116 



One postocular; 23 series of scales round 

 the neck. Trunk with 38 broad black cross- 

 bands, confluent on the back and belly. jet. latifasciata. 



One postocular ; 19 to 23 series of scales 

 round the neck. Trunk with from 53 to 59 

 complete blackish rings. „ coronata. 



Two postoculars ; 33 series of scales round 

 the neck. Trunk with 62 blackish rings. ,^ diadema, 



2. Scales not imbricate^ placed side by side. 



A Head very small ; neck exceedingly slender : 

 Microcephalophis, (Less.), Gray. 



One postocular. Ventral shields 228-249, 

 those on the hinder half of the body split into 



two. „ gracilis. 



Two postoculars. Ventral shields 316^ all 

 undivided. „ fasciata. 



One postocular. Ventral shields 412-440, 

 those on the hinder half of the body split 



into two. „ cantoris. 



B Head of "moderate size ; anterior paH of the body not^ 

 or moderatdy, elongate : Thalassophis, (Schmidt), Gthr. 



Head narrow, elongate ; body rather slender. 

 Two postoculars. Ventral shields twice as 

 broad as the adjoining scales, 350 in number. ,, lapemaides. 



Head narrow, elongate ; body rather slender. 

 Two postoculars. Ventral shields twice as 

 broad as the adjoining scales, 271 in number. 

 Scales keeled, „ longicejof. 



