28 ZOOLOGY OF THE YOYAGE 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 

 fiat ; in the other they are convex. The colour of this species is uniformly green, 

 whereas 2V. Elegans has several markings of a yellow colour, each distinctly 

 bordered with black. 



Familia — LACERTID^. 



Genus — Ameiva. Cuvier. 



Ameiva longicauda. Mild. 



Plate XY.— Fig. 1. 



Squamis supra- humeralibus, rhomboideis, imbricatis ; subfemoralibus transversim hexa- 

 gonis ; abdominalibus in seriebus decern longitudinalibus dispositis ; caudd, corpore 

 cum capite plus quam duplo 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 6' 



of the neck , 3 



of the body 1 4 



of the tail 5 2 



Total length 7 



Length of anterior extremity t 



of posterior extremity 1 



