356 



ANATIM;. 



The female is dark brown on all those parts which in 

 the old male are black ; the white of the under surface of 

 the body less pure in colour, being tinged with grey, or 

 pale ash brown ; the speculum of the wing white, as in 

 the male. 



I have seen a dead female that was known to be old, 

 with the feathers at the base of the 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 under- 

 neath shows the form of the tympanum. 



