Cyclocephala lunulata is a frequent scarab species in Colombian agroecosystems, but its biology is widely unknown. Aiming to describe the immature stages and to study some biological aspects related to its life cycle, distribution and agricultural importance, parents of the species were collected from two dry tropical forest areas [Palmira and El Cerrito, in the Colombian Cauca-Valley (800-1000 mm/year)] and confined in vessels with fruits and organically enriched soil. The larvae are distinguished, due to the maxilla with 3 terminal unci, the smaller medial one with * recibido abril 22 de 2010, aceptado junio 4 de 2010 1 Candidato a doctor en Ciencias Agropecuarias, docente universidad del Cauca. e-mail: rstechauner@unicauca.edu.co 2 IA, M.sc, Ph.d, Catedratico universidad nacional, sede Palmira. e-mail: pardolc@gmail.com ISSN 0123 3068 bol.cient.mus.hist.nat. 14 (1): 203 220