BLAPIN^. 311 



o. Habit colubriform or elapiform. 



* Internasals distinct ; rostral moderate, 

 t Scales not oblique, smooth. 

 t Ventrals rounded. 



Eye moderate or rather small; canthus roatralis distinct; sub- 

 caudals all or part in two rows . . 218. Pseudechis, p. 327. 



Eye moderate or small ; canthus rostralis feebly marked or absent ; 

 subcaudals single (with one exception). 219. Denisonia, p. 332. 



Eye very small ; subcaudals in two rows. , 220. Illicropecliis, p. 346. 



tt Ventrals angulate and notched laterally ; sub- 

 caudals single. , 221. Hoplocephalus, 



[p. 348. 



tt Scales not oblique, strongly keeled ; subcaudals 

 single 222. TropideoMs, p. 350. 



ttt Scales oblique, smooth, laterals shorter than 

 dorsals ; subcaudals single. 



223. Notechis, p. 351. 



** Internasals absent ; rostral very large ; subcaudals 

 single 224. Rhinhoplocephalus, 



(3. Habit viperiform. [p. 352. 



Scales smooth ; subcaudals single . . 225. Brachyaspis, p. 353. 

 Scales more or less distinctly keeled ; posterior subcaudals paired ; 

 end of tail compressed, terminating in a long spine. 



226. Acanthophis, p. 354. 



6. Head not distinct from neck ; subcaudals in two rows. 



Scales not oblique ; tail moderate ; nasal divided. 



228. Boulengerina, p. 357. 

 Scales oblique ; tail very short ; nasal divided. 



229. ElapecMs, p. 358. 



Scales not oblique ; tail very short ; nasal entire. 



230. Rhynchelaps, p. 361. 



4. No maxillary teeth beyond the poison-fangs ; nasal entire ; 

 subcaudals single 227. Blapognathizs, p. 356. 



B. Maxillary bone not extending forwards beyond the palatine ; 



vertebral scales enlarged 231. Bungarus, p. 365. . 



C. Maxillary bone extending forwards beyond the palatine; 



vertebral scales not enlarged. 



1. Internasal bordering the nostril. 

 a. Poison-fangs followed by one or more small teeth ; scales 

 oblique 232. Naia, p. 372, 



