176 
DUSKY DUCK. 
migratory. Numbers of them remain during the summer, and 
breed in sequestered places in tbe marsh, or on the sea islands 
has much of habits of the common eider. One or two specimens have 
been killed on the northern shores of Great Britain. < 
Clangula, Leach. 
2. C. Barrovii, Swain, and Richard. — Rocky Mountain Garrot. See 
note top. 82 of this volume. 
Cygnus, Steph. 
Wilson, in his list of birds, mentions the “ swan but from three species at 
least being natives of the Arctic countries, it is impossible to say whether 
or not he was aware of any distinctions. 
3. C. musicus, Bechst., or Wild Swan. — Inhabits the Arctic circle, whence 
it migrates to both continents. 
4. C. buccinator, Richardson. — Trumpeter Swan. — Discovered to be un- 
described by Dr Richardson during the last overland expedition ; dis- 
tinguished by the bill being entirely black, longer and more, depressed 
than in the common wild swan, the tail containing twenty-four feathers, 
and by a difference in the folding of the windpipe. The Doctor remarks, 
it is the most common swan in the interior of the fur countries. It 
breeds as far south as lat. 61 deg., but principally within the Arctic circle, 
and in its migrations generally precedes the geese a few days. It is to 
the trumpeter the bulk of the swan skins imported by the Hudson’s Bay 
Company belong. 
5. C. Bewickii, Yarrel. — Bewick’s Swan — This bird has lately been dis- 
covered as a migratory visitant to Britain. Dr Richardson met with it 
during the last expedition, and remarks : — “ This swan breeds on the 
sea-coast, within the Ai-ctic circle, and is seen in the interior of the fur 
countries, in its passage only. It makes its appearance among the latest 
of the migratory birds in the spring, while the trumpeter swans are, 
with the exception of the eagles, the earliest.” 
Lewis and Clarke, Lawson, and Hearne, were all aware of the difference 
among the American swans, but they have never, till lately, been really 
distinguished and characterised. 
Anser, Bechst. 
6. A. albifrons, Bechst. — White-Fronted Goose. — Is mentioned by 
Bonaparte, and is introduced in the Northern Zoology. Its breeding 
2 
