49. scELoporvs. 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 hrown cross-bands ; lower surfaces yellowish 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. 
millim. millim. 
Total length ...... 120 Width of head .... 10 
Head (to posterior From snout to vent. 54 
border of occipital) 11 
Mexico. 
8. Sceloporus melanorhinus. 
Sceloporus melanorhinus, Bocowrt, Journ. Zool. v. 1876, p. 341, and 
Ann, Se. Nat. (6) 1. 1876, art. 12; Cope, Proc. Am. Philos. Soc. 
xxii, 1885, p. 395. 
Head-shields smooth ; a seriés of four transversely dilated supra- 
oculars; two canthal 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. Philad. 1863, p. 105, and 
Proc. Am. Philos, Soc. xxii. 1885, p. 395. 
clarkii zosteromus, Cope, Chech-List N. A. Rept. p. 49, 
—— rufidorsum, Yarrow, Proc. U.S, Nat. Mus. v. 1882, p. 442. 
Closely allied to S. spinosus. Parietals wider than occipital, 
which is not wider than long. Auricular scales much longer than 
those adjacent. The adpressed hind limb reaches the orbit. _ Fe- 
moral pores more than ten. Male above bright olivaceous, with a 
reddish longitudinal dorsolateral band on each side, crossed medially 
by numerous indistinct brown bars, often obsolete ; under surfaces 
and sides of tail yellowish ; anterior face of femur, groin, a large 
VOL, II. Qa 
