532 TIPEEIB^. 



Supraoculars large, separated by 6 to 9 

 series of scales ; scales strongly keeled ; 

 canthus rostralis sharp and raised .... 17. oMnavensis, p. 549.- 



Supraoculars small, sometimes broken 

 up, separated by 8 to 11 series of jux- 

 taposed, convex scales ; scales feebly 

 keeled 18. strigatus, p. 549. 



2. Scales in 27-37 rows, feebly keeled ; ventrals 174-231 ; 



subcaudals 54-90 ; tail not prehensile. 



Scales in 33-37 rows; ventrals 222- 



231 ; subcaudals 75-90 ; 8 or 9 upper 



labials 19. Jlavoviridis, p. 550. 



Scales in 27-31 rows ; ventrals 174-184 ; 



subcaudals 55-76 ; 13 upper labials . 20. cantoris, p. 551. 



3. Scales in 21-27 rows, strongly keeled ; ventrals 160-218 ; 



subcaudals 54^92 ; tail not or but slightly prehensile. 



a. 7 to 9 series of scales between the supraoculars ; scales in 



21 or 23 rows ; ventrals 164-188 ; subcaudals 54-67. 



21. jerdonii, p. 551. 



b. 10 to 15 series of scales between the supraoculars ; scales 



in 23-27 rows. 



Ventrals 183-218 ; subcaudals 72-92 . . 22. mucrosquamatus, 

 Ventrals 182-186 ; subcaudals 72-74 ; [p. 552. 



supraocular large 23. luteus, p. 553. 



Ventrals 160-182; subcaudals 55-76; 



supraocular very narrow, sometimes [p. 553. 



broken up 24. purpureomaculatus, 



4. Scales in 21 rows (rarely 19 or 23), smooth or feebly 



keeled ; 7 to 13 series of scales between the supraoculars ; 

 tail more or less prehensile. 



a. Temporal scales smooth ; subcaudals 53-82. 



Ventrals 145-175 ; snout feebly pro- 

 minent; supraocular narrow 25. gmmineus, p. 554. 



Ventrals 170-187 ; snout prominent, 

 obliquely truncate ; supraocular 

 narrow . , 26. flavomaculatus,'p. 556. 



Ventrals 180-191 ; supraocular large . . 27. sumatranus, p. 557. 



b. Temporal scales obtusely keeled ; ventrals 138-158 ; sub- 



caudals 44—58 28. anamallensis, p. 658. 



5. Scales in 13-19 rows ; 3 to 5 series of scales between the 



supraoculars ; tail prehensile. 



Scales smooth or faintly keeled, in 17-19 



rows ; ventrals 145-170 ; subcaudals [p. 559. 



53-67 29. trigonocephaly. 



