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1.         Lateral spines of abdominal segment 9 reaching ends of anal appendages or beyond; five palpal             setae, 5 promiinent premental setae, 1-2 less prominent premental setae; abdominal segment             10 without middorsal hook. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Didimops transversa

            Lateral spines of abdominal segment 9 shorter, not reaching ends of anal appendages; six             palpal setae, 5-6 prominent premental setae, 3-4 less prominent premental setae; abdominal             segment 10 with small middorsal hook. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Macromia

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