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1.        Hemelytral commissure with a definite hair-lined pit at anterior end; antennae 3-segmented. . . .            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Buenoa sp.

           Hemelytral commissure without a definite hair-lined pit at anterior end; antennae 4-segmented.            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Notonecta sp.

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Key to Notonectidae Genera