2. TTPHLOPS. 9 



Rostral two fifths the width of the head . . 13. coynorensis, p. 21. 

 Rostral more than half the width of the 



head 25. tJiurstonii, p. 26. 



ttX 22 or more scales round the body ; diameter of 

 body 29 times or more in the total length. 



§ Tail not longer than broad, ending in a 

 spine. 



^ Rostral one third, or hardly one third, 

 but more than one fourth, the width of 

 the head. 



24 scales round the body ; praeocular 



broader than the ocular 14. socotramts, p. 21. 



22 or 24 scales round the body ; rostral 



rather more than one third the width of 



the head ; diameter of body 40 times or 



more in the total length 15. vermicularis, p. 21. 



24 or 26 scales round the body ; diameter 



of body not 40 times in the total length . . 16. diarcU, p. 22, 

 24 scales round the body ; three concavities [p. 23. 



or pits under the snout 17. hothriorhynchus, 



22 scales round the body ; rostral not 



quite one third the width of the head . . 19. siamensis, p. 24. 

 26 scales round the body ; praeocular a little 



broader than the ocular 20. nigroalbus, p. 24. 



^^ Rostral hardly one fourth the width of 

 the head, not extending to the level 

 of the eyes : 24 scales round the body. 

 18. oatesii, p. 23. 



^IIII Rostral half the width of the head, 

 not extending to the level of the eyes ; 

 26 or 28 scales round the body. 



21. muelkri, p. 25. 



§§ Tail slightly longer than broad, rounded at 

 the end, without spine ; 24 scales round 



the body 22. madagascarieyisis, 



[p. 2b. 



§§§ Tail longer than broad, ending in a spine ; 

 22 scales round the body. 



Rostral about one third the width of the 



head 23. Jlaviventer, p. 25. 



Rostral nearly half the width of the head . 24. tJieobaldianus, 



[p. 26. 



