27 



latter are distinguishable by the pit they have 

 between the eye and the nostril, and are commonly 

 known as " Pit Vipers/' All vipers are very 

 poisonous, and have enlarged fangs, capable of 

 being erected or depressed, and a well-developed 

 poison apparatus. 



Table of the Terrestrial Genera of Ceylon. 



1 



Typhlopidse 



2 3 4 5 6 



Boidae Ilysiidae Uropeltidae Colubridae Viperidae 



1 Typhlops 2 (a) Python 3 Cylindrophis 4 Uropeltis 



5 Silybura 



6 Rhinophis 



(Aglypha) 



(Opisthoglypha) 



[Vip erinae] | [Crota linae] 



I I 



7 Vipera 9 Ancistrodon 



8 Echis 10 (a) Trimeresurus 



(Proterog lypha) 



[Colutrinae] 



[Dipsadinae] [Homalopsinas] [Elapinse] 



24 {a) Dipsas 27 (aq) Cerberus 29 Callophis 



25 (a) Dryophis 28 (aq) Hypsirhina 30 Bungarus 



26 {a) Chrysopelea 31 Naia 



(a) Arboreal 



{sq) Semi-aquatic 



{aq) Aquatic 



[ ] means Sub-Family 



1 1 Aspidura 



12 Haplocercus 



13 Lycodon 



14 Hydrophobus 



15 Polyodontophis 



16 Ablabes 



17 SinK>tes 



18 Oligodon 



19 Zamenis 



20 {a) Coluber 



21 (a) Dendrophis 



22 (sq) Tropidonotus 



23 (sq) Helicops 



The Acrochordinae are not represented in 

 Ceylon, except by Chrysydrus Granulatus, which, 

 being practically a Sea-snake in its construction 

 and habits, I have omitted, together with the 

 Hydrophiinae. Gerardia Prevostiana I have also 

 omitted, its existence in Ceylon being doubtful. 



