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A checklist of the Scarabaeoidea (except Passalidae) of the Guianas (Guyana, Suriname and French Guiana) is presented for the first time. Both recorded and potential species are included, the latter defined as being recorded from Brazil north of the Amazon/Rio Negro main channel or from Venezuela east of the Orinoco main channel. The checklist contains a total of 930 species and subspecies, with 265 validly recorded from Guyana (eight new country records), 388 from Suriname (146 new country records), 531 from French Guiana (four new country records) and 177 additional species recorded from contiguous areas of neighboring Brazil and Venezuela. Valid names as well as selected synonyms are provided. Multiple notes on presently recognized subspecies, nomenclatural problems, doubtful type localities, historical misidentifications, etc. are included. An extensive reference list is provided.
In the course of working on new species of North American Phyllophaga Harris, 1827 (Coleoptera: Scarabaeidae: Melolonthinae) some synonyms have been found and are proposed here. New synonymies: Phyllophaga knausii (Schaeffer, 1907) is synonymized with Phyllophaga sociata (Horn, 1878); Phyllophaga chippewa Saylor, 1939 is synonymized with Phyllophaga rugosa (Melsheimer, 1845); and Phyllophaga falta Sanderson, 1950 is synonymized with Phyllophaga bipartita (Horn, 1887). Lectotypes are here designated for the following species: Listrochelus knausii Schaeffer, Listrochelus sociatus Horn, and Lachnosterna bipartita Horn. A neotype for Ancylonycha rugosa Melsheimer is here designated from the Horn Collection.