87 



PHRYNOSOMA CORXUTA.— //«r/«». 



Plate XI. 



Characters. Head short, thick, triangular, rounded in front, with a range 

 of long spines on each side of the lower jaw; nostrils open within the internal 

 margin of the supercihary ridge; body short, flattened, rounded, covered with 

 trihedral tubercles, intermixed with small imbricated scales; abdomen flattened, 

 and covered with rhomboidal, carinated scales; femoral pores, but not well 

 developed. 



Synontmes. Lacerta tapayaxin, Barton, Med. and Phys. Journ., vol. iii. part ii. p. 68. 

 Agama cornuta, Harlan, Journ. Acad. Nat. Scien. Philad., vol. iv. p. 299, pi. sx. 

 Tapaya orbicularis, Cuvier, Reg. An., torn. ii. p. 37. 

 Phrynosoma cornuta, Gray, in Griff. An. King., vol. ix. p. 45. 

 Phrynosoma Harlani, TViegmann, Herp. Max., pars i. p. 54. 

 Phrynosoma Harlani, Dumeril et Bibron, Hist. Nat. des Rept., torn. iv. p. 314. 

 Agama cornuta, Harlan, Med. and Phys. Res., p. 141. 

 Horned Toad, Vidgo. 



Description. The head has nearly the form of an equilateral triangle, rounded 

 at the snout, and covered on the vertex with small polygonal scales, all nearly of 

 the same size; the occipital plate is small and sub-round; the remaining parts of 

 the occipital space is covered with small scales and small conical pointed 

 tubercles, sometimes grooved. The rostral plate is small, pentagonal, and 

 rounded above. The nasal plates are single on each side, circular, narrow, 

 surrounded by five or six small polygonal scales, with the opening for the nares 

 nearly in the middle. 



