REPTILES. 



21 



each side bluish gray, passing beneath into yellowish white. A series of very irregular transverse 

 spots cross the yellow median portion of the back, and there are others on the sides ; and these 

 two series becoming confluent on the tail, form, with the yellow ground, alternate half rings of 

 the two colours. The upper part of the legs has similar bands. The whole of the throat, belly, 

 and inferior surface of the limbs and tail are yellowish white. There are numerous small 

 blackish spots over these parts which are more distinct and linear on the throat, and becoming 

 paler, smaller and round on the belly. 



DIMENSIONS. 



Inches. Lines. 



Length of the head 1 



ofthebody 2 2 



ofthetail 3 8 



Totallength 7 



Length of anterior extremity 1 1 



of posterior extremity 1 6 



Taken at Port Desire, on the coast of Patagonia. 



Diplol^:mus Bibronii. 3Iihi. 



Plate XL 



Squamis capitis planis ; caudd corpore cum capite breviore. 



Habitat, Port Desire. 



Description. — Head thick and clumsy, longer than it is broad, muzzle obtuse, supra-orbital arches 

 slightly elevated. Nostrils as in the former species, in size, form, and situation. Ears sub- 

 triangular, the margin simple. Neck considerably contracted, with a longitudinal fold on 

 each side, and a distinct transverse fold on the throat. Body rather broad, slightly depressed, 

 perfectly even, without any central crest or elevation. The tail is shorter than the head and 

 body, slightly triangular at its base, tapering regularly to its extremity. Limbs of moderate 

 length; the toes of each foot longer than in D. Bibronii, and those of the fore -feet more 

 unequal, the third being the longest, then the fourth, the second, the fifth, and the first. The 

 fore-legs placed against the side reaches to about two-thirds of the distance between the 

 shoulder and thigh ; the hinder foot placed in the same manner reaches to the axilla. 



The scales of the head are quite flat, a character in which this species differs remarkably 

 from the former, although in their number and arrangement they are very similar. The occi- 

 pital scale is flat and hexagonal. Between the labial scales and the suborbital, there are, in 

 addition to the regular series of larger supralabial scales, at least three distinct series of smaller 

 ones ; whereas in D. Darwinii there is but one. 



The scales of the temples, the neck, the body, the limbs and the tail, are similar to those 



