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Show 1900.J AND BATRACHIANS FROM BORNEO. 183 interparietal together, in contact with the two anterior supraoculars ; four supraoculars, first longest; seven supraciliaries ; frontoparietals and interparietal distinct, subequal; parietals forming a suture behind the interparietal; a single pair of nuchals ; fifth upper labial below the centre of the eye. Ear-opening oval, a little smaller than the eye-opening; no auricular lobules. 34 smooth scales round the middle of the body, dorsals slightly larger than laterals and ventrals. A pair of enlarged praeanals. The adpressed limbs slightly overlap. Digits moderately long, compressed; subdigital lamellae smooth, 29 under the fourth toe. Olive-brown above, irregularly spotted with black ; a black lateral stripe, extending from the end of the snout to the groin, passing through the eye and above the tympanum, broken up into spots on the side of the body; lower parts grey. millim. Total length 135 Head 14 Width of head 9 Body 53 Fore limb 20 Hind limb 27 Tail .. 68 Penrissen Mt. Type in the Sarawak Museum. LEPTUROPHIS, g. n. Allied to Lycodon, with which it agrees in the dentition and the absence of hypapophyses on the posterior prsecaudal vertebrae. Maxillary teeth 6 + 6. Head distinct from neck, much depressed ; eye moderate, with vertically elliptic pupil; nostril very large, between two nasals and the first upper labial. Body extremely slender and elongate, cylindrical; scales with strong, finely serrated keels, lanceolate, slightly imbricate, in 17 rows, with apical pits ; ventrals keeled and notched laterally. Tail extremely slender and elongate; subcaudals in two rows. LEPTUROPHIS BORNEENSIS, sp. nov. (Plate XV.) Snout much depressed, broadly truncate. Rostral broader than , just visible from above ; internasals barely half as long as the prefrontals ; frontal as broad as long, as long as the prefrontals, half the length of the parietals ; loreal once and a half as long as deep; one pre- and two postoculars ; temporals 2-f-2 ; eight upper labials, third, fourth, and fifth entering the eye ; five lower labials in contact with the anterior chin-shields, which are as long as the posterior. Scales in 17 rows. Ventrals 241; anal divided; subcaudals 193. Brown above, white beneath. Total length 1480 millim.; tail 570. Sarawak. Type in the Sarawak Museum. One of the slenderest snakes known. 13* |