TFIE GEN^US CNEMIDOPHORUS. 33 



striped form of the C. tessellatus and C. sexUneatus, which have but one series of 

 such spots. The femur and tibia are crossbarred, and the former is not marked with 

 a longitudinal stripe behind. 



Cnemidophorus tessellatus Say. 



Baird, U. S. Pac. R. R, Surveys, Vol. X, 1859, Guanison's Report, p. 18. 



Cope, Check List Batr. Rept. N. Araer., 1875, 46. 



Amiva tessellaia Say, ia Longs. Exped. Rocky Mts., 1823, I[, p. 50. 



Scales of the back and sides generally coarse, .05 mm. in diameter. Scales of 

 the collar not larger than those of the throat, the edge of the collar with smaller often 

 granular scales. Four supraorbital scales, the ppstei'ior smaller than the others. 

 These are separated from both the superciliaries and the frontal and frontoparietal by 

 granular scales whose extension anteriorly differs in different individuals. Fronto- 

 parietals as large as the parietals, truncate in front. Interparietal longer than broad, 

 longer than each parietal. The latter undivided. A transverse series of small plates 

 bound the parietals and interparietals posteriorly. Frenal plate longer than post- 

 nasal. One row of scuta in front of orbit, and below orbit, separating the latter from 

 the superior labials. Superior labials five to below middle of orbit, the fifth acumi- 

 nate posteriorly. Infralabials five. 



Brachial scales in four to eight longitudinal rows (rarely five) counted at the 

 middle, continuous with antebrachials, which are in three rows (rarely two). Post- 

 antebrachials small, uniform. Femoral plates in seven to nine rows (counted at 

 middle and to the line of pores) and tibial plates in three longitudinal rows. Femoral 

 pores varying from nineteen to twenty-one in number. 



Color varying from olivaceous black to olivaceous brown, which is marked by 

 light yellow or orange longitudinal stripes or spots on the dark ground, or reversed 

 by black spots on a light ground. The head is unspotted and unstriped, except 

 occasional maculations of the gular region. Belly from yellowish to black or spotted. 

 Limbs crossbarred or spotted, and not distinctly striped posteriorly. 



The size varies from a length of head and body of 8G m. to 102 mm. In the 

 former the total length is 260 mm. ; in the latter, 850 ram. For more detailed mea- 

 surements see under the respective subspecies. 



This species ranges over the Sonoran and Lower Californian regions and the 

 Pacific, nearly to the northern boundary of California. Its distribution is somewhat 

 coincident with that of the Eutijenia elegans (omitting the Rocky mountains proper), 

 and its eastern border is overlapped by the range of the eastern C. sexlineatus. The 



A. p. S. VOL. XVII. E. 



