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Show 674 MR. STANLEY S. FLOWER ON THE [May 16, Labials and sides of neck yellow; a dark mark below eye and another behind it running obliquely to angle of mouth, and another similar but larger mark on the neck. Size. These specimens were 193 mm., 212 mm., and 222 mm.in length. Hab. Malay Peninsula. 152. PSEUDORHABDIUM LONGICEPS (Cantor). Pseudorhabdium longiceps, Blgr. Cat. Snakes, ii. p. 329. Recorded from Penang, Perak, and Singapore (P. Z. S. 1896, p. 886). Hab. Malay Peninsula, Sumatra, Borneo, Celebes, Philippines. 153. CALAMARIA ALBIVENTER (Gray). Calamaria linncei, var., Cantor, p. 62. Calamaria albiventer, Blgr. Cat. Snakes, ii. p. 336. Of this very handsome snake I got a specimen, 279 mm. long, on Penang Hill, elevation 2000 feet, in March 1898. Its colours were very distinct and pretty. Colour (in life). Above rich red-brown, with a pair of black-edged bright red vertebral lines; on each side a black-edged bluish-white line. Upper surface of head rich red-brown, finely speckled with black, tinder surface of head rich lemon-yellow, which gradually shades into red on the neck ; remainder of lower surface bright coral-red. A median black line under the tail. Hab. Malay Peninsula. 154. CALAMARIA SUMATRANA Edeling. Calamaria sumatrana, Blgr. Cat. Snakes, ii. p. 339. Hab. Malay Peninsula (Singapore, W . L. Sclater, J. A. S. B. Ix. 1891, p. 233) and Sumatra. 155. CALAMARIA LEUCOCEPHALA D. & B. Calamaria lumbricoides, var. Cantor, p. 61. Calamaria leucocephala, Blgr. Cat. Snakes, ii. p. 344. Localities, Of this species, already recorded from Penang and Singapore, I obtained four specimens on Penang Hill, at elevations of about 2200 feet, and one at the mouth of the Batu Caves, near Kuala Lumpor, Selangor. Habits. Two were found under a water-butt near a house ; when disturbed they were fierce, striking and threatening with wide-opened mouth. Colour (in life). These snakes are highly iridescent, and the line of demarcation between the dark upper and light lower parts is sharply defined: upper parts rich dark brown, purplish blue, or blackish ; lower parts uniform white, buff, or very pale purplish blue, with a more or less indistinct zigzag median dark line under the tail. Head and neck bright lemon- or sulphur-yellow ; on the top of the head there may be a symmetrical chestnut-coloured |