LONG-TAILED DUCK. 



261 



guislied from young females by being a little larger in size, 

 and in having tlie brown and the white parts about the head 

 and neck rather more pure in colour, and their limits better 

 defined. 



I am indebted to Richard Dann, Esq., for the use of a 

 beautiful scries of examples of this species, from which the 

 various descriptions here given were derived. They were the 

 specimens referred to as shot at various periods throughout 

 the year in different parts of Scandinavia. 



The trachea of the male is about seven inches in length, 

 and very singular in its structure. At the bottom of the 

 tube four window-like apertures, as well as the kidney-shaped 

 tympanum, are closed by a delicate membrane. The vig- 

 nette exhibits this curious structure in two points of view. 

 The windpipe of the female is of the common, or ordinary 

 form, yet both sexes are said to have the same notes. 



