RED-CRESTED WHISTLING DUCK. 333 



The whole length is twenty-two inches. From the 

 carpal joint to the end of the first quill -feather, which is 

 the longest in the wing, ten inches and a half. 



The female is without a crest ; the top of the head dark 

 brown ; cheeks, throat, and sides of the neck greyish- 

 white ; upper surface of the body pale rufous brown ; point 

 of the shoulder and the speculum greyish-white; breast 

 reddish-brown ; the other parts of the under surface grey- 

 ish-brown ; beak and legs reddish-brown. 



The windpipe of the male is about nine inches in length, 

 the tube is narrow in diameter at the middle, and near the 

 end, but enlarged at the commencement and again below 

 the middle, as shewn in the representation of the lower 

 half inserted on the opposite page. The labyrinth in the 

 Ducks of this division is composed partly of bone, and 

 partly of membrane. The right and left surface are here 

 shown ; the membrane supported by delicate portions of 

 bone diverging from an outer bony ring. 



