49, sckLoports. 235 
frequently with oblique blackish lines converging posteriorly ; an 
elongate deep-blue patch on each side of the belly in the male. 
millim. millim. 
Total length ..... 148 Fore limb ........ 25 
Head ............ 15 Hind limb...... . 40 
Width of head .... 125 atl atieececae wees x 85 
BOOS oka algae 48 
Mexico to Sonora and South-western Texas. 
a-b. 2. Altisco. 
c-d, Her. & ye. Hacienda del Hobo. P. Geddes, Esq. [P.]. 
e, f-g, h-k. 3G. Mexico. 
19. Sceloporus pyrrhocephalus. 
Sceloporus pyrrhocephalus, Cope, Proc. Ac. Philad. 1864, p. 177, and 
Proc. Am. Philos. Soc. xxii, 1885, p. 394. 
Head-shields smooth ; one canthal scale; a series of five trans- 
verse supraoculars ; occipital large, much broader than long ; parietals 
exceedingly small; scales of ear-fringe a little larger than those 
anterior to them. Dorsal scales much larger than ventrals, strongly 
keeled, unimucronate, converging to the middle line, in about 
twenty-five transverse series from nape to crural region; lateral 
scales larger than abdominals ; of the latter a portion only slightly 
emarginate. Femoral pores twelve. Tail much compressed. 
Greenish brown, with a broad black band from the scapular region 
to the groin, light bordered above; below yellowish, sides bluish ash 
to near the median line, on each side of which is a series of from 
seven to nine transverse blue bars; upper labial and gular region 
striped with a series of black or bluish lines, which converge pos- 
teriorly on a paler or deeper yellow ground; top of head bright 
chestnut-red or brown. 
millim millim. 
Head............ 13 Hind limb........ 36 
Body os vache aw es 45 BOOB 4s cece aka: 15 
Fore limb... .... 24 
Colima, Mexico. 
20. Sceloporus chrysostictus. 
Sceloporus chrysostictus, Cope, Proc. Ac. Philad. 1866, p. 125, and 
Proc. Am, Philos. Soc, xxii. 1885, p. 394. 
? Sceloporus cupreus, Bocourt, Miss. Se. Mex., Rept. p.210, pl. xviii. bis. 
fig. 2. 
Head-shields keeled or striated; two (or one) canthal scales; a 
series of four or five large transverse supraoculars ; occipital broader 
than long ; parietals very small, one or two on each side; anterior 
border of ear very feebly denticulated. Dorsal scales much larger 
than ventrals, strongly keeled, simply pointed, forming slightly 
oblique longitudinal lines; forty to foryt-five scales between the 
