103 
POGONIUS. 
Character genericus, pag. 45. 
- In describing the species of this genus in page 47 of this 
Volume, I remarked, that other species without a sulcated 
beak might be found; nor have I conjectured falsely. This 
shews the necessity of being extremely cautious in making 
use of comparative characters alone, which has often pre- 
vented the discovery of new species. 
PD 
