16. CAL0XE8, 327 



orbital region ; two distant spines on each side of the back of the 

 head, between the ear and the nuchal crest ; diameter of the tym- 

 panum nearly half that of the orbit. Gular sac not developed ( $ ) ; 

 gular scales strongly keeled, as large as ventrals. A short oblique fold 

 in front of the shoulder. Nuchal crest formed of narrow separated 

 spines, the longest of which measure about the diameter of the tym- 

 panum; dorsal crest quite indistinct. Thirty-five or thirty-nine scales 

 round the middle of the body ; dorsal scales three times as large as 

 ventrals, squarish, smooth, pointing backwards and downwards ; ven- 

 tral scales strongly keeled. The adpressed hind limb reaches hardly 

 the tympanum ; third and fourth fingers equal. Tail round. Pale 

 olive, with indistinct brown transverse bauds on the back ; brown 

 lines radiating from the eye, the lower reaching down to the lower 

 lip. 



Total length 256 millim. 



Head 21 „ 



Width of head 13 „ 



Body 55 „ 



Fore limb .... 36 „ 



Hind limb 51 „ 



Tail 180 „ 



Ceylon. 



a. 2- Ceylon. B. II. Barnes, Esq. [P.]. 



b. Yg. Ceylon. 



15. Calotes ophiomachus. 



Calotes ophiomachus, Gray, Cat. p. 243. 

 Lacerta calotes, Linn. S. N. i. p. 367. 

 Iguana calotes, Laur. Syn. Rept. p. 49. 

 Agama calotes, Daud. Rept. iii. p. 301, pi. xlii. 



ophiomachus, Merr. Tent. p. 51. 



lineata, Kuhl., Beitr. Zool. Vergl. Anat. p. 108. 



Calotes ophiomachus, Kaup, Isis, 1827, p. 621 ; Dtim. ^- Bibr. iv. p. 403 ; 



KelaaH, Prodr. Faun. Zeyl. p. 169 ; Giinth. Rept. Brit. Ind, 



p. 142. 



Upper head-scales smooth, imbricate, enlarged on supraorbital 

 region ; two groups of spines on each side of the head, between the 

 ear and the nuchal crest ; tympanum nearly half the diameter of 

 the orbit. Gular sac not developed ; gular scales feebly keeled, 

 nearly as large as ventrals. A short oblique fold in front of the 

 shoulder. Dorso-nuchal crest composed of closely set lanceolate 

 spines directed backwards, with smaller ones at the base ; in the 

 male the height of the crest on the nape equals or exceeds the dia- 

 meter of the orbit, and decreases gradually on the back. Thirty- 

 one to thirty-five scales round the middle of the body ; dorsal scales 

 very feebly keeled, or even quite smooth, with the points directed 

 upwards and backwards ; ventral scales larger than dorsals, very 

 strongly keeled and mucronate. The adpressed hind limb reaches 

 the anterior border of the orbit or a little beyond ; third and fourth 



