336 ANATID^E. 



head, and all the back of the neck, dusky greyish-brown ; 

 back and wings darker grey than that of the males ; quill- 

 feathers like those of the males; no bright- coloured spe- 

 culum in either sex ; chin and throat pale greyish-brown ; 

 lower part of the neck in front dark brown ; all the under 

 surface of the body uniform dull greyish-white ; under 

 tail-coverts dark grey ; legs and feet as in the male. 



Young males at first resemble the females, obtaining 

 some change with the feathers of their first autumn moult ; 

 the change in the colour of the feather going on by slow 

 degrees afterwards. As late as the middle of January, 

 young males of the previous summer had not attained their 

 perfect plumage ; and Dr. Fleming mentions that the 

 black on the breast of the young males does not make 

 its appearance during the first year. 



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

 the diameter of the tube large, tapering suddenly towards 

 the bottom ; the labyrinthic tympanum of beautiful form ; 

 the bronchial tubes short. The engraving below repre- 

 sents the surface opposed to the left side of the bird. 



