JOURNAL, R.A.S. (CEYLON). [VOL. XI. 



== 33 Hblicops schistosus. 

 As in a, but only a small single internasal. 



1. — Frontal of the usual form. 33 H. schistosus. 



2. — Frontal elongate, with concave sides. 41 G. prevostiana. 



= 10 ASPIDURA BRACHYHORROS. 



A single internasal ; anterior frontals in contact with 

 the labials ; nasals placed on front margin of snout. 

 1. — Two nasals, no loreal ; prse-frontals separated from 



the eye by a prse-ocular. 10 A. brachyhorros ; 14 H. 



ceylonensis. 



i. — As in d 1 ; no prse-ocular ; prae-frontal enters the eye. 

 11 A. copii. 



3. — As in d 1 ; prse-ocular very small ; prefrontal enters 



the eye. 12 A. guentheri ; 13 A. trachyprocta. 



= 37 Dryophis mycterizans. 



As in a ; rostral produced into a flexible nasal appen- 

 dage ; anterior frontals in contact with the labials. 37 

 D. mycterizans ; 38 D. pulverulentus. 



= 47 Hydrus platurus. 



A pair of very large contiguous nasals CDver the snout ; 

 no internasals. 



1. — Chin shields absent, or merely larger scales ; temporals 



small, numerous. 47 H. platurus. 



2. — Chin shields indistinct or very small ; two or three 



superimposed temporals ; parietals broken up into 

 small shields generally, although sometimes only 

 divided in two (in one specimen parietal on one 

 side is only notched), 46 E. curtus. 



3. — A single anterior temporal ; frontal as long as its dis- 



tance from rostral ; two pairs of subequal chin 

 shields in contact. 48 H. spiralis ; 49 H. fasciatus. 



4. — As in f l ; frontal very small, hardly as long as 



distance from rostral. 50 H. gracilis ; 51 EL 

 cantoris. 



