53 



Olive-brown above ; yellowish below. Length of head and 

 body 295 mm,; tail 95 mm. 



Type-specimen examined in the Paris Museum. 

 Habitat: N. Borneo (Mt. Kina Halu!). 



8. Xenochrophis Giinther. 



(GiiNTiiEK, Kept. Brit. Ind. p. 273, 1864). 



Head slightly distinct from neck; eye small; pupil round; 

 nostril directed upwards and slightly outwards; nasal undivided; 

 a pair of internasals; loreal present. Maxillary teeth 19 or 20, 



o.TOtUes, 



Fig. 30. XoiocJirop/iis vipcriiitis Schenkel X Vio- 



subequal; anterior mandibular teeth largest. Body round or a 

 little compressed, covered with keeled scales, without pits, in 

 19 rows; ventrals rounded. Tail moderate; subcaudals in 

 two rows. 



Distribution. India; Malay Peninsula; Sumatra. 



A single species in the Indo-Australian region. 



I. Xenochrophis viperinus Schenkel. 



Xenochrophis viperinus^ Schenkel, Verb. Ges. Basel XIII 1901, p. 155. 



Head triangular, snout slightly turned up; canthus rostralis 

 distinct, loreal region concave; rostral twice as broad as deep, 

 visible from above; nasal undivided, but traces of a dividing 

 groove present; internasals about as long as broad, their outer 

 border parallel, not convergent ; praefrontals larger than the 

 internasals; frontal longer than its distance from the tip of 



