368 TRIID &. 
Cnemidophorus marmoratus, Baird § Gir. Proc. Ac. Philad. 1852, 
. 128. 
= gracilis, Baird & Gir. lc. p. 128, and U.S. Mex. Bound. Surv. 
ii., Rept. pl. xxxiv. figs. 7-14. 
undulatus, Hallow. Proc. Ac. Philad. 1&54, p.94, and Rep. U.S. 
Explor. Surv. R. R. x. part iv. 1859, p. 8, pl. ix. fig. 2. 
tessellatus, Baird, Rept. U.S. Explor. Surv. R. R. x. pt. iv. 
. 18, 
ane sackii, Cope, Proc. Ac. Philad. 1862, p. 23. 
Cnemidophorus melanostethus, Cope, op. cit. 1863, p. 104. 
sexlineatus, var. sackii, Bocourt, Miss, Sc. Mex., Rept. p. 276, 
pl. xx. c. fig. 6. 
sexlineatus, var. grahamii, Boe. 1. c. p. 277, pl. xx. fig. 8. 
—— sexlineatus, var. tessellata, Giinth. Biol. C.-Am., Rept. p. 26, 
Head moderate. Three parietals; four supraoculars; seven 
supraciliaries ; no frenoorbital; median gular scales gradually en- 
larged ; mesoptychium with three or four rows of enlarged scales, 
the posterior largest, scarcely or not larger than the largest gulars ; 
the mesoptychial scales forming the border of the collar or separated 
by one row of granules. Dorsal granules small, smooth. Ventral 
plates in eight longitudinal rows, those of the outer row largest of 
all; thirty-one to thirty-three transverse rows. Three large pre- 
anals, forming a triangle. Four or five rows of brachials, anterior 
largest, continuous with the postbrachials ; antebrachials continuous 
with brachials, in three rows, the outer of which is the largest, the 
median the smallest; slightly enlarged scales under the forearm. 
Fight to ten rows of femorals, one of which is large ; tibials in three 
rows, outer largest. Femoral pores nineteen to twenty-two. Caudal 
scales broad, very oblique, with straight keels, slightly pointed 
posteriorly. Olive-grey above, spotted or marbled with black, with 
or without more or less defined light longitudinal lines ; lower sur- 
faces yellowish, the belly spotted with black. 
millim. millim. 
Total length .......... 450 From end of snout to fore 
Head: sevavaiewawaws 38 Limb: cea e-ak Seinen 57 
Width of head.......... 25 From end of snout to vent 140 
From end of snout to inter- Fore limb evsse ee keine 50 
parietal plate ........ 27 Hind limb............ 93 
Width at posterior corners Taal ba .ae wend eras: 310 
of supraocular regions... 14 
South-western North America. 
a,b. dg. California. 
6. Cnemidophorus mariarum. 
? Cnemidophorus grahamii, Baird § Gir. Proc. Ac. Philad. 1852, 
p. 128, and U.S. Mex. Bound. Surv., Rept. pl. xxxii. figs. 1-6, 
Cnemidophorus mariarum, Giinth. Biol. C.--Am., Rept. p. 28, pl. xx. 
Head narrow. Nostril anterior to nasal suture. Three parietals ; 
four supraoculars ; seven supraciliaries; a frenoorbital; median 
