CROCODILIANS, LIZARDS, AND SNAKES. 



551 



of the iiiitcrior aspects of the fore leg aud feiiiui- larger than the 

 others; those of the tibia small, aud those of the posterior face of the 

 feiimr still smaller. Scales of the tail in whorls of equal width. The 

 scales of equal size aud all couvex in cross section, but not keeled. 

 None of the scales of the body or limbs keeled. 



The nostril is situated in a small scute at the junction of the sutures 

 which separate the internasal, rostral, first labial, and first loreal scuta. 

 Three loreals, increasing 

 in size posteriorly. A cir- 

 cle of scales surrounds 

 the eye, of which the supe- 

 rior, or superciliary, are 

 the largest. Tlie latter are 

 separated by one row of 

 scales from the parietal, 

 frontoparietal, and frontal 

 on each side. The fronto- 

 nasal is nearly square. 

 The internasals are con- 

 siderably in contact. The 

 frontal is hexagonal, and 

 is broader than long. The 

 interparietal is as large as 

 each parietal. It is longer 

 than wide, and notches the 

 contact of the frontopari- 

 etals. The occipitals are 

 large and quadrate. A sin- 

 gle large temporal bounds 

 the parietals and occipital, 

 and it is followed by two 

 small scuta, which are in 

 contact with the occipital. 

 A triangular plate inter- 

 venes between the occip- 

 ital aud parietal. There 

 are eight scales on the 

 ui»per lip. Of these the 



fifth is the largest, and is i)art of an annulus which begins with two 

 small scales at the posterior loreal and terminates at the seventh scale, 

 opposite the middle of the pupil posteriorly. The posterior labials are 

 small and are separated by nine rows of still smaller scales fron) the 

 large temporal. No larg'e auricular scales. The eye is rather large, 

 and its diameter is contained in the length of muzzle in front of it 1.75 

 times. Tiie vertical diameter of the auricular meatus is a little less. 



The first digits ot' both extremities are verv short. The second of 



Fig. 99. 



Xantusia riversiana Cope. 



X ^. ■ 



Santa Catalhia I-slaud, Calilbruia. 



Kiinn typi. in .Mus.-uni, University of California 



