3 



-| — f- Nostril lateral; 22 scales round the 



body d. T. clberii p. 7. 



2. Snout with sharp edge. 



f Rostral extending to between the eyes. 7. T. niultUineatiis p. 7. 

 ft Rostral not extending to between 

 the eyes. 



1. Rostral three fifths the width of 



the head %. T. oUvaceus p. 8. 



2. Rostral not quite half the width of 



the head 9- ^. lorenzi p. 8. 



c. Nasal cleft proceeding from the second 

 labial. 



1. Nasal completely divided. 



aa. Snout rounded; nostril lateral; scales 



in 26 rows 10. T. kapaladua p. 9. 



(5^. Snout with a sharp edge; nostril in- 

 ferior; scales in 24 rows 11. T. depressiccps p. 9. 



2. Nasal incompletely divided. 

 X Nostril inferior. 



a. Rostral 2|j the width of the head, 

 extending nearly to the level of 



the eyes; 18 scales round the body. 12. T. conradi p. 10. 



b. Rostral large ; 22 scales round the 



body 13. Z". bipdrtitus p. 10. 



4. Rostral 1/4 the width of the head, 

 not extending to the level of Ihe 



eyes; 22 scales round the body. 14. T. Jforetisis p. 10. 

 XX Nostril lateral. 



1.20 scales round the body; rostral 

 1/3 the width of the head, extending 

 to the level of the eyes 15. T. leiiroprcctus p. 11. 



2. 22 scales round the body ; rostral 

 narrow, the upper portion Ys the 

 width of the head, extending nearly 



to the level of the eyes 16. T. jlavivoiter p. il. 



3. 26 scales round the body ; rostral 

 narrow, the upper portion '/s the 

 width of the head, extending to 



between the eyes or nearly so . . 17. T. nigroaUms p. 12. 



4. 26 or 28 scales round the body ; 

 rostral V.2 the width of the head, 

 not extending to the level of the 



eyes 18. T. mulleri p. 12. 



