Revision of the genus Pachystethus Blanchard with description of three new species from Mexico (Coleoptera: Scarabaeidae: Rutelinae: Anomalini)

摘要

Descriptions or redescriptions along with comments on the distribution and habits of six species in the genus Pachystethus are provided. Anómala nutans Bates and A. vidua crassesculpta Bates are transferred to the genus Pachystethus and P. matzapatlecus new species, P. ixtacomitanus new species and P. nectoctenus new species are described from Oaxaca, Chiapas, and Veracruz, Mexico, respectively. Lectotypes for Popillia sticticollis, Anómala nutans, and A. vidua crassesculpta are designated. Color photographs, illustrations of diagnostic characters, and a key to species are also included.