1. Maxillae galealacinia with submedian longitudinal row of setae consisting of less than 30 setae. . . 2
Maxillae galealacinia with submedian longitudinal row of setae consisting of mre than 30 setae. . . 5
2. Abdominal terga uniformly brown, without pale longitudinal markings or stripes; abdominal sterna entirely pale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stenacron carolina
Abdominal terga with pairs of pale stripes or markings submedially and to some extent sublaterally; usually some distinct markings on posterior abdominal sterna. . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Angulate (left) mandible with inner margin of outer incisor having five to seven denticles. . . . . . . .4
Angulate terga with inner margin of outer incisor having eight denticles. . . . . . Stenacron candidum
4. Abdominal terga with submedian longitudinal stripes continuous or nearly continuous; maxillae galealacinia with 20-30 setae in submedian row and with 8-10 comblike setae on crown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stenacron interpunctatum
5. Maxillary crowns with 8-10 robust setae in form of distally comblike setae; abdominal sterna with dark bands or spots laterally. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stenacron minnetonka
[Note: the maxillary crown is the distal margin of the main body of the maxilla from the outer curvature to the tip.]
Maxillary crowns with 11-13 robust setae in form of laterally comblike setae; adominal sterna without dark markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stenacron gildersleevei
Key to Ohio Stenacron Nymph Species