RED-CRESTED WHISTLING DUCK. 331 



The whole length 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 shown 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. 



