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Homophileurus neptunus Dechambre was found to be conspecific with H. waldenfelsi Endrödi after examination of types, descriptions, and illustrations. Accordingly, H. neptunus is placed in junior synonymy with H. waldenfelsi, new synonymy. Homophileurus waldenfelsi is an uncommon species and occurs in Ecuador, Colombia, Brazil, and Peru. Brazil and Peru are new country records.
The five genera and eight species of dynastine scarabs occurring in the Cayman Islands in the West Indies are reviewed. Two new, endemic species are described from Little Cayman, with supporting illustrations: Tomarus adoceteus Ratcliffe and Cave (Pentodontini), new species, and Caymania nitidissima Ratcliffe and Cave (Phileurini), new genus and species.
Five new species of Orizabus Fairmaire from Mexico and Guatemala are described, illustrated, and compared with other Orizabus species: O. amalgamatus Ratcliffe and Cave, O. delgadoi Ratcliffe and Cave, O. epithecus Ratcliffe and Cave, O. mezclus Ratcliffe and Cave, and O. thomasi Ratcliffe and Cave. An identification key and a checklist of the species in the genus Orizabus are provided.