380 
Synopsis of the Birds 
and accidental visitant in Italy. Trachea forming two cir- 
cumvolutions before entering the sternum.* 
73. ANAS. 
Anas , L. Gm . Briss . Bath. III. Cuv. Vieill. Temm. Bans . 
Anas , Brehm. Nob. Obs. and Cat. of birds of the U. S. 
Tadorna, Cairina , Anas, Rhynchaspis, Dafila, Mareca, Quer- 
quedula, Steph. 
Bill broader than high at base, more or less broader at 
tip than at base, somewhat flattened, much depressed towards 
the point, obtuse, marginal teeth lamelliform, weak ; upper 
mandible convex, curved and unguiculated at tip, nail slen- 
der ; lower narrower, flat, entirely covered by the margins 
of the upper : nostrils basal, approximated, oval, small, open, 
pervious, covered by a membrane : tongue fleshy, thick, 
broad, fimbriated on the sides, obtuse. Head small ; neck 
slender, subequal to the body : body much compressed, slen- 
der. Feet nearly central, rather small and feeble ; tarsi sub- 
* 2. Cygnus olor, Vieill. White ; bill red margined with black ; bare 
space round the eye, and a fleshy knob on the forehead, black. 
Young dark cinereous. 
Mute Swan , Lath . Cigno reale, St. degh. ucc. v. pi. 554. Cygnus gib- 
bus, Beehst. Anas olor , Gm. 
Inhabits the eastern part of Europe, and Asia: never observed wild in 
America. Domesticated throughout the world. Trachea without cir- 
cumvolutions. 
3. Cygnus nigricollis, Steph. White, head and neck black, bill red. 
Black-necked Swan, Lath. Anas nigricollis et melanocephala , Gm. 
Mot figured. Scudder's Museum, Mew - York. 
Inhabits South America: common at the Falkland Islands, and the 
Straits of Magellan. 
4. Cygnus atratus, Steph. Black, quill feathers white, bill red. 
Black Swan , Lath. Anas atrata, Lath. Anas plutonia , Shaw Mat. 
Misc. pi. 108. Philadelphia and Mew- York Museums. 
Inhabits Australia. 
