Description :

From C. A. L. Gunther (1864) The Reptiles of British India:

Head covered with small, irregular, keeled shields above; canthusrostralis sharp; a small tubercle behind the superciliary edge; throat covered with small keeled scales; a series of small shields commences at the chin and runs backwards parallel to the lower labial shields. Tongue scarcely notched in front; two small canine teeth in each jaw; the upper with fifteen very small molars on each side, much smaller than those of the lower jaw, which arc sub-corneal and seventeen in number. A fold across the throat; male with a small gular pouch. Nape of the neck granular, with scattered larger tubercles. Both sexes with a nuchal crest, composed of triangular lobes; it is continued along the back as a slight serrated ridge, and gradually disappears on the anterior part of the tail. Trunk slightly compressed; the upper parts arc covered with smallish, keeled scales, intermixed with larger ones, all having their points obliquely directed upwards. Ventral scales strongly keeled, of moderate size; there arc about thirty-eight scales in a longitudinal series between fore and hind limb. All the scales of the tail are rhomboid and keeled, those on its lower side being the largest.