MEXICAN TAILLESS AMPHIBIANS 



49 



directed black stripe from each parietal crest; underparts brownish, 

 with light spots; head-and-body length, 63.5 mm. 



No. 3524: Parietal crests abnormally swollen, with internal pro- 

 jections or buttresses, and separated posteriorly from parotoid glands; 

 interval between supraciliary crests 7.8 mm.; parotoid glands pro- 

 tuberant, somewhat elongate or ovoidal, and peculiarly marked with 

 light spots; parotoid glands measure 14 mm. in length and 9 mm. in 

 width; subarticular tubercles distinct; numerous supernumerary tu- 

 bercles on soles of fore and hind feet; a narrow black 

 interorbital band; a light mark in middle of back; 

 underparts brown, with numerous light spots; head- 

 and-body length, 75 mm. 



A third specimen (N.M.W. No. 1869. I. 6) from 

 Mexico was found in Vienna. This individual like- 

 wise has very thick enlarged parietal crests, a heavy 

 supratympanic crest, a thick supraciliary crest, and 

 ovoidal parotoid glands. 



The original specimen on which the description 

 of Bu^o occipitalis Camerano was based is thought 

 to be in the Zoological Museum at Turin, Italy, and 

 is said to be labeled as having come from "Mexico." 

 The type specimen could not be located at the time 

 of my visit to this museum in April, 1930, In 1921, 

 Dr. E. R. Dunn collected a fifth specimen of this 

 species (M.C.Z. No. 8362) at Jalapa in Vera Cruz. 

 The characters used in the key for Mexican species of Biifo are based 

 on this specimen. 



The large swollen parietal branches of the supraciliary crests will 

 at once distinguish this species from any other Mexican toad. The 

 supraciliary crests are high and converge anteriorly. The postorbital 

 crests are rather thick. The large protuberant ovoidal or sub triangular 

 parotoid glaaids are often bicolored, black laterally and grayish above. 

 Small conical warts are scattered over the skin of the upperparts and 

 the upper surfaces of the fore and hind limbs. The tympanum is small, 

 less than one-half the diameter of the eye, and often is rather indistinctly 

 outlined. This species seems to be most closely related to Bufovalliceps. 



Specimens examined. — Four, as follows : 



Bufo cristalus 



Figure 9.— Head of Bufo 

 cristatus (M.C.Z. No. 

 8362) from Jalapa, Vera 

 Cruz, Mexico: a. Lat- 

 eral view; 6, dorsal view 



1 Cotypes. 



