New species of Aphodiinae from Mexico and a key to species of Cephalocyclus Dellacasa, Gordon and Dellacasa (Coleoptera : Scarabaeidae)

Two new Mexican species of aphodiine Scarabaeidae are described: Ataenius p araperforatus new species (Eupariini), based on specimens of both sexes col lected in mesophilous cloud-forest of Xilitla, Queretaro State, Jacala, Hid algo State, and Totutla, State of Veracruz; and Cephalocyclus stebnickae ne w species (Aphodiini), based on two male specimens captured in a Pinus Quer cus forest near Teopisca, Chiapas State. Ataenius paraperforatus is compare d to A. perforatus Harold. important taxonomic characteristics of both Atae nius as well of the new Cephalocyclus are illustrated. A key for the identi fication of the seven known species of Cephalocyclus and comments on the sp ecies distribution in Mexico is additionally presented.