EARED GREBE. 273 



and habits. Perhaps it may be that in families of which 

 the species are few, as in this, these species vary more in the 

 form of the bill, so that each in reality may represent a 

 genus in those families of Avhich the species are very 

 numerous. On account of a slight difference of this kind, 

 although, perhaps, more obvious than in the other species, 

 our common Dabchick has been promoted to generic dis- 

 tinction. 



VOL. V. 



