1900.J ais"d~batrachians from Borneo. 183 



interparietal together, in contact with the two anterior supra- 

 oculars ; 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 tbe 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 preanals. 

 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 precaudal 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 pre- 

 frontals, half the length of the parietals ; loreal once and a half 

 as long as deep ; one pre- and two postoculars ; temporals 2 + 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* 



