600 CLASS AVES. 



Dark-ash ; head, neck, and tail, black streaked, and 

 throat, white ; bill and feet, black ; tail of eighteen 

 feathers. 



Ana. Canadensis, Vieill. Bernicla Canadensis^ 

 Boie. North America ; breeds with An. Anser. 

 Cygnus Canadensis, Steph. 



We can hardly separate from the swans certain 

 birds, less elegant indeed, but with the same bill. 

 Many of these have a tubercle at its base. 



Chinese Swan. Anas Cygnoides. L. Enl. 34<7. 



This species is brought up in our poultry yards, 

 where they breed easily with the geese. Of a whit- 

 ish-grey, with a grey -brown mantle. The male may 

 be known by a little tuft of feathers which hangs 

 under the bill, and by a large tubercle which sur- 

 mounts the top of it. Swan Goose^ Berwick. Cyg- 

 nus Sinensis, Steph. 



Some have the bend of the wing armed. They 

 form the genus Plectrophanes, Leach, (not Meyer). 



Spur-winged Swan. A^ias Gamhensis, L. Lath. 

 Syn. III. p. % pi. 102, 



Is a much rarer species, so named by its first de- 

 scribers. Is remarkable for its size, its high legs, 

 and the tubercle on its front, and by the two thick 

 spurs with which the bend of the wings is armed. 

 Its plumage is purple-black ; the throat, fore- 



