setae. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baetus brunneicolor
Baetis rusticans is not known as the nymph. Baetis armillatus
Key to Ohio Baetis Nymph Species