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Some larvae species of rhizophagous beetles constitute themselves in a serious phytosanitary problem in several agricultural regions of Colombia as they conform communities, both harmful and innocuous, but apparent morphologic similarities makes it difficult to differentiate them, limiting the field diagnosis. To contribute to the study of this problem, samplings of one of the most abundant collected species, Cyclocephala larvae, were made, in crops of six towns of Antioquia and one of Caldas. To facilitate positive adult observation, larvae were individually numbered. In all, eighty two larvae of Cyclocephala fulgurate, C. lunulata and C. gregarious were collected and their characteristic and diagnostic features described and illustrated. From a matrix of seventy characters, six cranial quetotaxic, maxilar and tarsungular characters were used to make a taxonomic key to identify the third-instar larvae.

Morfología de estados inmaduros de tres especies de Cyclocephala (Coleoptera: Melolonthidae) con una clave para larvas de tercer estado en Colombia