OF THE BRITISH ISLANDS. 371 



ceptible white tips. Incubation, performed by the female, lasts, 

 according to Naumann, from twenty-one to twenty-two days. 

 Only one brood is reared in the year, and the ducklings are 

 conveyed to the water soon after they are hatched. 



Diagnostic Characters. — (Nuptial Plumage), Anas, with the 

 alar speculum white. Length, 20 to 21 inches. 



2 B 2 



