Two new scarab beetles from the southwestern USA (Coleoptera: Scarabaeidae: Melolonthinae and Aphodiinae)

Resumen

Phyllophaga (Listrochelus) benwarneri new species and Cinacanthus cunninghami new species(Coleoptera: Scarabaeidae) are described from dune systems in northern Arizona and extreme southern Nevada, USA. Habitus and diagnostic characters of these species are illustrated, and couplets from the respective, most recent (sub)generic keys are modified to incorporate the new species. Available habits and habitat information for each species, and a discussion of the Phyllophaga “senex complex” of species are provided.