u\
11 v a i n i I
R E P T I L E S . 9 7
To these must be added tbe Agama Donglasii o f Mr. Bell. L in . T’rans- xvi. t, 10. Phrynosoma
Douglasii, which has no lateral fringe, and the back scattered with trihedral larger scales.
Thus there are a t least five species o f this genus, which are all pe culia r to America. Specimens of
three are iu the collection o f the British Museum.
L e i o c e p h a l u s c a r i n a t u s , t. 29. f . 3. Gray in Ann. P h il, and in Griffith, Anim.
Kingd. 42.
in h ab . South America.—C ab . Brit. Mus.
C o l u b e r ( n a t r i x ) s u b c a r i n a t a , t. 32.
Above olive b row n ; sides obscurely brown spotted, beneath ye llow ; with a black-edged pale
dorsal band, two h a lf scales wide. T h e body fusiform; the head rather depressed, with one rostral
scale, triangular notched below. Nasal scales triangular, with nostrils pierced in the ir c e n tre ;
with two triangular intema sa l plates, and two rather larger fronto-nasal p la te s ; two frontal and one
nearly equal-sided superciliary scale on each side o f it, and two larger parietal p la te s ; one anterior
and three posterior orbital scales on each side, with a very small triangular scale between the anterior
one and the nasal plate. Mouth very large, gape reaching beyond the eyes. U p p e r lips with eight,
and lower with ten labial scales on each s id e ; the first lower lateral scales on each side very long.
Mental plates, two pairs, the' h inde r largest, with three or four cross series o f gular scales before the
gular plates. The dorsal scales lanceolate, keeied, in about seventeen longitudinal se rie s; the two
c entral series strongly keeled, with the keels diminishing in distinctness, and the scales increasing in
width towards the sides, so tha t tlie scales o f the series next the abdominal plates are hexagonal, as
broad as long, nearly twice as broad as the vertebral scales, and almost smooth. The ventral
plates about one hundred and forty, wide, regularly arched, and yellowish. Tail conical, tapering
slender, about one fourth o f the length o f the body, with eight or nine series of strongly-keeled
hexagonal scales above, and with about seventy pairs of subeaudai plates. Length o f the body,
two f e e t ; o f the ta il, seven inches.
In h ab . common in the hedges o f Xalisco, a province o f Mexico.—Tradescant Lay, E s q .; the specimen
in the Museum o f the College o f S urgeons.
T his species is nearly allied to Coluber bicarinatus of Prince Maximilian of W ied, (Reise in
Brasilien, I . 181), and the N a tr ix bicarinata o f Wagler, (Serp. Braz. t. 7 ; ) b u t the latter describes the
ta il o f his snake as more than h a lf the length o f the body, and the two dorsal series of scales alone
as keeled, and observes th a t the others are six-sided, with a scarcely elevated lin e ; none o f which
characters agree with the specimen unde r consideration.