Birds of East Prussia. 517 



Arenar[a interpres (L.). 



Not common on migration in autumn. 



HvEMATOPUS OSTRALEGUS_, L. 



Very rare on migration, 



Cygnus olor (Gm.). 



Breeds in small numbers on some of the greater lakes. 

 The ''Anas cyynus" of Bock (' Naturforscher/ 1778) is not 

 the Anas cygnus of Linnseus, but Cygnus olor. 



Cygnus cygnus (L.). 



Numerous in spring and autumn, sometimes in the midst 

 of winter. 



Anser finmarchicus, Gunn. 



I once saw a specimen in the hands of a bird-stuffer, which 

 I believed to belong to this species, but I could not find it 

 again for re-examination. 



Anser segetum (Gm.). 



Passes through in great numbers, chiefly in October and 

 March. 



Anser arvensis, Brehm. 



I saw two specimens, killed near Konigsberg in 1881, which 

 quite agreed with the description of this form. 



Anser anser (L.). 



Passes through early in autumn and in spring, but is 

 much less numerous than Anser segetum. I do not know 

 of its breeding in East Prussia at the present time. 



Anser albifrons (Scop.). 



Rather rare on the Baltic Sea and on the Haffs late in 

 autumn. 



Branta LEUcopsis (Bcchst.) . 



Bare on the sea -coast and on the Kurische Haff. 



Branta bernicla (L.). 



Not rare on the sea-coast, and occasionally found in the 

 interior. 



