254 



ANATID^. 



the feathers at the base of tlie upper mandible speckled with 

 white, like the adult female of the Scaup ; and with some 

 elongation of the occipital feathers. 



The trachea in this species is about seven inches long, 

 the tube somewhat larger at the upper end, below that of 

 nearly equal diameter throughout ; the figure underneath 

 shows the form of the tympanum. 





