101 



PHRYNOSOMA DOUGLASSIL— ^e//. 



Plate XIV. 



Characters. Head short, triangular, pointed and covered with tubercles, and 

 not spines, on the posterior part, nostrils open at the anterior extremity of the 

 superciliary ridge; body elongated, rounded, flattened, covered above with scales 

 and slightly elevated and pointed tubercles, below with smooth scales; femoral 

 pores, eighteen on each thigh. 



Synonymes. Agama Douglassii, Bdl, Linn. Trans., vol. xvi. p. 105, tab. x. pi. 105. 

 Phrynosoma Douglassii, TVagler, Natiirlich. S3'st. der Amphib., p. 146. 

 Plirynosoma Douglassii, TViegmaun, Hcrp. Mex., pars i. p. 54. 

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



Description. The head is short, triangular, flattened above, with its frontal, 

 vertical, as well as occipital regions covered with closely imbricated polygonal 

 scales; two shghtly elevated tubercles only are seen on the latter region. The 

 rostral plate is very small and triangular; the nasal plates are single on each side, 

 very thin, and surrounded by five or six small scales. The nostrils are lateral, 

 situated at the anterior extremity of the superciliary ridge, and are directed 

 upwards and a little outwards. The superciliary ridge projects horizontally over 

 the eye, more so than in any other Phrynosoma, and is covered with six large 

 superior orbital plates, and terminates posteriorly in a small tubercle, very slightly 

 pointed. The eye is small, sunken and black; the eyelids are equally movable, 

 and covered with minute scales. There are ten superior labial plates, quadri- 

 lateral, and all nearly of the same size; the inferior labial plates are seven in 

 number, quadrilateral, and larger than in any of the genus. Behind these labial 



