[Description of two new Mexican species of Aphodius of the subgenera Platyderides and Trichonotulus (Coleoptera: Scarabaeidae: Aphodiinae) associated with Pappogeomys merriami (Rodentia: Geomyidae).] Folia Entomologica Mexicana, 94 1996: 41-55. 44 [Zoological Record Volume 133]