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Se describen la larva de tercer estadio y las pupas de macho y hembra de Coelosis biloba (Linné 1767) con ejemplares recolectados en Colombia (Cauca y Valle) y en México (Veracruz) asociados con los hormigueros de Atta cephalotes (Linné 1750). Se incluyen ilustraciones de las estructuras diagnósticas, una clave para separar las larvas de tercer estadio hasta ahora conocidas de la tribu Oryctini en América, y observaciones sobre la biología de C. biloba como inquilino de los nidos de hormigas.The larva of third instar, male and female pupae of Coelosis biloba obtained inside ant nests of Atta cephalotes in Colombia (Cauca, Valle) and Mexico (Veracruz) are described. Drawings of diagnostic structures, a key to the known third instar larvae of American Oryctini, and observations on the biology of C. biloba as inquiline of ant nests, are included.

THE LARVA OF THIRD INSTAR, MALE AND FEMALE PUPAE OF COELOSIS BILOBA OBTAINED INSIDE ANT NESTS OF ATTA CEPHALOTES IN COLOMBIA (CAUCA, VALLE) AND MEXICO (VERACRUZ) ARE DESCRIBED. DRAWINGS OF DIAGNOSTIC STRUCTURES, A KEY TO THE KNOWN THIRD INSTAR LARVAE OF AMERICAN ORYCTINI, AND OBSERVATIONS ON THE BIOLOGY OF C. BILOBA AS INQUILINE OF ANT NESTS, ARE INCLUDED.