In North American glyptodonts, the identification of the genus Glyptotherium revolves primarily around characters of the carapace. However, previous studies suggest the possibility of a wide range of intraspecific variation. We report two glyptodont specimens from the Mexican states of Tamaulipas and Tlaxcala. We offer a description of their skeletal and carapace elements as well as a brief review of glyptodont distribution in Mexico. Our initial analysis led us to conclude that the glyptodont from Tamaulipas bears similarities to Glyptotherium cylindricum whereas the Tlaxcala specimen resembles Glyptotherium floridanum. However, further study of previously unreported skeletal elements, in association with characters of the carapace, suggested similarity between the two species. Hence we assigned the two glyptodonts to the species G. cylindricum, which has nomenclatural priority. The addition of new morphological characteristics helped to discern synonymy of these two glyptodont species.