344 NESTS AND EGGS OF NON-INDIGENOUS BIRDS. 

 Family COLYMBID^E. Genus Colymbus. 



WHITE-BILLED DIVER. 



Colymbus adamsi, Gray, 

 (British : rare nomadic winter migrant.) 



The breeding grounds of this Diver are probably 

 circumpolar, and confined to the Arctic regions of both 

 hemispheres. The northern limit is not yet determined. 

 MacFarlane states that this species abounds during the 

 breeding season in Franklin and Liverpool Bays, on 

 the coasts of Arctic America, and was also met with 

 occasionally on the lakes in the interior, but he failed to 

 obtain any authenticated eggs. The two eggs referred 

 to by Messrs. Baird, Brewer, and Ridgway in their Water 

 Birds of North America^ ii. p. 452, as those of this 

 species, may have belonged to the Great Northern Diver, 

 as suggested by MacFarlane. No thoroughly identified 

 eggs are yet known to science. 



