1897.1 



LIZABDS OE THE GBJTOS SCELOPOIIUS. 



487 



U.S. Geol. Surv. Montana, p. 468 (1.872) ; Yarrow, in Wheeler's 

 Rep. Explor. W. 100th Mer. v. p. 574 (1875) ; Cope, Proc. Amer. 

 Philos. Soe. xxii. 1885, p. 395; Bouleng. Cat. Liz. ii. p. 229 

 (1885) ; Gunth. Biol. O.-Am., Kept. p. 69 (1890) ; Vaa Denburgh, 

 Proc. Cal. Ac. (2) v. 1895, p. 113. 



Sceloporus tristichus, Cope, in "Wheeler's Rep. Explor. W. 100th 

 Mer. V. p. 571. 



Scelojjorus garmani, Bouleng. Proc. Zool. Soc. 1882, p. 761, 

 pi. Ivi. 



Head-shields smooth ; frontal transversely divided, in contact 

 with the interparietal or separated from it bj a small azygous 

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

 larger than the parietals ; a series of four or live transversely 

 enlarged supraoculars, the widest not measuring more than half 

 the width of the supraocular region, bordered inwards by one . 

 series of scales and separated from the supraciliaries by two or 

 three ; two canthal scales ; three to five pointed scales, longer 

 than those in front of them, form a denticulation on the anterior 

 border of the ear. 



Dorsal scales much larger than ventrals, as long as broad, 

 strongly keeled, slightly mucronate, tricuspid, the keels forming 

 parallel lines ; 38-47 scales between the interparietal shield and 

 the base of the tail ; 7 to 10 scales, taken in the middle of the 

 back, correspond to the length of the shielded part of the head. 

 Lateral scales graduating into dorsals and ventrals, keeled, pointing 

 upwards and backwards. Ventral scales smooth, bi- or tricuspid. 

 42-46 scales round the middle of the body. 



The adpressed hind limb reaches the axilla or the cervical fold ; 

 tibia slightly shorter 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 posterior border of the ear. 12-18 femoral pores on each side. 



Caudal scales as large as or a little larger than dorsals, strongly 

 keeled and shortly mucronate. Males with enlarged postanal 

 scales. 



Reddish brown above, with a greyish vertebral band and one or 

 two yellowish lateral bands on each side ; dark brown spots 

 between the longitudinal bands; a blackish streak at base of 

 humerus. Lower parts yellowish white, uniform in the female ; 

 male with a small blue spot on each side of the throat, and an 

 elongate black-margined blue blotch on each side of the belly, the 

 white interspace between them measuring twice their width. 



Hab. This species was originally described from the Red River 



