49. SCELOPORFS. 225 



base of the tail ; nine scales correspond to the shielded part of the 

 head ; lateral scales keeled, pointed, directed obliquely upwards and 

 backwards ; ventrals smooth, entire. Limbs short, tibia as long as 

 the shielded part of the head. Thirteen to fifteen femoral pores. 

 Caudal scales a little larger than dorsals, strongly keeled. Male 

 with enlarged postanal scales. Brownish olive above, with a double 

 series of narrow dark brown spots on the vertebral zone ; sides with 

 oblique light lines ; a broad blackish, light-edged scapular collar ; 

 limbs and tail with brown cross-bands ; lower surfaces yellowisli in 

 the female, the throat striped with bluish ; males with the throat 

 bluish, with concentric darker lines, and the sides of the belly blue, 

 black-edged internally. 



milliui. inillim. 



Total length 120 Width of head 10 



Head (to posterior From snout to vent. 54 

 border of occipital) 1 1 



Mexico. 



8. Sceloporus melanorhimis. 



Sceloporus melanorhimis, Bocourt, Journ. ZooL v. 1876, p. .341, and 

 Ann. Sc. Nat. (G) iii. 1870, art. 12; Cojx', Proc. Am. Philus. Soc. 

 xxii. 1885, p. 39o. 



Head-shields smooth ; a series of four transversely dilated supra- 

 oculars ; two cauthal scales ; occipital broader than long, and as 

 broad as the parietals ; anterior border of ear rather feebly denti- 

 culated : dorsal scales much larger than ventrals, keeled and ending 

 in a strong point, not denticulated; six scales correspond to the length 

 of the shielded part of the head. Eighteen to twenty femoral pores. 

 Caudal scales smaller than dorsals. No enlarged postanal scales in 

 the male. Ochreous above, tinged with greenish on the flanks, with 

 or without a dorsal series of rhomboidal brown spots ; end of snout, 

 lips, and sides of neck dark brown ; males with the throat and the 

 sides of the belly cobalt blue, the chin black. 



Size of S. spinosus. 



Tehuantepec, Colima. 



9. Sceloporus zosteromus. 



Sceloporus zosteromus, Cope, Proc. Ac. Philud. ]80;5, p. 105, and 

 Proc. Am. Philos. Soc. xxii. 1885, p. o95. 



clarkii zosteromus, Cope, Check-List N. A. Rept. p. 49. 



rufidorsum, Yarrow, Proc. U.S. Nat. Mi<s. v. 1882, p. 442. 



Closely allied to S. sjnnosus. Parietals wider (ban occipital, 

 which is not wider than long. Auricular scales much longer than 

 those adjacent. Tbe adprcssed hind limb reaches the orbit. Fe- 

 moral pores more than ten. Male above bright olivaceous, with a 

 reddish longitudinal dorsolateral band on e;ich side, crossed medially 

 by numerous indistinct brown bars, often obsolete ; under surfaces 

 and sides of tail yellowisli ; anterior face of femur, groin, a large 



VOL. II. 



