( xxxiv ) 



Tetragonosoma. 



Loreal none. Two nasals. 



Loreal none. Purple, marbled with black 

 and white . . . T. atropurpureum. 



b. — Scales keeled or grooved. 



Ophites. 



Scales in 17 rows. 

 Pale reddish with 50 brown cross bands . . . O. albofuscus. 

 Two yellow dots on each scale ... 0, jara. 



Cercaspis. 



Scales in 17 to 19 rows. Subcaudals entire. 

 Colour black, encircled with white rings . . . C. carinata. 

 Colour black with white bars ... C. Travankorica. 



Family AMBLYCEPHALID^. 



Body slender, compressed. Head short, distinct. Nasal one. 

 Mandible not expansile. 



Pareas. 

 Caudals bifid. 

 Loreal none. A small lower prseocular ... P. monticola. 

 Loreal none. One large prseocular ... P. Isevis. 



Loreal small ... P. margaritophorus. 



Loreal moderate. Two small prseoculars ... P. modestus. 



Family XENOPELTID^. 

 Occiput covered by five shields. Eye small. 



Xenopeltis. 



Scales lustrous, smooth in 15 rows. 

 5 occipitals. Loreal none ... X. unicolor. 



Family PYTHONID^. 



Large snakes with a spur-like prominence in adults, indicating 

 an aborted pelvic limb, on each side of the vent. 



