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1.         Left mandible with a high thumblike dorso-lateral projection (Fig. 1.1); prominent notch on the             anterior border of the frontoclypeal apotome (Fig. 1.2). Rare in Ohio; found in primary                         headwaters. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diplectrona metaqui

            Left mandible without a dorso-lateral projection, at most a carina (Fig. 1.3), and anterior edge             of frontoclypeus straight or convex (Fig. 1.4). . . . . . . . . . . . . . . . . . . Diplectrona modesta