SYSTEMATIC ACCOUNT OF THE SPECIES. 167 
with the exception of the small supraocular scales, uniformly enlarged; a well- 
developed series of strongly keeled suboculars continued backward as a supra- 
tympanic series; six supralabials to the middle of the eye; a series of three or 
four rows of small scales separating the supralabials from the suboculars; above 
the angle of the snout and in front of the lower edge of the eye a large tubercu- 
lar shield; above it about the middle of the front edge of the ear two large 
shields, preceeded by a third, all three tubercular; below the angle of the mouth 
a few tubercular scales, irregularly arranged; five infralabials to the middle of 
the eye; a single row of very large, keeled malar scales, and two anterior ones 
in contact with the infralabials, the rest separated from the infralabials by one 
or two rows of small scales; dorsal and ventral scales small, about eleven con- 
tained in the vertical diameter of the tympanum; from the nuchal fold along 
the median line of the neck and back a row of low, blunt spines, the largest 
slightly over a centimeter high; this crest interrupted on the shoulders and rump, 
thirty-seven spines between these two points; upper surface of the limbs with 
slightly imbricated, keeled, posteriorly pointed scales considerably larger than 
the body-scales; scales covering the upper surface of the radius and tibia 
much larger than those covering the humerus and femur; on the upper arm 
about eight, on the lower about five of these scales to the vertical diameter of 
the tympanum; a single series of twenty-two femoral pores; inner side of 
second toe with one comb, of third toe with two combs, each consisting of three 
lobes; tail compressed, covered with obliquely keeled scales in vertical rows, 
forming faintly indicated verticils; tail surmounted by a serrated crest similar 
to the body-crest but formed of slightly larger spines. 
Colour (in life): —Ground tone of dorsal surface brownish gray; whole 
dorsal surface sprinkled with pale, yellowish green, the spots very abundant 
and partly confluent posteriorly; flanks marked by four broad, vertical stripes 
of pale bluish gray; each stripe edged dark slaty gray, sides and upper surface 
of the head broadly blotched with pale bluish yellow; sides of the tail with a 
series of irregular vertical stripes of bluish gray becoming regular and evenly 
spaced posteriorly, ventral surface somewhat. lighter than the upper surface. 
Dimensions: — Total length 910 mm. 
Tip of snout to vent 347 mm. 
Vent to tip of tail 563 mm. 
Tip of snout to ear 73 mm. 
Width of head 52 mm. 
Fore leg 156 mm. 
Hind leg 254 mm. 
