1897.] LIZARDS OP THE GENUS SCELOPORITS. 515 



light streaks aud symmetrical dark markings, exactly as in 

 S. scalaris. Lower parts, in the male, much spotted with black 

 in addition to the blue ventral patches, the throat and belly some- 

 times nearly entirely blackish blue. 



Hab. Mexico. Eecorded from the States of Vera Cruz, Puebla, 

 and Jalisco. 



25. SCELOPORUS SCALARIS. 



Sceloporus scalaris, Wiegm. Isis, 1823, p. 370, and Herp. Mex. 

 p. 50, pi. viii. fig. 2 (1834) ; Bocourt, Miss. So. Mex., Eept. p. 202, 

 pi. xviii. bis, fig. 9 (1874) ; Cope, Proc. Am. Philos. Soc. xxii. 

 1885, p. 394; Bouleug. Cat. Liz. ii. p. 234 (1885); Duges, 

 Naturaleza, (2) i. 1887, p. Ill ; Giinth. Biol. C.-Am., Eept. p. 73 

 (189U). 



Tropidolepix scalaris, Gray, Grriff. A. K. ix, Syn. p. 44 (1831), and 

 Zool. Beechey's Vov. p. 95, pi. xxx. fig. 3 (1839) ; Dam. & Bibr. 

 Erp. Gen. iv. p. 310 (1837) ; Gray, Cat. Liz. p. 210 (1845). 



Head-shields keeled or striated ; frontal transversely divided, in 

 contact with the interparietal, which is as long as broad or longer 

 than broad ; parietals very small, or broken up into scales ; a more 

 or less regular series of feebly enlarged transverse supraoculars, 

 bordered inwards by one series of scales aud separated from the 

 supraciliaries by two or three series ; two canthal scales ; anterior 

 border of ear very slightly denticulated. 



Dorsal scales larger than ventrals, strongly keeled, sharply 

 pointed, forming parallel longitudinal lines ; 33-48 scales between 

 the interparietal shield and the base of the tail, 6-10 corresponding 

 to the leogth of the shielded part of the head. Lateral scales 

 nearly as large as dorsals, more or less distinctly keeled, forming 

 straight or very slightly oblique longitudinal series. Ventral 

 scales smooth, mostly bicuspid. 34-46 scales round the middle of 

 the body. 



The adpressed hind limb reaches the axilla, the shoulder, 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 ear or the collar- 

 fold. 13-20 femoral pores oa each side, meeting or narrowly 

 separated on the praeanal region. 



Caudal scales as large as or larger than dorsals, strongly keeled. 

 Males with enlarged postanal scales. 



Tellowish brown, reddish, or olive above, with four regular 

 series of large crescentic brown spots, the series separated by more 

 or less well-defined light longitudinal lines or stripes ; head with 

 symmetrical dark brown markings; a black or deep blue spot, 

 often with a light blue centre, in front of the arm. Male 

 yellowish white beneath, the throat spotted with blackish or with 

 oblique blackish lines converging posteriorly; an elongate deep 

 blue patch on each side of the, belly. Female uniform yellowish 



