362 APPENDIX C. — KEPTILES. 



belly proportionally larger than in any other species, smooth, 

 quadrangular, and trapezoidal. Femoral pores conspicuous ; the 

 series from right and left coming into contact on the middle line 

 of the belly, and forming a curve, the convexity of which is turned 

 backward toward the vent. The lower surface of the body is uni- 

 color. 



Phrynosoma douglassii, Gray. 

 Pl. VII. Fig. 6-9. 



Syn. Phrynosoma douglassii, Gray, Synops. Kept, in Griff. Anim. Kingd. IX. 



1831, 44.— Wagl. Nat. Syst. Amph. 1830, 146.— Wiegm. Herp. Mex. 1834, 



54.— HoLBR. N. Amer. Herp. I. 1842, 101, PI. XIV.— Gray, Cat. Brit. Mus. 



1845, 227. 

 Agama douglassii, Bell, Trans. Linn. Soc. L. XVI. (1828), 1833, 105, PI. X.— 



Harl. Med. and Phys. Research. 1835, 141, fig. 3. 



The specimen figured is not the largest of the species, but being 

 the only one secured at Salt Lake, we took it in preference to any 

 of those which we have from California and Oregon. It is about 

 three inches and a-half long ; the head is a little less than a fifth 

 of the entire length. The body, from the neck to the origin of 

 the hind legs, is about of the same length as the remaining pos- 

 terior portion. The body is suborbicular, being nearly as broad 

 as long. These dimensions may vary to some degree among 

 different individuals, but, generally speaking, they give to the 

 species its specific character as far as the form and outlines of 

 the body are concerned. Viewed from above (fig. 6), the body is 

 subtriangular, as broad behind as long ; acuminated, but rounded 

 in front. The vertex is cordiform, a little depressed in the middle, 

 forming over the eyes a prominent carina, composed of four or 

 five elongated plates, and posteriorly terminated by a blunt spine 

 or acute knob. The occipital region, immediately behind, is de- 

 pressed, and provided with three acute knobs, the central one in- 

 conspicuous. The temporal region is bordered posteriorly by 

 three or four spines or subpyramidal plates. The auditory aper- 

 ture is vertically oblong or semilunated. The nostrils are pro- 

 portionally very large, and situated at the anterior prolongation 

 of the superciliary ridge. The polygonal plates are very minute 

 on the nasal region and all along the upper jaw ; the marginal 

 row, however, being a little more conspicuous. The profile (fig. 7) 

 exhibits the characters just alluded to, and gives a perfect picture 

 of the physiognomy of this species. The eyes are oval. The same 

 figure 7 exhibits the double row of large scales of the lower jaw. 



