•28 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
however, I find that they differ in the following particulars. In the present 
species the head is concave between the eyes, and forwards nearly to the snout ; 
in the other, this part is quite plain ; the scales of the head in this species are 
flat ; in the other they are convex. The colour of this species is uniformly green, 
whereas iV. Elegans has several markings of a yellow colour, each distinctly 
bordered with black. 
Familia — LACERTID^. 
Genus — Ameiva. Cuvier. 
Ameiva longicauda. Mihi. 
Plate XV. — Fig. 1. 
Squamis supra-humeralibus, ihomhoideis, imhricatis ; suhfemoralihus transversim hexa- 
gonis ; abdominalihus in seriebiis decern longitudhialibus dispositis ; caudd, corpore 
cum capite plus quam dupld longiore, squamis medio carinatis, et ad margine sub- 
carinatis. 
Habitat, Bahia Blanca, Northern Patagonia. 
Description. — Head very narrow, much elongated and pointed, the vertex flattened; nostrils rather 
large, open, round, directed laterally, and placed in the centre of the naso-rostral plate ; super- 
ciliary plates three in number, the central one the largest; suprahumeral scales rhomboidal, 
imbricated, not broader than long, in four series ; those of the arm transversely hexagonal ; the 
anterior surface of the thigh, and the inferior of the leg, covered with large hexagonal, some- 
what imbricated, scales; caudal scales above quadrate, longer than broad, with a strong medial 
Carina, and the lateral margins slightly raised ; beneath smooth ; tail very long. Anterior ex- 
tremity placed against the body, reaching rather more than half way to the thigh ; posterior 
extremity extending forwards nearly to the ear. 
Colour. — The upper surface of this beautiful species is dark brown or blackish, with nine distinct 
white or yellowish longitudinal fasciae extending through the whole length of the neck and 
body ; tail with four of these lines. Under parts white. 
DIMENSIONS. 
Inches. Lines. 
Length of the head 0 6" 
of tlie neck 0 3 
of the body 1 4 
of the tail 5 2 
Total length 7 5 
Length of anterior extremity 0 7 
of posterior extremity ..... 1 5 
