125 
aa0e sHISTRIONICUS TORQUATUS» . (o. & ws ato Vol. V. Pleo XXXTE. 
Harrraur Duck. 
A very rare visitant to Britain ; and when examples do occur, they 
are either females or young males of the first year. 
Genus Harenpa. 
A northern form of a single species. 
Sole THIAREEDAGEACTALIS: ©.) 22°, 8 Nigh Vy Pl REX NAT, 
Lone-tartep Duck. 
A common winter visitant ; arrives in the Scottish firths in great 
abundance during the months of autumn. 
Subfamily MERGIN A. 
The Mergansers are a very distinct family, differing in structure 
and mode of life from the Ducks or Cormorants, to which otherwise 
they are nearly allied. They live on the waters of both the Old 
and the New World, and consist of about ten species. 
Soo. MERGUS CASTOR . <« . + « « » w..-VOls Ve Pl, XXXEY. 
GoosANDER. 
A winter bird, frequenting our lakes when they are not frozen 
over; very destructive to freshwater fish. Always to be seen at 
Slumber in autumn and winter, goes north in summer. 
SOE NUERGUSISERRATOR: geno vulva gu (coll sau VOla. Ve PL eX XY, 
MERGANSER. 
Found in Britain at all seasons; common in the north of Scot- 
land. 
ao4. MERGUS GUCULLATUS . . . . « « Vole Ve PR XXXVI, 
Hoopep MERGANSER. 
An American species, which has occasionally been found in Europe 
and Britain. 
Sia NUERGUS ALBELEUS.«.-. « » « « «Wolk Vi Ply XXXVIE 
Suew, or Nun. 
A winter bird, rather scarce. Breeds in Lapland and the adjoin- 
ing countries. 
Family PODICIPIDA. 
When the birds of the world are taken in review, it is in- 
teresting to note that certain forms are restricted to very limited 
