Abstract

The genus Oedematopus Van Duzee is revised. Oedematopus shannoni Van Duzee, 1930 and Oedematopus transversus Van Duzee, 1930 are synonymized with Oedematopus vidua (Becker, 1922), and Oedematopus moraviensis sp. nov. is newly described. The closely related new genus Oedematopiella, including Oedematopiella sarae sp. nov. and Oedematopiella nathaliae sp. nov., is established. Oedematopiella differs from Oedematopus mainly by wing venation and the male postadomen. Keys to tribes and genera of Neotropical Hydrophorinae and to species of Oedematopus and Oedematopiella are provided.

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