2 Mr. Wing ATE on a ?iew Species of Swan. 



species, is white, except the fore part of the head of the new one, which 

 is spotted with rust colour. The legs are black, and placed further be- 

 hind, and the margin of the inner toes is scalloped. 



It differs, moreover, considerably in its internal anatomical structure. 

 The tube of the trachea, or aspera arteria in its egress, is about two- 

 thirds less in circumference, and, a little preceding the bone of divarica- 

 tion, is swollen ; but in the Cygnusferus at the same part, is much com- 

 pressed, and the bronchial tubes 2| inches longer than in the former, 

 which is a very great mark of specific distinction. The formation of the 

 sternum is also different, and the membraneous portion thereof likewise. 

 Their ribs also vary in number, the new species having only nine on each 

 side, and the other ten. This difference cannot arise from age, sex, or 

 season ; as both species seem nearly mature, both females, and shot 

 about the same time of the year. Therefore, I think (but with due sub- 

 mission to abler ornithologists), it may be safely added, as a perfectly 

 distinct species of Anas, to the British Fauna. 



