214 COIUBKID^. 



tt Eye about half as long as the snout; ventrals- 

 147-175 ; suboaudals 55-65. 



Nostril much nearer the internasal than 



the first labial 12. miniatum, p. 222. 



Nostril not nearer the internasal than 



the first labial 13. virgatum, p. 223.. 



b. A single pair of chin-shields . . 14. ruficeps, p. 223. 

 2. Ventrals 110 11. canula, p. 222. 



B. Prontal pentagonal, or very slightly angulate in front. 



Anterior chin-shields shorter than the 



posterior and separated from the 



symphysial 15. bocourti, p. 224. 



Anterior chin-shields longer than the 



posterior and in contact with the 



symphysial 16. reticulatum, p. 224. '^ 



II. Frontal more than twice as broad as the posterior border of the- 

 supraocular. 



A. Eostral small, scarcely visible from above ; seven upper 



labials ; two postoculars 17. moestum, p. 225. 



B. Eostral large, well visible from above. 



1. Seven upper labials. 



a. Anal entire 18. vermiforme, p. 225. 



b. Anal divided. 



Frontal scarcely longer than broad ; upper 



portion of rostral about half as long as 



its distance from the frontal 19. breve, p. 225. 



Frontal considerably longer than broad ; 



upper portion of rostral about half as 



long as its distance from the frontal . . 20. atriceps, p. 226. 

 Upper portion of rostral about two thirds 



as long as its distance from the 



frontal 21. planicejps, p. 226. 



2. Six upper labials ; one postocular. 



Upper portion of rostral much shorter [p. 227» 



than its distance from the frontal .... 22. calamarinum, 



Upper portion of rostral nearly as long 



as its distance from the frontal 23. gracile, p. 228, 



