216 coltjbridjK. 



Suture between the internasals as long 



as or shorter than that between the 



prsefrontals ; frontal moderate .... 3. cyclurus, p. 219. 

 6. A single anterior temporal. 

 Portion of rostral seen from above 



shorter than its distance from the 



frontal 4. albocincttis, p. 220. 



Portion of rostral seen from above as 



long as its distance from the frontal . 5. formasanus, p. 222. 



2. Scales in 17 rows. 



a. Pourth and fifth labials entering the eye; a single 

 anterior temporal 6. violaceus, p. 222. 



6. Fourth or third and fourth labials entering the eye. 



a. A single labial entering the eye ; a single anterior 

 temporal 7. woodmasoni, p. 223. 



/3. Two labials entering the eye ; two superposed anterior 

 temporals 8. octolineatus, p. 224. 



y. Two labials entering the eye ; a single anterior tem- 

 poral. 



* Two postoculars. 



Loreal longer than deep 9. phesnochalinus, p. 225. 



Loreal rather deeper than long 10. forhesii, p. 225. 



** One postocular. 



Scales smooth 11. signatus, p. 226. 



Scales feebly keeled 12. subcarinatus, p. 226. 



3. Scales in 15 rows 13. annuKfer, p. 226. 



B. Portion of rostral visible from above much shorter than its 

 distance from the frontal ; scales in 17 or 19 rows. 



Temporals 1 + 1 + 2; ventrals 146-169; 



suboaudals 30-47 14. tceniatus, p. 227. 



Temporals 1 + 2 or 2+2; ventrals 170- 



191 ; subcaudals 55-60 15. chinensis, p. 228 



II. Anal divided. 



A. Scales in 19 rows 16. vaillanti, p. 228. 



B. Scales in 17 rows. 



1. Ifasal undivided ; fourth and fifth labials entering the eye; 



ventrals 167-168; subcaudals 43-46. 



17. beddomii, p. 229. 



2. Nasal divided, rarely semidivided. 



Third and fourth labials entering the 

 eye ; ventrals 1 70-202 ; subcaudals 

 41-59 , 18. arnensis, p. 229. 



