A new species of Callistethus from Mexico (Coleoptera, Melolonthidae, Rutelinae)

callistethus tlapanecus, a new species collected in pine forest located at 2160 meters of altitude in eastern mountains of the state of guerrero, mexico is described. the morphological characters that distinguish it from other mexican and central american species are discussed. the diagnostic characters are illustrated, and a key to mexican species of callistethus is also included.