Description and natural history of Costa Rican dragonfly larvae. 1. Heteragrion erythrogastrum Selys, 1886 (Zygoptera: Megapodagrionidae)

Based on field collected and (in part) laboratory reared material of various instars (incl. exuviae), the larva is described, illustrated, and compared with that of H. albifrons Ris. The 2 spp. can be differentiated by body size, ocelli position, and by the shape of the central gill. Some notes on the larval habitat are added.