BUCEPHALUS VIRIDIS. — Smith. 
Reptilia. — Plate III. — (Male.) 
B. pallide viridis; oculis brunnois ; scutis abdominalibus 181 ; scutis subcaudalibus serie duplici collocatis 
circiter 101. 
Colour. — Light grass-green, the abdominal plates with a slightly livid 
tint; eyes dark brown. 
Form, &c. — Head moderately elongated, distinctly quadrangular and 
broader than the neck ; nose slightly rounded ; nostrils small, nearly circu- 
lar, and directed outwards and backwards ; eyes large, and situated rather 
nearer to the tip of the nose than the angle of the mouth : gape wide ; upper 
lip with seven plates on each side, lower with ten. Nasal plate triangular, 
apex directed backwards; anterior frontal plates two, somewhat triangular; 
posterior frontal plates large quadrangular, the outer posterior angle rounded ; 
vertical plate triangular, the apex behind, rounded ; occipital plates large, 
irregular and narrow behind ; palpebral plates somewhat six-sided, the 
two middle sides longest. Gular plates large, two in each row. The posterior 
or mobile and grooved teeth of maxilla, eight on each side, from two to three 
lines in length, and slightly curved ; four of each group placed for immediate 
use, the rest recumbent between those and the inner portion of the spongy 
sheath which envelopes the whole ; the fixed or anterior teeth of maxilla 
small and slightly curved, their points directed backwards ; those of the pa- 
latal arches and lower jaw somewhat similar. Body gradually increasing in 
size till near the middle, from thence it tapers to the point of the tail, which is 
armed with a horny aculeus ; the figure of body and tail subcylindrical, 
slightly flattened below. Skin as far as the tail loose, and only slightly 
connected with the subjacent parts by a delicate cellular membrane ; towards 
the head superabundant, and forming on each side of the neck a longitudi- 
nal fold, which disappears when the gullet is distended. On the tail the 
skin is firmly connected to the parts beneath. Scales immediately behind 
occipital plates short, broad, and imbricate ; from those to the base of the 
tail they are disposed in slightly waved transverse bands, each of which 
bands includes scales of several different forms ; the one immediately on the 
centre of the back is narrow towards the base, broad and semilunar at the 
