CHECKLIST OF REPTILES OF MEXICO 19 



KEY TO MEXICAN FAMILIES OF CRYPTODIRA 



1. Abdominal scutes in contact with marginals or separated from them only by 



membrane; inguinal scute short, less than half length of bridge; 12 plastral 



scutes 4 



All plastral scutes separated from marginals by a series of inframarginals, or 

 inguinal scute very long, half length of bridge or longer; 12 or fewer plastral 

 scutes 2 



2. Four or 5 inframarginals Dermatemyidae (p. 19) 



Two or 3 (rarely 1) inframarginals 3 



3. Bridge very narrow, covered chiefly by the displaced abdominal scutes, which 



are widely separated from each other medially Chelydridae (p. 20) 



Bridge broad, abdominal scutes in normal position Kinostemidae (p. 21) 



4. Digits with no webs whatever; rear foot stump-shaped, plantar surface as 



broad as long Testudinidae (p. 27) 



Digits with at least some vestige of webs; rear foot more elongate, plantar 

 surface longer than broad Emyidae (p. 28) 



Family DERMATEMYIDAE Gray 



Dermatemyidae Gray, Supplement to the catalogue of the shield reptiles . . ., 

 1870, p. 49. 



Genera. — One. 



Range. — Central Mexico to Honduras. 



Genus DERMATEMYS Gray 



Dermatemys Gray, Proc. Zool. Soc. London, 1847, p. 55. 



Chloremys Gray, Proc. Zool. Soc. London, 1870, p. 715 (type, Dermatemys abnormis 



Cope=Z). mawii Gray). 

 Limnochelone Werner, Zool. Anz., vol. 24, 1901, p. 297 (type, Limnochelone 



micrura Werner). 



Genotype. — Dermatemys mawii Gray. 



Range. — Atlantic coast from central Veracruz to Honduras. 



Species. — One recognized. 



dermatemys MAWn Gray 



Dermatemys mawii Gray, Proc. Zool. Soc. London, 1847, p. 55. — Boulenger, 



Catalogue of the chelonians . . ., 1889, pp. 28-29. 

 Emys Berardii Dum^ril and Bibron, in Dum^ril and Dum^ril, Catalogue 



m^thodique de la collection des reptiles, livr. 1, 1851, p. 11 (type locality, 



environs of Veracruz, Mexico; type in Mus. Hist. Nat. Paris). 

 Dermatemys abnormis Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 20, 1868, 



p. 120 (type, U.S.N.M. No. 6545; Belize River, British Honduras). 

 Limnochelone micrura Werner, Zool. Anz., vol. 24, 1901, p. 298 (type locality, 



Mexico, here restricted to Alvarado, Veracruz; type unknown). 



Type. — Brit. Mus. 



Type locality. — Uriknown, here restricted to Alvarado, Veracruz. 



Range. — Rivers of the Atlantic coast from central Veracruz to 

 Guatemala, probably excludmg the northern part of the Yucat§,n 

 Peninsula. Recorded from the states of Veracruz, Oaxaca, Tabasco, 

 Yucatan, and Campeche. 



