LACERTILIA IGUANIDAB SCELOPORUS JAEROVII. 



569 



UTA SYMMETRICA, Baird. 



TJta symmetrica, BD., Proc. Acad. Nat. Sci. Phila., 1858, 253. Id., U. S. & Mex. Bound. 

 Surv., pt. ii, 1859, Reptiles, 7. COPE, Proc. Acad. Nat. Sci. Phila., 1866, 303. 



HAB. Sonorau Subregion. 



Abundant in Arizona, and particularly noticeable for mimicry of color 

 dependent upon localities where found. 



Genus SCELOPORUS, Wiegmann. 



SCELOPORUS JARROVII, Cope, sp. nov. 

 PLATE XXIII, FIGS. 2, 2b, 2c, 2d, 



Sceloporus jarrovii, COPE, Check-List N. A. Batrach. & Rept., 1875, 48 (no description). 



The following description of this beautiful and interesting species is by 

 Prof. E. D. Cope, to whom the specimens were submitted for examination. 



" Scales of moderate size, gradually increasing in size from the ventral 

 to the dorsal region, very weakly keeled, and not mucronate above, entire 

 below, except on the pectoral and gular regions, where they bear an apical 

 notch. Thirty transverse series between the interscapular and middle 

 sacral regions. Scales of the superior faces of the limbs keeled. The large 

 transverse supraorbital shields separated from the frontals by one, and 

 from the superciliaries by two, series of scales. Six internasals, five pre- 



