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1.         Mesonotum with 2 or 3 sclerites (sometimes hard to see); head with ventromesal margins of             genae not thickened, posterior median ventral ecdysia line about 1.5 times as long as each             anterior divergent branch; anal opening without dark, sclerotized line on each side. . . . . . . . 2

            Mesonotum without sclerites (Fig. 1.1); head with ventromesal margins of genae thickened . .             (Fig. 1.2), posterior median ventral ecdysial line about a long a each anterior divergent branch             (Fig. 1.3); anal opening with dark, sclerotized line on each side (Fig. 1.4). . . . . . Glossosoma

2.         Mesonotum with 2 sclerites; ventral apotome of head not slender, broader laterally;                         widespread. Only one species in Ohio. . . . . . . . . . . . . . . . . . . . . . . . Agapetus tomus Ross

            Mesonotum with 3 sclerites; ventral apotome of head slender, parallel-sided sclerite. Only one             species in Ohio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Protoptila maculata (Hagen)