146 MkovwaTXDM. 



213 yentrals ; diameter bi body 38 times 



in total length ; rostral half length 



of shielded part of head 12. macrorhynchus, 



180-188 ventrals ; diameter of body 83 [p. 153. 



to 40 times in total length 13. beddomii, p. 153. 



2. Eye half the length of the ocular, or more ; snout obtuse. 

 a. Portion of rostral seen from above longer than its distance 

 from the frontal. 

 144-157 ventrals ; diameter of body 28 

 to 38 times in total length ; rostral 

 one third length of shielded part of 



head 15. pMpsonii, p. 155. 



139-153 ventrals ; diameter of body 25 

 to 32 times in total length ; rostral 

 not quite one third length of shielded 

 part of head 17. myJiendrce, p. 156. 



5. Portion of rostral visible from above as long as its dis- 

 tance from the frontal. 

 142-150 ventrals ; diameter of body 30 



to 32 times in total length 18. madureiuis, p. 156. 



127-136 ventrals ; diameter of body 25 [p. 157. 



to 33 times in total length 19. rubromaculata, 



e. Portion of rostral visible from above shorter than its 

 distance from the frontal. 

 128-130 ventrals ; diameter of body 26 

 or 27 times in total length ; eye half 



length of ocular 20. arcticeps, p. 157. 



120-146 ventrals ; diameter of body 21 

 to 29 times in total length ; eye more 

 than half length of ocular 21. brevis, p. 158. 



III. 15 scales round the middle of the body ; 128-140 ventrals ; 

 diameter of body 24 to 29 times in the total length. 



22. macrolepis, p.' 159. 



1. Silybura melanogaster. 

 Mytilia (Orealia) melanogaster, Gray, Proo. Zool. Sqc. 1858, p. 264, 



%■ 

 Plectrurus ceylonieus, Peters, Mon. Perl. Ac, 1859, p. 388. 

 Rhinophis melanogaster, Peters, Tlropelt. p. 18, pi. ii. fig. 4 (1864) ; 



Jan, Icon. G&n. p. 47, 1. 9, pi. ii. fig. 4 (1865). 

 • blvthii, part., Qunth. Itept. Brit. Ind. p. 186 (1864) ; Theoh. 



Cat. 'Pept. Brit. Ind. p. 130; 1876). 

 Silybura melanogaster, Beddome, Ann. 8f Mag. N. H. (6) xvii. 1886, 



p. 20 ; Bouleng. Faun. Ind., Pept. p. 260 (1890). 



Snout pointed ; rostral about one third the length of the shielded 

 part of the head, the portion visible from above longer than its 

 distance from the frontal, entirely separating the nasals ; frontal 



