NAIA AN GUSTICEPS.— Smith. 
Reptilia. — Plate LXX. 
N . superne subviridis, infra subochrea; capite angusto, elongate, quadrangulare ; corporis squamis, 
ordinibus longitudinalibus 1 9 dispositis ; cauda longa. 
Longitudo e nasi apice ad anum 56 unc. ; caudee 9 unc. 
Colour. — Above, pale olive or dull grass-green, in some specimens faintly 
tinted with brown ; the upper lip and the under parts of the head, body, and 
tail, pale asparagus-green. Very large individuals of this species are occa- 
sionally found, in which the colour of the upper parts is intermediate between 
deep orange-coloured brown and yellowish brown (fig. d.), that of the under 
parts intermediate between straw and ochre yellow. In these the abdomina 
plates towards the head and the tail, are generally profusely blotched with 
clove-brown.* . , . , 
Form, &c. — Head long, rather narrow, and quadrangular; hind-head 
scarcely wider than the neck; the body increases in size to nearly 
its middle, thence continues of the same thickness for some distance, an 
then decreases to the tail; the latter is long, subtriangular, and pointed, its 
apex a horny scale. The upper surface of the head is flat, and the sides 
perpendicular ; the temples slightly prominent and convex ; nose rather 
broad and slightly arched ; nostrils subovate, opening backwards and out- 
wards. Eyes moderately large, cornea very convex, pupil small and cir- 
cular. Rostral plate subtriangular, its apex arched ; naso-rostral plates 
quadrangular; fronto-nasal, large and subquadrangular, each notched at its 
posterior and outer extremity, to receive the anterior and upper portion of 
the preocular plate ; palpebral plates irregularly six-sided, broadest behind ; 
frontal plate large, subquadrangular, its apex rather blunt, its base very 
~T^~~^^species of the genus, the colours, at least in some individuals, appear to change 
with age. 
