Or THE BEITISH ISLANDS. 415 



Genus HARELDA, or Long=tailed Ducks. 



Type, HAEELDA GLACIALIS. 



Harelda, of Stephens (1824). The Long-tailed Ducks are distinguished 

 by their uniform brown primaries. The head is fully crested ; the bill is strong 

 and conical, but with no overhanging membrane at the base; the edges of the 

 upper mandible bent inwards to some extent. The long-pointed central tail 

 feather of the male is another well-marked characteristic of the genus. 



But one species of Long-tailed Duck is known, a British species, the dis- 

 tribution, habits and characteristics of which will be fully described in the 

 following chapter. 



