204 



JOURNAL, R.A.S. (CEYLON). 



[Vol. XI. 



4. — As in h z . Scales of neck smooth, those on the body 



with a tubercle or short keel. 49 H. fasciatus. 



5. — Scales imbricate anteriorly, elsewhere hexagonal, tessel- 



lated, each with two or more tubercles ; feeble in the 

 female ; ventrals hardly enlarged. 50 H. gracilis : 

 51 H. cantoris. 



6. — All the scales imbricate, keeled, ortubercled ; ventrals 



enlarged anteriorly, further back in pairs. 52 D, 

 stokesii. 



7. — Scales slightly imbricate, strongly keeled ; ventrals 



feebly enlarged ; bituberculate. 53 D. jerdonii. 



8. — Much as in h 7 , but the scales may be smooth or have 



a tubercle or short keel. 54 D. robusta. 



9. —Much as in h 7 ; the keel may be broken up into tuber- 



cles, and the ventrals maybe smooth. 55 D. cyano- 

 cincta. 



10. — Much as in h 5 ; scales in the young smooth, in the 



adult with a tubercle or keel. 56 D. ornata. 



= 34 Chersydrus granulatus. 



Scales very small ; rough, round warts, each with a 

 small tubercle Those occupying the medium ventral 

 fold have a very short keel ending in a minute point. 34. 



MEAD SHIMMY, 



= 24 Zamenis mucosus. 

 Head entirely shielded above ; rostral not produced or 

 enlarged ; a pair of internasals and prse-frontals ; the 

 internasals never much reduced in size ; anterior 

 frontals neither in contact with the labials nor forming 

 part of the labial margin, which is formed by many 

 shields ; nasals small, lateral ; a mental groove ; chin 

 shields symmetrically arranged. 



1. — Two nasals ; two or three loreals (three generally) ; 

 all the upper labials reach labial margin ; supra- 

 ocular projecting. 24 Z. mucosns. 



