99. CONTIA. 



257 



c. Eight upper labials; ventralslSS; subeaudals 50 ; scales 

 in 17 rows 17. paehyura, p. 267. 



2. Nasal divided or semidivided ; scales in 15 rows ; ventrals 

 147-167 ; subeaudals 29-39. 



Two postoculars 18. mitis, p. 267. 



Three postoculars 19. gemiannulata, 



[p. 268. 



II. Eostral 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- 



] 37 ; subeaudals 23-40 20. nasus, p. 268. 



Nasal divided ; ventrals 141-160 ; sub- 

 eaudals 38^8 21. frontalis, p. 270. 



Table showing Nttmbbks op Scales and Shields. 

 I. Old-World species. 



II. American species. 



^ 



VOL. 11. 



