THE GENUS CNEMIDOPHORUS. 43 



the C tessellatustessellafus. But two specimens are known, and one of these has five 

 and the other six infralabial plates. They are from Western Texas, between San 

 Antonio and El Paso. 



Cjstemidophoeus GULATiis Bd. Gird. 



Proceeds. Acad. Phila., 1853, p. 128. 



Baird, U. S. Mex. Boundary Survey, Reptiles, PI. XXXIV, Figs. 1-6. 



Cnemidophorus guttatus Hallowell, Proceeds. Acad. Phila., 1854, p. 193. 



This species is allied to the C sexlitieatus, but is distinguished by the presence 

 of postantebrachial plates, the more nnmeroas femoral pores and the longer muzzle. 

 It is very variable as to size and color, but the dark spaces between the light stripes 

 are always marked, interrupted or completely broken up by light spots or spaces, 

 except in the young. The color variations are similar to those already mentioned 

 under the head of the C. tessellatas but they are more numerous. Specimens from 

 Western Texas come nearest in character to the C. sexUneatus. It takes the place of 

 that species throughout Mexico, also replacing the C. tessellatus in the drier parts of 

 that country. Besides the characters already cited, this species differs from the C. 

 tessellatus in its finer scales. These measure from .25 to .3J mm. in diameter, while 

 those of the C tessellatus measure .5 mm.; but this character does not always 

 hold good. 



The subspecies of the Caemidopliorus gularis differ as follows : 



Stripes persistent, narrow, defined; no black spots; femoral scales in 6-8 rows; hind legs yel- 

 low spotted, and with a stripe behind ; smaller O. g. gularis. 



Stripes persistent, wide, ragged ; spots in interspaces irregular ; parietal plate very narrow ; muz- 

 zle elongate ; legs neither spotted nor striped ; large ; 8 rows femoral scales ; 6 infraiabials, 



G. g. angusticeps. 



Stripes vanishing, their interspaces with black crossbirs ultimately joining crosswise ; femoral 

 scales 8-10 ; hind legs spotted ; infraiabials 5-6 ; large G. g. mariarum. 



Stripes broken up into rows of spots ; interspaces with yellow spots ; hind legs with or without 

 yellow spots ; no posterior femoral stripe ; a frenoorbital ; 5-6 infraiabials ; large, 



G. g. communis. 



Light stripes traceable anteriorly only ; black bands broken up into transverse spots by orange 

 spots on body ; hind limbs pale spotted ; femoral scales 7-8 rows ; infraiabials generally 6 ; 

 medium G. g. scalaris. 



Anal plates 3-4 ; femorals in 8-9 rows ; femoral pores 31 ; 6 infraiabials ; large scales of collar 

 equal ; stripes posteriorly obsolete ; interspaces in front spotted ; medium C g. sericeus. 



No light stripes ; olivaceous with three rows of black spots on each side on anterior fourth of 

 body; femorals 8; infraiabials 6; muzzle elongate; limbs unspotted ; medium, 



G. g. semifasciatus. 



