362 NATATORES. HARELDA. 



and abdomen chestnut-brown, becoming darker as it ap- 

 proaches to the vent, which latter, and the under tail- 

 coverts, are black. Tertials long and curved ; the inner 

 web narrow, and, with the shaft, white ; the outer web 

 broad and black. Quills and tail brownish-black ; the 

 latter more elongated and pointed than in the rest of this 

 genus. 



GENUS HARELDA, RAY. HARELD. 



GENERIC CHARACTERS. 



BILL much shorter than the head, high at the base, narrow, 

 suddenly contracted towards the tip ; nail of the upper man- 

 dible arched ; both mandibles laminato-dentato, with the 

 laminae prominent, tooth-like, and widely set. Nostrils near 

 the base of the bill, lateral, linear, oblong. 



Wings of mean length, with the first and second quill 

 feathers equal. 



Tail wedge-shaped, the feathers sharp pointed. In the 

 male bird the two middle feathers elongated, narrow, and 

 canaliculated. 



Legs short. Feet four-toed, webbed; the outer toe nearly 

 as long as the middle one. Hind toe with a large lobated 

 membrane. 



Of this genus only one species has hitherto been discovered, 

 viz. the Long-tailed Duck of British authors. In its affinities 

 it seems nearly allied to the Garrots (genus Clangula), but is 

 still separated from them by characters of much importance, 

 the bill being more contracted towards the tip, and not being 

 so high at the base, near which also the nostrils are situated. 

 The tail is also more graduated and acute, and remarkable 

 in the males for the elongation of the two central feathers. 

 The anatomy of the tracheae separates it, too, from both the 

 Garrots and the Pochards, This species lives on sea-shores, 

 and is a native of the Arctic regions. 



