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1.         Hypostoma apparently fused with hyposomal bridge that loses head capsule ventrally, its
            anterior margin bilobed; mandible with a single outer tooth; prolegs prominent ventrally on first
            3 abdominal segments, each with a conspicuous curved claw. Coloration rusty red or black . .
            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bittacomorpha claviceps

            Hypostoma separated from hypostomal bridge, its anterior margin multitoothed; mandible with
            3 large outer teeth; prolegs and apical curved claws small and inconspicuous; coloration pale
            yellow or brown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ptychoptera sp.

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Key to Genera of Ptychopteridae Nymphs

From Courtney & Merritt, 2008