[ 272 ] 



- Genus XCII. DUCK. 

 N" 99. Pink-headed D. N' 100. Barred-headed D. 



,_ Whiftling Swan, Gen, Syn. vi. p. 433. N° I. 



WHISTLING 



&W. ^T'HIS bird fometimes weighs twenty-five pounds*. 



The trachea, or windpipe, enters the breaft-bone; the keel- 

 like procefs of which, in moft other birds, is flat and Iharp, but in 

 this fpecies is very large and hollow. It is into this cavity that 

 the windpipe enters, and, after making a turn, comes out again at 

 the orifice where it entered -f-. 



In America they are not uncommon, efpecially on the borders 

 of the upper lakes, as they breed in the lagoons and marfhy inlets, 

 and migrate to the fouthern provinces with their young, in incre- 

 dible numbers, about the beginning of O£iober J. 



i,_ Black-backed Goofe, Gen, Syn. vl. p. 449. N* 13. 



BLACKlijACK- 



ED G. 



'T^O the defcription given before in the Synopjis, the following 

 may be added. The male differs from zh^ female in having 

 the excrefcence at the bafe of the bill full as prominent and round- 

 ed as in the King Duck ; it is likewife flatted at top in the fame 

 manner; but in the/^»2«/(? it is confiderably fmaller : the glofs on 

 the plumage is alfo more inclining to the green and blue reflec- 

 tions in the male. Both fexes have along and dangerous fpur on 



* Mx.Boys, t Ht, Heyjhant, % Colonsl Davits. 



* the 



