NATURAL SCIENCES OF PHILADELPHIA. 
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polygonal plates. Scales of back small, granular; those of belly large, square, 
in transverse series. Tongue broad, linear, not retractile, firmly attached ex- 
cept at tip, which is only slightly notched, the base not emarginate. Surface of 
tongue with a series of oblique converging ridges on each side. Teeth simple, 
pleurodont. Digits with one series of transverse smooth lamellae beneath, 
Xantusia, Baird. — Body slender ; cylindrical. Femoral pores. Three folds 
on the throat, the anterior connecting the ears inferiorly and encircling the 
head. Pupil vertical. No eyelids. 
Xantusia vigilis, Baird. — Hind leg extended forwards, reaches the first gular 
fold, and is contained about 2| times in head and body. Claws small. Color 
above dark brownish yellow, varied with blackish spots on single tubercles. 
Young vermiculated with yellowish on a brown ground. A yellowish line on 
each side of the neck, with two others on the nape, making four parallel ones. 
Under parts whitish. Head and body about two inches long. 
Hah.— Foit Tejon, Cal. John Xantus. Type No. 3063. 
Family LACERTID^. 
Cnemidophorus inornatuSj Baird. — Scales on the gular fold, smaller than those 
on the breast anteriorly, and scarcely larger than those on the middle of the 
chin. Scales of back tubercular and elevated. Hind feet about two-fifths the 
head and body. General color light greenish olive, paler beneath. No lines 
OD the body. 
New Leon. Lt. Couch. Type No. 3032. 
Cnemidophoi'us octolineatus^ Baird. — Gular fold as in the last. Hind foot not 
two-fifths the head and body. Scales of back depressed. General color light 
greenish olive, paler beneath. Back with eight equidistant and approximated 
light lines. 
JIab.— New Leon. Lt. Couch. Type No, 3009. 
Family ZONURID^. 
Geirhonotus webbii, Baird. — Tail 2} times the head and body. Scales strongly 
carinated. Dorsal scales in 48 transverse rows. Body encircled by 26 rows of 
scales, of which 12 are ventral. Hind feet longer than from snout to ear. 
Above leaden olivaceous brown, lighter beneath. Back with ten or twelve 
blackish bars, bordered in front by brownish or reddish yellow, 
Ilab.—Near San Diego, Cal. Dr. Webb. Type No. 3078. 
Gerrhonotus infernalis, Baird. — Dorsal scales carinated in 16 longitudinal rows ; 
ventral in 12. Nasal plate in contact with the 2d labial only. Tail twice as 
long as head and body. 51 transverse rows of scales from head to tail. Color 
clear light olive, with 8 cross bars of dusky. Beneath yellowish, marbled faintly 
with dull olive. Head plain. 
Ilab. — Devil's River, Tex. Mex, Boundarv Survey. Dr, Kennerly. Type 
No. 3090. 
Gerrhonotus oUvaceus, Baird. — No single frontal, A series of three pairs of 
plates between the vertical and rostral, becoming successively smaller. Two 
post-nasals ; one loral. 39 transverse rows of scales on back from head to tail. 
12 longitudinal rows above ; the 6 central, strongly carinated. Color dark olive 
green, with a series of faint dusky bars. Beneath greenish white. 
Ilab. — Near San Diego. Mex, Boundary Survey, A, Schott. Type No. 3096. 
Lipidosternon floridanum^ Baird. — Body as thick as a large goose quill. No 
limbs. A large pentagonal plate on the head above, encircled by nine others, 
the rostrum ending in a broad horizontal crescent, overhangiog the mouth. No 
ears nor visible eyes. Tail contained 18 times in the body, much depressed, its 
upper surface with large tubercles. Color white in alcohol. 
Micanopy, Florida. Dr, J. B. Barratt. Type No. 3202, 
1858.] 
