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 

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

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

 bordered with black. 



Familia — LACERTID^. 



Genus — Ameiva. Ctcvier. 



Ameiva longicauda. 3Iihi. 



Plate XV.— Fig. 1. 



Squamis supra- humeralibus, rhomhoideis, imhricatis ; suhfemoralihus transversiin hexa- 

 gonis ; ahdomiualihiis in seriehtis decern longitudinalibus disposilis ; caudd, corpore 

 cum capita 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. 



