Consideraciones Acerca De La Evolución De Las Piezas Bucales en Los Onthophagini (Coleoptera: Scarabaeidae) en Relación Con Diferentes Regímenes Alimenticios

SUMMARY In order to contrast the hypothesis that different sectors of the trophic spectrum of the Onthophagini could correspond to struc- tural modifications concerning the general scheme of their mouth - parts, several Ontophagini which are strictly associated with ro- dents' burrows or bats' guano were studied. The following species were selected: Onthophagus (s. str.) hippopotamus Bates, exclusive of rodents'