EULAEMUS DARWIN I. 363 



carinated, and apparently smooth. The symphyseal is subpentagonal, 

 with its base towards the margin* of the jaw. The lower labials are 

 seven in number, larger than the upper labials upon the middle of the 

 series, diminishing in size both anteriorly and posteriorly. We observe 

 six pairs of mental shields, diminishing in size posteriorly. There 

 are two or three series of elongated scales, between the latter and the 

 lower labials. The scales which cover the throat are apparently 

 smaller than on the belly, since they are truncated and rounded pos- 

 teriorly, but are similarly notched or bicuspid. There is a longitudi- 

 nal fold al'ong the middle region of the side of the neck, which is some- 

 times transversely undulated; also a small vertical fold in advance of 

 the shoulder. The entire area, from the auricular aperture to the 

 shoulder, is granular. The aperture just alluded to is well developed, 

 vertically elliptical, and provided in front with granules, instead of 

 scales. 



The dorsal scales are of moderate development, keeled, and poste- 

 riorly rounded : the carination being not very conspicuous ; they are 

 smaller along the middle of the back than on its sides, and smaller 

 still upon the neck than farther behind. The regions of the axillae 

 and groins are almost granular, so much is the size of the scales 

 reduced. The abdominal scales are a little smaller than those on the 

 middle of the flanks ; they are irregular in their outline, though gene- 

 rally rounded upon their posterior margin, which is entire. The pos- 

 terior margin of the scales occupying the middle of the flanks, on the 

 other hand, is notched or else bifid. The scales are smaller on the 

 periphery of the preanal region than upon its middle ; they are most 

 conspicuous on the tail, subverticillated, and more strongly and ob- 

 liquely carinated. The preanal margin is straight; we observe eight 

 or ten preanal pores. 



On the anterior and upper aspects of the forearm, the scales are sub- 

 lanceolated, carinated, and larger than those on the back ; the poste- 

 rior and inferior aspects are granular ; around the arm and on the 

 hand, they are more truncated than the former, appearing conse- 

 quently smaller ; they are keeled above, and smooth beneath, as well 

 as on the hand, whilst they again are keeled on the palm of the hand, 

 where they are quite small. The scales which protect the fingers are 

 keeled also, more conspicuously beneath than above. The upper aspect 

 of the hind limbs is covered with keeled scales, and smooth ones 

 beneath. The posterior aspect of the thigh is granular, except a small 



