Ovomanonychus new genus (Coleoptera: Scarabaeidae: Melolonthinae: Sericoidini) is described based on Ovomanonychus rosettae (Frey, 1976), new combination (type species), Ovomanonychus inajae new species, and Ovomanonychus striatus new species. The genus occurs in Bahia, Mato Grosso, Espírito Santo, Minas Gerais, Paraná, Rio de Janeiro, and São Paulo States, Brazil. Description is provided for the new genus and for its placement in Sericoidini. A key to species is presented along with illustrations, distributional data, and a map for each species.
Keywords: Coleoptera, Manonychus, Neotropics, Brazil, chafers, taxonomy.