1897.] LIZABDS OF THE GENUS SCELOPORUS. 507 



connecting dorsals with brachials ; dorsal scales keeled, pointed, 

 with a well-pronounced notch on each side of the point, 47 to 51 

 scales between occipital and tail, 9 to 11 in a head length; 

 femoral pores 16 to 18 on each side, not meeting medially ; tail 

 about eight times the length of the head ; distance between base 

 of fifth toe and extremity of fourth, including claw, less than 

 distance from nostril to arm, and much more than from snout to 

 posterior margin of ear ; no colour bands across nape ; no longi- 

 tudinal colour bands ; males with dark blue patches on flanks and 

 one on each side of thi'oat ; females similarly marked, but colours 

 less vivid and less extended." 



Total length 199 millim. ; head to occiput 15 ; snout to vent 

 75 ; fore limb 34 ; hind limb 52, 



Hab. Painted Desert, Arizona. 



18. SCELOPOETJS GEATIOSUS. 



Sceloporus gratiosiis, Baird & Grir. Proc. Ac. Philad. 1852, p. 69, 

 and in Stansb. Exped. Gr. Salt Lake, p. 346, pi. v. figs. 1-3 (1852) ; 

 Cope, in Hayden's Rep. U.S. Geol. Surv. Montana, p. 468 (1872), 

 and Proc. Am. Philos. Soc. xxii. 1885, p. 395 ; Bouleng. Cat. Liz. 

 ii. p. 230 (1885); Giinth. Biol. C. Am., Eept. p. 71 (1890); 

 Stejneger, N. Am. Faun. no. 3, 1890, p. Ill, and no. 7, 1893, 

 pt. ii. p. 183. 



Sceloporus qracilis, Baird & Gir. Proc. Ac. Philad. 1S")2, p. 175 ; 

 Girard, U.S. Explor. Exped., Herp. p. 386, pi. xx. figs. 1-9 (1858) ; 

 Bocourt, Miss. Sc. Mex., Eept. p. 190, pi. xviii. fig. 4 (1874). 



Sceloporus jalapcK, Giinth. I.e. p. 74. 



Sceloporus vanclenburgianiis. Cope, Amer. Nat. 1896, p. 834. 



Head-shields smooth ; frontal transversely divided, in contact 

 with the interparietal or separated from it by the frontoparietals ; 

 interparietal large, broader than long ; parietals small or broken 

 up into scales ; foiu* to six transversely enlarged supraoculars, 

 bordered inwards by one series of scales and separated from the 

 supraciliaries by two or three series ; four or five slightly enlarged 

 pointed scales form a denticulation on the anterior border of the 

 ear. 



Dorsal scales small, a little larger than ventrals, strongly keeled, 

 pointed or slightly mucronate, forming parallel longitudinal lines ; 

 52-56 scales between the interparietal shield and the base of the 

 tail, 11-16 corresponding to the length of the shielded part of the 

 head. Lateral scales a little smaller than dorsals, keeled, directed 

 obliquely upwards and backwards. Ventral scales smooth, more 

 or less, distinctly bicuspid. 50-58 scales round the middle of the 

 body. 



The adpressed hind limb reaches the ear or between the shoulder 

 and the ear ; tibia as long as or slightly longer than the shielded 

 part of the head ; the distance between the base of the fifth toe 

 and the extremity of the fourth equals the distance between the 

 end of the snout and the anterior extremity, or the middle of the 

 collar-fold. Eemoral pores 14-18 on each side, 



