CROCODILIANS, LIZARDS, AND SNAKES. 359 



S. torquatiis, excei)t that there are two single verticals. Free portion 

 of longest toe nearly equal to the cephalic i)lates, reaching from muzzle 

 to middle of occipital. Scales on back strongly carinated and acutely 

 pointed, with a conspicuous, but not entirely free, spine. Two or three 

 distinct lateral denticulations. Belly scales notched. No conspicuous 

 difference in size between scales of back, rump, and tail above ; the first, 

 however, larger than those on sides. Scales smooth on the inside of 

 tibia. About thirty-two oblique rows of scales from head to tail, 

 twenty-two from cervical fold. Femoral pores, fourteen or fifteen. 



Color, yellowish green, with a distinct, cervical, black collar, broadly 

 interrupted above and continued below across the throat; not mar- 

 gined. Back with dull, obscure, transverse bars and a series of dusky 

 spots beneath a rather lighter lateral line. 



In this species the head is scarcely wider than the neck. The wide 

 space between the true marginal series of plates is occupied by one 

 series of five, broad, short plates. Of these, the two posterior are in 

 immediate contact with the occipitals; the others cut off from the 

 median ones. The other plates which occupy the remaining j)ortion of 

 the head are arranged as follows : Beginning with the posterior, or occi- 

 pitals, 3, 2, 1, 1, 2, 3, and perhaps 2, 2 smaller ones, to the nostrils, 

 although this space is sometimes much broken up. The occipitals are 

 large; the two of the second row are separated by the contact of the 

 middle one of first row and the third; the two of the fifth row likewise 

 separated by the contact of fourth and middle fifth. The infraorbital 

 chain is composed chiefly of one large horizontal plate. The temporal 

 scales are large, about six series intervening between the orbital chain 

 and the ear. 



All the upper and lateral scales, as well as those on the under sur- 

 face of the feet, are strongly carinated; the carina extended into a con- 

 spicuous spinous point. Those on both upper and under surface 

 herein, besides ending in a point, have the posterior edge denticulated 

 on each side of this, seen even on the chin. 



The general color of this species in the alcoholic specimen is a yellow- 

 ish olive above, with a series of transverse but obsolete dusky bars, of 

 which there are perhaps ten from the cervical collar to above the anus 

 and continued to the tip of tail. These appear to be separated by 

 rather lighter intervalsand themselves to be almost broken up into about 

 four blotches. There is a slight indication of a V-shaped blackish-green 

 collar on the side of the neck, just against the shoulder; but this is 

 interrupted on the back, the branches running out to a point. Below, 

 it is continued across the throat as a dusky green baud, and the sides 

 of the chin being of the same color, they bound a triangular blue spot 

 beneath the head. There is also a blue patch on each side the belly, 

 extending from fore to hind legs and scarcely separated on the median 

 line. It appears to be rather darker internally and behind. 



A specimen (Oat. Xo. 21)(;4) in better condition than the type (Cat. No. 



