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back only. A fold before the shoulder. Scales of the sides very- 

 large, smooth, of the belly much smaller, keeled. 



Colour green. Length, body 10-00 ; tail 8-00 = 18-00 inches. 



Inhabits Kunur Ghat, Nilghiri Hills. Ceylon (Giinther). 



C. mystaceus D. et B. 



Two groups of small spines above each tympanum. A series of 

 slightly larger scales from the eye to above the tympanum. Dorsal 

 crest well developed. A fold in front of the shoulder. Scales on the 

 sides nearly twice as large as those on the belly. Colour, during 

 life, dark brown ; often ruddy vinous, with a conspicuous white 

 band from the nostrils to behind the shoulder, and sometimes to 

 the base of the tail. Sometimes only a few dead white spots on 

 the body, or white or yellow blotches on the shoulders. Season- 

 ally the males (and some females) assume a gorgeous livery 

 the gular sack and the entire fore-part of the body becoming a 

 bright deep blue, red mottled on the throat (fading in spirits to 

 green but green is not the hue of the living animal.) The larg- 

 est female I have seen measured, body 4'50 ; tail 8-50 = 13 inches. 

 Stoliczka. records one 16 inches. A male measured, body 4-25- 

 tail 6-00 = 10'25. Gunther says it grows to 24 inches, which 

 is I believe an error. 



Inhabits Arrakan, Pegu, Tenasserim, Siam, Ceylon. The 

 Nikobars (Blyth) the Garo Hills, &c. 



C. Eouxii D. et B. 



Two small groups of spines on each side of the neck. 

 A fold in front of the shoulder. Tail compresseii into a 

 sharpish edge at its base, covered superiorly with very large 

 pentagonal scales. Tail below with four longitudinal series of 

 strongly keeled scales, each with a posterior point. Colour 

 brown, uniform, or spotted with black. 

 Inhabits Indift.. 



C. ophiomachus Merr. 

 A single series of spines descends obliquely backwards above 

 the tympanum. Scales between the eye and tympanum small, 



