CHECKLIST OF REPTILES OF MEXICO 31 



Genus PSEUDEMYS Gray 



Pseudemys Gray, Proc. Zool. Soc. London, 1855 (1856), p. 197. 



Type. — Testudo concinna LeConte. 



Species. — About 8, and a total of about 22 species and subspecies, 

 of which 8 forms occur in Mexico. 



Range. — The United States east of the Rocky Mountains, Baja 

 California, both coasts of Mexico from the Rio Grande on the east 

 and southern Sonora on the west southward to Argentina. 



KEY TO MEXICAN SPECIES OP PSEUDEMYS 



1. Ridge on alveolar surface of upper jaw distinctly toothed; temporal stripe 



absent or not expanded 2 



Ridge on alveolar surface of upper jaw not toothed; temporal stripe or spot 

 much expanded 3 



2. A strong notch at apex of upper jaw, flanked on each side by a toothlike projec- 



tion; teeth on alveolar ridge long, numerous; nostrils terminal; snout not 



pointed, obtuse floridana texana (p. 33) 



No notch at apex of upper jaw, and no subterminal toothlike projections; teeth 

 on alveolar ridge smaller, less numerous; nostrils pierced below and posterior 

 to tip of snout; snout pointed, acuminate umbra (p. 33) 



3. A light, round temporal spot, completely isolated from orbital markings _ _ 4 

 Supratemporal light spot elongate, reaching orbit 5 



4. Temporal light spot completely isolated, not continuous with lines either 



anteriorly or posteriorly; bridge with longitudinal black stripes. 



scripta gaigeae (p. 33) 



Temporal light spot continuous toward rear with longitudinal light stripe; 



bridge black spotted scripta nebulosa (p. 32) 



5. Markings solid, intensely black, replacing or obscuring a linear juvenile pat- 



tern, and including a broad area along middle of plastron, lengthwise along 

 middle of bridge, and on posterolateral corners of the marginal scutes above 

 and below; these markings evident in bony plates as well as in epidermal 



scutes scripta hiltoni (p. 32) 



Markings not as described 6 



6. Plastral markings always present, either smudged, or, if in lines, the lines 



forming ocelli; supratemporal stripe, if visible, reaching eye. 



scripta elegans (p. 32) 



Plastral markings, if visible, not smudged, but in lines that tend to be arranged 



longitudinally, not ocellate; supratemporal stripe reaching eye or not 7 



7. Dark ocellus of each costal scute nearest latter's posteroventral corner. 



scripta cataspila (p. 32) 

 Dark ocelli nearest posterodorsal corners of costals scripta omata (p. 31) 



PSEUDEMYS SCRIPTA OKNATA (Gray) 



Emys omata Gray, Synopsis reptilium, 1831, p. 30. — Bocourt, Mission scientifi- 

 que au Mexique . . . , fitudes sur les reptiles, livr. 1, 1870, pi. 3, fig. 1, la. 



Pseudemys scripta ornata, Carr, Herpetologica, vol. 1, 1938, p. 135, figs. 3, 4, 5. 



Emys venusta Gray, Catalogue of the shield reptiles . . . , vol. 1, 1855, p. 24, 

 pi. 24a (type locality, Mexico, Honduras and America, here restricted to 

 Honduras; types in Brit. Mus.). 



Type. — Brit. Mus., two cotypes. 



