236 DUTCH AND ENGLISH BIRDS. 
Order PYGOPODES. 
Genus Colymbus. 
Colymbus glacialis Linn. 
A rare winter visitor to the coasts of Holland. Is believed 
to breed in some of the Shetland Islands. 
A winter visitor elsewhere on the coasts of the United 
Kingdom. 
Some adults often stay till June even in S. and W. (H.8.). 
Colymbus arcticus Linn. 
Visits Holland on migration in small numbers. 
In the Br. Isl. it breeds in the north of Scotland. 
Colymbus septentrionalis Linn. 
Visits Holland on migration during the winter; in lar- 
ger numbers than the two preceding. 
Visits the British coasts on migration almost all the. 
year round, breeding in the north of Scotland and Ireland. 
Genus Podiceps. 
Podiceps cristatus (Linn.). 
A summer visitor to Holland, breeding on all larger 
lakes and marshes. 
In the British Islands it breeds in small numbers on 
some of the lakes of England and Ireland, occurring on 
migration and in winter elsewhere. 
Podiceps griseigena (Bodd.). 
Breeds in Holland in the same places as the preceding 
but in smaller numbers — and occurs also on migration 
from autumn till spring. A rare visitor on migration in 
the Br. Islands. 
Podiceps auritus (Linn). 
A scarce winter visitor to Holland, having bred in Noord- 
Brabant (Koller, Vog. v. Ned., p. 64). 
INotes from the Leyden Museum, Vol. XV. 
