The Neotropical genus Marbenia Malloch is revised and now includes 3 species: Marbenia cinerea, sp. nov., Marbenia pallida, sp. nov. and Marbenia peculiaris Malloch, 1931. The genus is herein recorded from the amazonian region of South America (Bolivia, Brazil and Ecuador), and characters of male and female terminalia are illustrated for the first time.
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