4. Posterior band on sternum 8 narrowest medially, gradually widening sublaterally; foretarsal claws with denticles; lateral projections on abdominal segment 9 usually as long as or longer than on 8; setae dense over much of outer margins of cerci; armature on dorsal surfaces of forefemora predominately acute spinelike or elongate setae; matrue larvae
1. Lateral projections present on abdominal segments anterior to 6 (Fig.1.1). . . . . . . . . . . 2
Lateral projections absent on abdominal segments anterior to 6 (Fig.1.2). . . . . . . . . . . . 7
2. Each maxillary crown with less than 10 (usually 0) hair setae (Fig. 1.3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S. mediopuntatum
Each maxillary crown with 10 or more hair setae (Fig. 1.4). . . . . . . . . . . . . . . . . . . . . . 3
3. Ventral abdominal pattern consisting of dark bands (occasionally interrupted medially) extending transversely across posterior margins of at least sterna 5-8; 2-5 spinelike setae on maxillary crown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Ventral abdominal segments without dark posterior crossbands on sterna 5-8; sterna 5-8 with maculations variable or absent; 2-8 spinelike setae on maxillary crown . . . . . . . . . 5
10-18 mm long . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S. luteum (in part)
Posterior band on sternum 8 approximately same width across most of segment (Fig.1.9); foretarsal claws without denticles (Fig.1.10); lateral projections on abdominal segment 9 shorter than on 8; 2-4 spinelike setae on maxillary crown; setae sparse or lacking on outer margins of cerci; armature on dorsal surfaces of forefemora often predominately
oval-shaped setae; mature larvae 9-10 mm long. . . . . . . . . . . . . . S. vicarium (in part)
5. Abdominal terga 2-7 with distinct crossbands on posterior 1/4 of segments forming a sharp contrast with pale areas (Fig.1.11). . . . . . . . . . . . . . . . . . . . S. vicarium (in part)
Abdominal terga 2-7 not as above; posterior bands much narrower or absent. . . . . . . . . 6
6. Foretarsal claws with denticles (Fig.1 12); 2-4 spinelike setae on maxillary crown; mature larvae 9-10 mm long . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S. luteum (in part)
Foretarsal claws without denticles; 2-8 spinelike setae on maxillary crown; mature larvae 10-14 mm long . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7. Maxillary crown with less than 10 (usually 0) hair setae (Fig. 1.10). . . . . . . . . . . . . . . . . 8
Maxillary crown with 10 or more hair setae (Fig. 1.11). . . . . . . . . . . . . . . . . . . . . . . . 128. Mesonota with conspicuous large pale spots or complete pale band at wing pad bases . . . . (Fig 1.12). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S. exiguum
Mesonota without large pale spots or complete pale band at wing pad bases. . . . . . . . . . 9
9. Maxillary crowns with 1-8 hair setae . . . . . . . . . . . . . . . . . . . . S. terminatum (in part)
Maxillary crowns with 0 hair setae. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
10. Terminal sternum with brown posterior margin . . . . . . . . . . . S. terminatum (in part)
Terminal sternum with pale posterior margin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
11. Abdomainal sterna 4-7 with brown lateral longitudinal markings and anterior stripes or dashes extending obliquely laterad; abdominal tergum 7 mostly dark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S. terminatum (in part)
Abdominal sterna 4-7 without above dark markings; abdominal tergum 7 variable in color . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
12. Abdominal tergum 7 mostly white (Fig. 1.16); foretarsal claws with denticles (Fig. 1.17); maxillae each with 5 or 6 spinelike setae on crown. . . . . . . . . . . . . . . . . S. pulchellum
Abdominal tergum 7 mostly dark; foretarsal claws with or without denticles (usually without); maxillae each with 2-6 spinelike setae on crown . . S. terminatum (in part)
13. Abdominal sterna 3-8, 4-8, 5-8 or 6-8 with distinct pattern of oblique crossbars . . . . . . 13
Abdominal sterna with above pattern, if crescent-shaped crossbars present, then on 7 and/or 8 only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
14. Foretarsal claws not denticulate; maxillae each with 15-35 hair setae on crown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S. ithaca (in part)
Foretarsal claws denticulate; maxille each with 15-50 hair setae on crown . . . . . . . . . . 15
15. Maxillae each wtih 30 or less hair setae on crown . . . . . . . . . . . . . . . . S. ithaca (in part)
Maxillae each withmore than 30 hair setae on crown . . . . . . . . . . . . . . . . S. modestum
Key to Ohio Stenonema Nymph Species
