60. COLUBER. 27 



** Rostral broader than deep. 



t No subocular below the prseocular. 



X Scales in 23 rows or more ; third labial not 

 entering the eye. 

 Scales in 33 rows, smooth or faintly keeled ; 



ventrals 247-200 ; subcaudals 112 .... 10. cJihrosoma, i^.38. 

 Scales in 27 to 33 rows, faintly keeled ; 



ventrals 252-266; subcaudals 102-119. 11. Jlauirnfus, p. 39. 

 Scales in 25 to 31 rows, faintly keeled on 



the posterior part of the body ; ventrals 



200-239 ; subcaudals 60-88 12. guUatus, p. 39. 



Scales in 25 or 27 rows, all perfectly smooth ; 



ventrals 222-260 ; subcaudals 68-89 . . 13. leopardinus, p. 41. 

 Scales in 23 or 25 rows ; ventrals 201-228 : 



subcaudals 60-66 14. liohenackeri, p. 42. 



X\ Scales in 23 rows ; third and fourth labials 

 entering the eye ; ventrals 208-222 ; sub- 

 caudals 62—74 15. mandarinits, p. 42. 



Ill Scales in 21 rows; ventrals 162-190; sub- 

 caudals 47-68 16. rufodorsatus, p. 43. 



tt A subocular below the prasoeular ; scales in 23 

 to 27 rows ; ventrals 172-214; subcaudals 50- 

 80 17. dione, p. 44. 



/3. Scales feebly but distinctly keeled, in 23 or 25 rows. 



* Frontal considerably longer than broad. r„ ^5 

 Ventrals 195-234; subcaudals 63-90 .... 18. quatuorlineatus, 

 Ventrals 230-284 ; subcaudals 90-107 . . 19. Ueniurus, p. 47. 



** Frontal not or but slightly longer than broad. 



Scales in 23 rows ; ventrals 208-221 ; sub- 

 caudals 61-76 ; loreal considerably 

 longer than deep 20. schrenckH, p. 48. 



Scales in 25 rows (rarely 23 or 27) ; ventrals 



200-234; subcaudals 67-85 21. vulpinus, p. 49. 



3. Scales strongly keeled, in 27 rows . 40. lineaiicollis, p. 64. 



B. Ventrals with a distinct, though often very obtuse, lateral keel. 

 1. Anal usually divided ; scales in 21 rows or more. 

 a. Subcaudals less than 125. 



a. No subocular below the prseocular. 



* Scales in 25 to 29 rows. 



Scales smooth or very faintly keeled 22. Jcphts, p. 49. 



Scales very distinctly keeled 23. obsoletus, p. 50. 



