1.         Preanal plate present and tergal plates on body segments rather uniformly sized, 2 such plates
            on each of thoracic and 1st abdominal segment and 3 plates on each of the following 6
            abdominal segments. . . . . . . .   . . . . . . . . . . . . . . . . . . . . . . . . Pericoma, Telmatoscopus

            Preanal plate absent or tergal body plates general reduced in sie or only on some segments, or             fewer than 26 plates present. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Psychoda

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Flies (Diptera) of Ohio

Key to Psychodidae Nymph Genera

From Courtney & Merritt, 2008