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1.        Respiratory tubes of abdominal segment 8 widely separated. . . . . . Nigronia serricornis (Say)

          Respiratory tubes of abdominal segment 8 nearly touching at base. . . . . . . . . . . . . . . . . . . . . . . . . .           . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nigronia fasciatus (Walker)

 

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Key to Nigronia Nymphs Species

From Rasmussen & Pescador, 2002