226 CTSTIGNAIHIBJS. 



greenish above, with large insuliform, light-edged olive spots ; some- 

 times vinaoeous red lines between the spots. Male with a subgular 

 vocal sac. 



E. S. America. 



a-b. (3 $ . Buenos Ayres. Oh. Darwin, Esq. [P.]. (Types.) 



c. 5 . Buenos Ayres. E. "W. White, Esq. [P.]. 



d. 5 . Parana. 



8. Ceratophrys americana. 



Pyxioephalus americanus, part., Cfunih. Cat. ■a. 24. 

 Pyxicephalus americanus, Dum. Sf Bibr. p. 446 ; BeU, Zool. Beagle, 

 Mept. p. 40, pi. 18. f. 2 ; IfOrbigny, Am4r. merid. v. p. 10, pi. 14. 

 f. 1-4 ; JEspada, Viaj. Pacif., Vertebr. p. 20. 



Vomerine teeth in two straight groups a little behind the choanse. 

 Head moderate, not bony ; nostril equally distant from the eye and 

 the tip of the snout ; eyelid normal ; interorbital space flat, narrower 

 than the upper eyelid ; tympanum hidden. First finger longer than 

 second ; toes one-third webbed ; subarticular tubercles well deve- 

 loped ; inner metatarsal tubercle very large, shovel-shaped, black- 

 edged ; a short tarsal fold. The hind limb being carried forwards 

 along the body, the metatarsal tubercle does not reach the eye. Skin 

 tuberclar above and beneath ; a few elongated glands on the back, 

 Olive above, with large, insuliform, light-edged spots ; a light ver- 

 tebral stripe. 



E. 8. America. 



a. 2 • Montevideo. 



b. Yg. Montevideo. Charles Darwin, Esq. [P.]. 

 c-d. cJ ? • Buenos Ayres. E. W. "White, Esq. [C.]. 



9. Ceratophrys cultripes. 



Pyxicephalus americanus, part., Qunth. Cat. p. 24. 

 Odontophrynus cultripes, JReinh. ^ IMk. Vidensk. Meddel. 1861, 



p. 159, pi. iii. f. 1. 

 Pyxicephalus cultripes. Cope, Proc. Ac. Philad. 1863, p. 61. 



Vomerine teeth in two, slightly oblique series between the 

 choanse. Head moderate, not bony; nostril a little nearer the 

 eye than the tip of the snout ; upper eyelid simple ; interorbital 

 space scarcely concave, a little narrower than the, upper eyehd; 

 tympanum hidden. First finger longer than second ; toes one-third 

 webbed; subarticular tubercles well developed; inner metatarsal 

 tubercle very large, shovel-shaped, brown-edged; a very distinct 

 tarsal fold. The hind limb being carried forwards along, the body, 

 the metatarsal tubercle does not reach the eye. Skin tubercular 

 above and beneath ; two or three parotoid-like glands on each side of 

 the neck and front part of the back; a large parotoid-like gland on 



