GREBES. 69 
BLACK-THROATED DIVER. Colymbus arcticus, Lin- 
neus. 
Resident in Scotland and the Hebrides, where it 
breeds in limited numbers; a winter visitant to 
England and Ireland. 
RED-THROATED DIVER. Colymbus septentrionalis, 
Linneus. : 
Resident in Scotland and the Hebrides, where it 
breeds ; a winter visitant to England and Ireland. It 
may be observed that all three species of Diver occa- 
sionally remain about their winter quarters long 
enough to acquire the full breeding-plumage. 
Fam. PODICIPT DA. 
GREAT CRESTED GREBE. Lodiceps cristatus (Lin- 
neeus). 
A local resident, migrating southward in winter. 
RED-NECKED GREBE. Podiceps rubricollis (Gmelin). 
A winter visitant, sometimes (though rarely) remain- 
ing late enough in spring to display the complete 
breeding-plumage. It is of rare occurrence in Ireland. 
SCLAVONIAN GREBE. JPodiceps cornutus (Gmelin). 
The same remarks apply as to the last named. 
