OOHXIA. 



267 



c. Eight upper labials; ventralsl33; subcaudals 50 ; scales 

 in 17 rows 17. pachyura, p. 267. 



-. .Vasal divided or semidivided; scales in 15 rows; ventrals 

 117 I ii7 ; subcaudals 29-39. 



Two postocnlars 18. mitig, p. 267. 



Three postoculars 19. semiannulata, 



[p. 268. 



II. llostral large, the portion seen from above as long as or a little 

 shorter than its distance from the frontal ; scales in 17 rows. 



Nasal entire or semidivided ; ventrals 110- 



137 ; subcaudals 23-40 20. narus, p. 268. 



Nasal divided ; ventrals 141-160 ; sub- 

 caudals 38-48 21. frontali*, p. 270. 



TABLE SHOWING NUMBERS OF SCALES AND SHIELDS. 

 I. Old-World species. 



II. American species. 



VOL. II. 



