47 
White swan; with the head and neck black; bill black, with two 
knobs at the base; legs orange. 
Anas nigricollis sserreceveee Gmel. Syst. Nat. 1. 502. 
Lath. Ind. Orn, 2. 884. 
Anas melanocephalus so..00. ~ Gmel. Syst. Nat. 1. 502. 
Cygnus Nigricollis...coscseveeeee Steph. Sh. Zool. 12. 17. 
Anas melancorypha .....++ riches Moll. French edit, 213. 
Inhabits the Falkland Isles and the Straits of Magellan. 
3 CYGNUS BEWICKII. 
Cyg.—Albus; rostro atro, baso usque ad nares aurantiaco. 
BEWICK’S SWAN, 
White swan; with the bill black, the base orange to the nostrils. 
FT. IN. IN. 
BIEL ak Sugii cnuces 3 10} DASA paral idneaswies 3 
PP dtevectercncnanss® 4 Middle toe’ ..cinvsesce? 
' White; with the bill black, the basal half yellow, the yellow 
marking truncated at the extremity ; legs and toes black. 
Cygnus Bewickti, and trachea... Yarr. Linn. Trans. vol. 10. 
Hyton, Hist. R. Brit. Birds, 
p. 86. 
Discovered by Mr. Yarrell and Mr. R. Wingate to be an inhabitant 
of the British Isles. 
The trachea of this species during youth penetrates the keel of 
the sternum in a similar manner to that of C. ferus, but may always 
be distinguished by the greater length of the bronchis. As the bird 
approaches maturity the tube at the internal extremity of the portion 
penetrating the sternum takes a horizontal twist, increasing in size 
and the depth to which it penetrates with age. 
CYGNUS AMERICANUS. 
_ Cyg.—Cygno Bewickii similis, sed majore. 
i AMERICAN SWAN. 
Swan like Cygnus Bewickii, but larger. 
