Abstract
Chrysonotomyia (Achrysocharella) is represented in North America by three species groups. The formosa group includes damastes (Walker), formosa (Westwood), and ovulorum (Ratzeburg); the punctiventris group includes punctiventris (Crawford), gracillariae n. sp., hyphantriae n. sp., and borealis n. sp.; and the diastatae group includes diastatae (Howard). Keys, descriptions, host records, and comparison of the subgenera Achrysocharella Girault and Chrysonotomyia Ashmead are included. New synonymies and new combinations of names representing material incorrectly placed under Achrysocharella are also included.

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