MEXICAN TAILLESS AMPHIBIANS 



185 



the axilla; side of head below can thus rostralis and shoulder dark; 

 dark cross bands on hind limbs, and when femur, tibia, and tarsus 

 are folded back at right angles to long axis of body, the ends of these 

 dark crossbars meet and simulate a continuous band. The other 

 cotype (B.M. No. 1883. 4. 5. 3) does not differ in any essential detail 

 from the preceding specimen and has a body length, snout to vent, 

 of 29.8 mm. 



The key prepared by Cope ^^ in 1889 to distinguish oxyrrhinus from 

 variolosus apparently was incorrectly drawn up from memory, for the 

 heel of oxyrrhinus does not reach to end of the muzzle, and the sides 

 of variolosus are blackish brown anteriorly, as stated in the original 

 description. In describing oxyrrhinus, Boulenger observes that the 

 heel or tibio-tarsal joint reaches to between the shoulder and the eye. 

 The distinctions made by Cope do not exist. Giinther ^^ correctly 

 placed H. seebachii and H. oxyrrhinus in the synonymy of //. variolosus. 



A juvenile specmien (M.N.B. No. 7585) collected by Adolphe 

 Boucard in Mexico is described in my notes as follows: Head-and- 

 body length, 20 mm.; the hind limb being carried forward along the 

 body, the tibio-tarsal joint reaches to the eye; very large subarticular 

 tubercles on fingers and toes; inner metatarsal tubercle quite large, 

 the outer one smaller, but larger than the subarticular tubercles; 

 skin of underparts minutely areolate; a quite narrow dark interor- 

 bital stripe; remainder of upperparts (in alcohol) grayish; a black 

 stripe along canthus rostralis from tip of snout to eye, and from eye 

 to above tympanum and to behind the latter on the sides; upper 

 anterior surface of thighs pink; dark cross bands on hind limbs indis- 

 tinct; underparts dark, with numerous closely spaced minute light 

 spots. 



Specimens examined. — Seven, as follows: 



Hypopachus variolosus 



1 Cotypes of Hypopachus oxyrrhinus. 

 ' Type of Engystovia variolosum. 



M Cope, E. D., U. S. Nat. Mus. Bull. 34, p. 388, 1889. 



" Gunther, A. C. L. G., Biologia Centrali-Americana, Reptilia and Batrachia, p. 211, Feb., 1900. 



