1897.] 



LIZAEDS OF THE GEXUS SCELOPOEUS. 



489 



with the interparietal or separated from it by tbe frontoparietals ; 

 interparietal as long as broad, a little longer than broad, or a little 

 broader than long, broader than tbe parietals, which are divided 

 into two ; a series of four large transverse supraoculars, bordered 

 inwards by an incomplete series of scales, the last two shields 

 being in contact with the frontoparietals and pai'ietals, and 

 separated from the supraciliaries by one or two series of scales ; 

 two canthal scales ; three to six long pointed scales on the anterior 

 border of the ear. 



Dorsal scales much larger than ventral s, as long as broad or 

 broader than long, feebly keeled, not or but very shortly mucronate, 

 strongly denticulate, the keels forming parallel series or very 

 slightly converging towards the median Ime ; 30 ' to 35 scales 

 between the interparietal shield and the base of the tail; 6 or 7 

 scales, taken in the middle of the back, correspond to the length 

 of the shielded part of the head. Lateral scales nearly as large as 

 dorsals and more strongly keeled, directed obliquely upwards and 

 backwards. Ventral scales small, suiooth, bi- or tricuspid. 36 to 

 38 scales round the middle of tbe body. 



The adpressed hind limb reaches the shoulder or the ear ; tibia 

 longer than the shielded part of the head ; the distance between 

 the base of the fifth toe and the extremity of the fourth exceeds 

 the distance between the end of the snout and the ear. 11 to 15 

 femoral pores on each side. 



Caudal scales as large as dorsals, strongly mucronate. Males 

 with enlarged postanal scales. 



Dark bronzy brown above, uniform or the scales pale olive in 

 the centre, or pale brown with dark brown cross-bands, the dark 

 bands broader than the pale interspaces. Lower parts leaden 

 grey in females, pale blue in young males, blackish blue in adult 

 males. 



Hab. San Diego Co., California. The British Museum has also 

 received a specimen among a collection of Eeptiles from Arizona, 

 presented by Dr. W. Gr. Wright. 



10. SCELOPOBUS SPINOSUS. 



Scelojjorus spinosus, "Wiegm. Isis, 1828, p. 370, and Herp. Mex. 

 p. 50, pi. vii. fig. 3 (1834) ; Baird,U.S. Mex. Bound. Surv., Eept. 

 p. 5, pi. xxix. figs. 4-6 (1859) ; Bocourt, Miss. Sc. Mex., Eept. 

 p. 174, pi. xviii. fig. 2 (1874) ; Cope, Proc. Araer. Philos. Soc. 



