119 



E. SCHISTOSA(?) 

 Wider gape, longer head, shields less granular. Scales 58-60. 



PELAMIS, Baudin (sp.) 

 Head flat, with long spatulate snout, a pair of frontals, 

 nasals contiguous ; no ventrals. 



P. BicOLOE, Schneider. 



Black above, light brown below, with a yellow lateral 

 band. Each scale sometimes impressed in the middle. 



Thied Sub-oedee.— VIPERINE SNAKES. 

 Family XX.— CROTALID^. 

 Body stout, tail moderate or short. Head broad, sub- 

 triangular, generally scaly or imperfectly shielded. A deep 

 pit on the side of the snout corresponding to the cavity of 

 the maxilla. Eye moderate, with erect pupil. Poison-fang 

 long, no simple teeth behind it. 



TRIMESURUS, Gray. (Teimeeesueus, Gunther.) 

 Head shielded only in the supraciliary and rostral regions. 

 Body and head covered with more or less keeled scales ; 17-27 

 rows. Anal entire, subcaudals double. 

 T. GEAMiNEUS, Shaw. Plate XX, fig. 3. 



In this and the following five species the second labial 

 forms the front of the facial pit. The small supranasals are 

 separated by a small azygos shield. Scales 19-21. Ven- 

 trals 158-170, subc. 58-71. Grass green, belly paler, yellow 

 lateral stripe. 



Burma, Straits, China, Assam. 



T. EEYTHEURUS, Cantor. 



Scales 21. Ventrals 150-164, subc. 54-70. Supranasals 

 contiguous. Same colour as the preceding, tail red or ruddy, 

 lips often white. 



Bengal, Burma, China. 



