1. Tracheae of gills with conspicuous lateral branches. Gills 2-7 forked at one-forth or more . length from base. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Tracheae of gills without such conspicuous lateral branches. Gills 2-7 forked near base. . 3
2. Gills 3-5 forked about midlength or slightly less from base. . Neoleptophlebia adoptivaGills 3.5 forked at one-forth to one-third length from base. . . . Neoleptophlebia mollis
3. Second and third joints (distal 2 segments) of maxillary palp together are 1 1/3 to 1 1/2 times the length of the first joint (proximal segment). . . . . . . . . . . . . . . . . . . . . . . . . . 4
Second and third joints of maxillary palp together about equal the first joint in length. . . 6
4. Postero-lateral angles of gill-beariing segments with a black spot on the margin . . . . . . . 5
Postero-lateral angles of gill-bearing segments with a black streak along margin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paraleptophlebia strigula
5. Abdominal tergites largely dark brown, with narrow pale submedian streaks at anterior margin; legs wholly pale . . . . . . . . . . . . . . . . . . . . . . . . . . Paraleptophlebia guttata
Abdominal tergites largely yellowish with irregular brown markings; a dark brown "knee spot" on each leg, and partial dusky band near apex of femur. Paraleptophlebia ontario
6. Legs pale, barred with darker brown . . . . . . . . . . . . . . . . . . Paraleptophlebia debilis
Legs uniform brown, or nearly so . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. Gills hairy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paraleptophlebia volitans
Gills not hairy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7. Segments of abdomen nearly twice as wide as long . . . . . . Paraleptophlebia moerens
Seg8ments of abdomen nearly equal in length and width . Paraleptophlebia praepedita
Key to Ohio Paraleptophlebia and Neoleptophlebia Nymph Species