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Show 640 MR. STANLEY S. FLOWER ON THE [May 16, The Indian Changeable Lizard, known as the " Chameleon " by the English in Siam and as the " Bloodsucker " in Ceylon, does not seem to extend to the southern portion of the Malay Peninsula, though it is numerous in Kedah (both at Alor Star and at Kulim) and fairly common in Penang near sea-level, and I have obtained one specimen in the hills there at an elevation of 2200 feet. Dr. Hanitsch records a specimen from the Province Wellesley (Rep. Raffles Libr. & Mus. 1897, p. 9). In Siam this is the commonest Agamoid; there are specimens in the British Museum from Pachebone collected by M . Mouhot, and I have met the species in Bangkok, Ayuthia, Pakpreo, Hinlap (Dong PhyaFai,elevation 700 feet),Tahkamen, Kabin, Chantaboon, and on the island of Kosichang. Description. In Siamese specimens I have counted from 42 to 57 scales round the middle of the body. Colour (in life). Upper surfaces nearly uniform pale brown (either greyish, olive, yellowish, or rufous), with five to seven more or less distinct darker brown transverse bands on the back (these sometimes do not meet symmetrically in the centre line of the back), which are interrupted by a more or less strongly defined light (white, buff, or bright yellow) dorso-lateral longitudinal line (about \\ to 2 scales wide) on each side, which line reaches from the neck to the tail, where it gradually disappears ; these light longitudinal lines may be bordered abo\e and below by very narrow black lines. The upper surfaces of the limbs and digits are cross-barred with brown. The tail is frequently ringed with dark brown, the dark rings being nearly black anteriorly and about twice the width of the pale interspaces. Lower surfaces very pale buff, frequently with faint darkish longitudiual lines on the neck, down the centre of the abdomen, and under the thighs. A noticeable aud apparently constant feature of this species is the dark lines radiating from the eye, and the top of the head is more or less marked. Typical Bangkok specimens have well-defined rich dark brown markings on the head, as follows :- A faint chevron (pointing backwards) on the snout, 3 indistinct cross-bars on the forehead, two fine crescentic lines (pointing backwards) joined by a transverse line behind the eyes, a pair of black spots on the nape (with a very small white spot in the centre and another outside each) ; both upper and lower labials alternately light and dark; 9 lines radiate from the eye, one goes forwards and downwards to the upper labials, another goes backwards and downwards to the upper labials and is continued in the same direction on the lower jaw, another is directed to the tympanum, another is directed backwards and upwards and converges with its fellow on the opposite side, meeting on tbe back of the neck at about the eighth nuchal spine; there is another cross-bar on the neck at about the twelfth nuchal spine. The gular pouch at certain times of year (noted in M a y [Kedah] and in November [Hinlap]) is very conspicuous, eing white, or |