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Show 1899.] REPTILES OF T H E M A L A Y PENINSULA AND SIAM. 641 white speckled with red ; so far as I have observed, it is only in the males that the pouch becomes distended. In January [Chantaboon] the males had the head, neck, upper arms, and fore part of the body diffused with bright red, which gave them a striking appearance. In spirits the gular pouch becomes hardly noticeable. Iris reddish brown. Inside of mouth flesh-colour. Size. The largest individuals of their respective sexes, out of a large series that I have measured, are :- ** cS from Alor Star, Kedah. Total length 376 mm. (snt. to vnt. 95 ; tail 281). $ from Sepov Lines, Penang. Total length 332 mm. (snt. to vnt. 86 ; tail 246). The nuchal spines attain a length of 5*2 mm. Hab. Afghanistan, Beloochistan, India, Ceylon, Burma, Siam, South China, Malay Peninsula. 65. CALOTES EMMA Gray. Calotes emma, Blgr. Cat. Liz. i. p. 324, pl. xxv. fig. 1. I have obtained one specimen from Chantaboon. Also a lizard, said to have been caught in Bangkok, cS, total length 296 mm. (snt. to vnt. 84; tail 212), with about 72 scales round the middle of the body, which I sent to the British Museum, " appears to be an abnormal C. emma," on the authority of Mr. Boulenger. Hab. Burma, Siam. 66. CALOTES MYSTACEUS D. & B. Calotes mystaceus, Blgr. Cat. Liz. i. p. 325. M. Mouhot obtained a specimen in Cambodia, and I received two from Chantaboon. Hab. Ceylon, Burma, Nicobars, Siam, Cambodia. 67. PHYSIGNATHUS MENTAGER Giinth. Physignathus mentager, Giinth. Rept. Brit. Ind. p. 153, pl. xv.; Blgr. Cat. Liz. i. p. 400. Siamese. " King-kar-kong." This fine lizard was described from a specimen obtained at Chantaboon by M. Mouhot, who also got the species at Pachebone. I received one from Chantaboon, and though the tip of the tail was broken off it measured in total length 620 mm. (snt. to vnt. 250 ; tail 370); it had eleven enlarged shields on either side of the throat. In the Siamese Museum is a rather smaller specimen with ten enlarged shields on either side of the throat. Hab. Siam. N.B.-PHYSIGNATHUS COCHINCHINENSIS (Gue'rin). Physignathus cochinchinensis, Blgr. Cat. Liz. i. p. 399. This lizard is known from Cochinchina, so may possibly also occur in Siam, A lizard in the Siamese Museum, labelled by |