116 



One postocalar ; 23 series of scales round 

 the neck. Trunk with 38 broad black cross- 

 bands, confluent on th6 back and belly. b. latifasdata. 



One postocular; 19 to 23 series of scales 

 round the neck. Trunk with from 53 to 59 

 complete blackish rings. „ coronata. 



Two postoeulars ; 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 



*W0- „ graeilis. 



Two postoeulars. Ventral shields 316, all 

 undivided. ^_ ^„„,-«^^^ 



One postocular. Ventral shields 412-440, 

 those on the hinder half of the body split 

 into two. ^^ ,„„i,^i,_ 



B Head of moderate size ; anterior part of the body not, 

 or moderately, elancfate : Thalassophis, (Schmidt), Qthr, 



Head nan-ow, elongate ; body rather slender. 

 Two postoeulars. Ventral shields twice as 

 broad as the adjoining scales, 350 in number. „ lapemoidet^ 



Head narrow, elongate ; body rather slender. 

 Two postoeulars. Ventral shields twice as 

 broad as the adjoining scales, 271 in number. 

 Scales keeled, ,, longuep^. 



