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1.        Adults with metathoracic tympanal organs, without scales at the base of proboscis. . . . . . . . .            . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Noctuidae, Bellura

           Adults with abdominal tympanal organs, with scales at base of the proboscic. . . . . . . . . . . 2

2.        Haustellum (proboscis) short, rudimentary, or missing; spedies with brachypterous wings in            some females; male with normal wings. . . . . . . . . . . . . . . . . . . . . Acentria ephemerella

           Haustellum (proboscis) normal length; wings usually fully developed in males and females. . 3

3.        Hindwing with M2 present. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

           Hindwing with M2 absent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4.        Antennae strongly annulated. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Parapoynx

5.        Antennae with at most weakly raised scale-rows on each segment dorsally. . . . . . Petrophila

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