Birds. 



1379 



black) changes to a much darker tint, which extends over the breast 

 and shoulders. The wings nearly resemble those of the ferruginous 

 duck in colour and markings, but are much larger. A feather from 



Supposed Hybrid Duck. 



the axillary plume has the form of the corresponding feather in 

 the common pochard, but resembles that in the ferruginous duck, in 

 being freckled at the end. The bird proved, on dissection, to be a 

 male, and we have endeavoured to show in the centre figure of 

 the engraving below, the form of the bony enlargement of the trachea. 



a. Bony labyrinth in the Trachea of the Common Pochard, b. The same part in the supposed Hybrid, 

 c. The same part in the Ferruginous Duck. 



The figure on the left hand represents the same part in the common 

 pochard, and that on the right in the ferruginous duck. The speci- 

 mens from which the two latter drawings were made, were kindly lent 

 us by Mr. Yarrell. It will be seen that, although the trachea of the 

 hybrid bird resembles in some respects that of the nyroca, it approxi- 

 mates more closely to the common pochard. 



Scaup Duck, Fuligula marila. Not unfrequently killed in autumn, 

 spring, and winter. 



