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Two new glyptodonts are described for Costa Rica. The species Glyptotherium cf. arizonae and the dwarf glyptodont Pachyarmatherium leiseyi. This last species which was fi rstly recorded for the Upper Pliocene of Florida; its fi nding represents the southernmost record for Central America of these species.

ABSTRACT:The genus Rhynchotherium has been described as a fossil for the Upper Miocene of Guatemala and volcanic deposits of Nicaragua, the Upper Miocene and Pliocene fluvial sediments of El Salvador and Honduras, but this is the first time it is recorded from Costa Rica. The material described includes a partially preserved skull with three upper molars. The material has been collected from a single locality, Santa Rita, near San Vito Town in the Puntarenas Province.