CHECKLIST OF THE AMPHIBIA OF MEXICO 31 



Skull normally well ossified in adults 3 



3. Maxillary-premaxillary series of teeth not greatly reduced in males 



(more than half) ; tails distinctly longer than head and body 4 



Maxillary-premaxillary teeth greatly reduced in adult males, usually 

 less than half number of teeth in females 6 



4. Teeth larger, curved; arms touch or overlap when adpressed; digits more 



dilated at tips; maxillary-premaxillary series about 21 on each side; 



females darker on venter than males; arboreal arborea (p. 32) 



Teeth not especially large or curved 5 



5. Digits less dilated at tips; maxillary-premaxillary tooth series about 34 



in females, 25 in males; teeth not elongate or noticeably curved; males 



and females white below; terrestrial or arboreal multidentata (p. 32) 



Maxillary-premaxillary tooth series 25 to 31; vomerine teeth 8 to 13; 

 limbs overlap width of 2 costal folds; second finger longer than fourth; 

 terrestrial mosaueri (p. 32) 



6. Adpressed limbs touch or overlap in both sexes; maxillary-premaxillary 



teeth 25 in adult females, 5 to 8 in adult males; vomerine teeth about 



6; arboreal lavae (p. 32) 



Adpressed limbs separated usually in both sexes (may touch in xolocalcae 

 males) 7 



7. Surface of head not roughened, not flattened especially; terrestrial 8 



Head flattened, the surface somewhat roughened; adpressed limbs sepa- 

 rated by about one costal fold in females, may touch in males; vomerine 

 teeth 13 on each side; maxillary-premaxillary teeth 36 on each side 



in females; arboreal solocalcae (p. 33) 



8. Adpressed limbs separated by from 2 to 4 costal folds; females about 24 



maxillary-premaxillary teeth on each side, males 6 to 8; vomerine teeth 



6 or 7; larger chiroptera (p. 32) 



Adpressed limbs separated by from 1}^ to 3 costal folds; females 25 to 27 

 maxillary-premaxillary teeth, males 13 or 14; vomerine teeth 4 or 5; 

 smaller terrestris (p. 33) 



CHIROPTEROTRITON DIMIDIATA (Taylor) 



Bolitoglossa dimidiata Taylor, Univ. Kansas Sci. Bull., vol. 26, 1939 (1940), pp. 



408-411, figs. 1-2. 

 Chiropterotriton dimidiata Taylor, Univ. Kansas Sci. Bull., vol. 30, 1944, p. 216. 



Type.— EUT-UMS No. 17677. 



Type locality. — Guerrero, near Mineral del Monte, southern Hidalgo, 

 Mexico. 



Range. — Hidalgo. Known only from the type locality and the 

 nearby El Chico National Park. 



CHIROPTEROTRITON CHONDROSTEGA (Taylor) 



Bolitoglossa chondrostega Taylor, Univ. Kansas Sci. Bull., vol. 27, 1941, pp. 113- 



115. 

 Chiropterotriton chondrostega Taylor, Univ. Kansas Sci. Bull., vol. 30, 1944, 



p. 216. 



Type.—EWY-WsiS No. 17304. 



Type locality. — Durango, Hidalgo, Mexico, elevation 5,000 to 6,000 

 feet. 



i?an^e.— Northern Hidalgo. Known only from the type locality. 



