150 
BarYCEPHALUS SYKEsiI, Gthr. (Pl. XXV. fig. A.) 
Diagnosis.—Temple, sides of the throat and trunk, and the poste- 
rior part of the hind legs with scattered spines; a transverse series 
in the middle of the belly contains about fifty shields. Upper parts 
dusky, variegated and speckled with black, the lower parts whitish ; 
throat reticulated with greenish. 
The following specimens are in the Collection :— 
Adult. Simla, Himalaya; 2500 feet above level of the sea. 
Half-grown. Simla, Himalaya; 7200 feet above level of sea. 
Adult. Giarhval, Himalaya ; 8200 feet above level of the sea. 
. Young. Balti, Tibet; 6100 feet above level of the sea. 
. Half-grown. Ladak, Tibet ; 15,250 feet above level of the sea. 
SAS S8 
Description.—The head is rather depressed and flat, with the 
canthus rostralis distinct, and with the snout of moderate length ; it 
is covered above with numerous very small shields ; there is a shield 
in the middle of the occipital region, which is rather larger than the 
others, but it is not present in all the specimens; a series of slightly 
keeled shields runs along the median line of the snout. The width 
of the space between the bony orbits is one-half that of the upper 
eyelid. The rostral shield is low, twice as broad as high ; there are 
twelve upper labials. The nostril is in a single shield, which is 
situated between the canthus rostralis and the first upper labial. The 
loreal region is concave, and covered with minute shields. The 
median shield of the lower jaw is subpentagonal, and longer than 
broad ; the lower labials are eleven in number, and higher than 
those of the upper lip ; several other series of very small shields run 
parallel to that of the labials, the remainder of the throat being 
covered with minute granules. A low spiny crest proceeds from 
below the eye to the tympanum, the anterior circumference of which 
also is provided with spinous scales; several other groups of spines 
are between the tympanum and the fold of the throat, and on the 
sides of the neck, which is exceedingly finely granulated. 
The trunk is depressed and flattened; the back is covered with 
small imbricate scales, each being provided with a strong keel ; they 
gradually pass into the granulations of the sides, which, however, 
are intermixed with small scattered spines. The belly is covered 
with smooth square shields, arranged in transverse series ; they are 
so small that I count fifty of them in one of the series in the middle 
of the belly. 
The ¢ai/ is considerably depressed at the base, assumes gradually 
a more conical form, and tapers posteriorly into a fine point; it is 
verticillated. The scales form rings, are quadrangular and strongly 
keeled, each keel terminating posteriorly in a small spine. The 
scales which are the largest and provided with the strongest keels 
are those on the anterior and superior parts of the extremities; the 
scales round the jomts and on the posterior and inferior sides are 
smaller, and smooth. The fore leg reaches to the loin, if laid back- 
wards ; the third and fourth fingers are the longest, and equal in 
