Lacerfa. 147 



fold absent or very indistinct ; collar serrated, sometimes feebly, 

 composed of 6 to 8 plates.* 



Scales round and convex on the nape, elont^ate-hexagonal or 

 rhombic, strongly and diagonally keeled, and juxtaposed or sub- 

 imbricate on the back, narrower on the vertebral line ; smaller on 

 the sides, though sometimes not more than in certain specimens of 

 L. vivipara, and more feebly keeled than on the back ; 35 to 40 f scales 

 across the middle of the body ; 18 ( $ ) to 26 ((^) transverse series, in 

 the middle of the back, corres}>ond to the length of the head, 2 or 3 

 on the sides coi*respond to a ventral plate. Ventral plates in 6 

 longitudinal and 22 to 29 transverse series (22-27 in males, 27-29 

 in females) % ; the plates of the second series from the middle line 

 broadest, those of the first and third equal or the latter the Vjroader. 

 Preaual shield large, bordered by a single semicircle of 8 to 10 small 

 shields. 



Scales on upper surface of tibia keeled, much smaller than dorsals. 

 9 to 13 femoral pores on each side,§ usually 10 to 12. 21 to 25 

 lamellar scales under the fourth toe. Caudal scales forming whorls 

 which are more or less distinctly longer and shorter alternately ; the 

 upper strongly keeled and ending in a point, the lower smooth in the 

 basal part aud rounded behind ; 20 to 24 scales in the fourth or fifth 

 whorl. 



Grrey, pale brown, or pale olive-brown above, with a darker brown 

 or reddish brown verteV)ral baud, 4 to 6 scales wide, and a darker 

 brown lateral baud, often light-edged above and l)eneath, from the 

 nostril, through the eye, to the base of the tail ; back sometimes with 

 small blackish brown spots, which may arrange themselves in a series 

 or run into a streak on each side of the vertebral band ; head brown 

 or reddish brown above, with or without small dark brown dots ; the 

 light streak bordering the lateral band below sometimes very well 

 marked, white, and edged with blackish, especially from below the eye 

 to the shoulder and on the basal part of the tail ; the dark vertebral 

 stripe, broken up into spots on the tail, reappears on the regenerated 

 organ. Throat white; belly gi'eenish in males, |1 yellowish in females, 

 unspotted. The coloration of the young does not differ from that of 

 the adult. 



* Up to 9 according to Mehely. 

 t 32 to 43 according to Lantz and Cyren. 

 X 25-27 in males, 28-31 in females, according to Mehely. 

 § Up to 14 according to Mehely. In a female from the Comana Forest a few- 

 smaller pores from a second series. 



;1 Pea-green in some, according to Mehely. 



