The third instar and pupa of Canthon bispinus Germar are described and illustrated. The larvae were reared from eggs laid by adults under laboratory conditions. Morphology of the two stages is analyzed based on characters at the generic level and compared to that of other species of Canthon Hoffmansegg. The third instar of C. bispinus can be distinguished by unique combination of chaetotaxy on the head, epipharynx, and mandibles and the number of stridulatory teeth on the maxilla. The setose pedium of the epipharynx is the main characteristic that differentiates the larva of C. bispinus from others in the genus. The morphology of both the larva and the pupa of C. bispinus conform with those characters diagnostic for the genus.