120 ^- L- V. Manniche. 



The Divers vary greatly in size. As a rule the males are by 

 far the largest. 



This species always appears in North-East Greenland in full 

 summer plumage. 



For the zoological museum in Copenhagen was collected the 

 skins of 3 old birds and one almost full-grown young one and 

 two eggs. 



The following measures have been taken: 



Sex Age Date Locality Wing Bill Tarsus 



mm. mm. mm. 



(^ ad. i'/8 06 Кар Bismarck 289 53 71 



(^ - 27/g06 Hvalrosodden 278 53 71 



Ç - ^4i 07 The ship's-harbour 267 52 68 



Eggs. 



Length Breadth 

 mm. mm. 



^h 08 The ship's-harbour I 



Great Northern Diver. Colymbus glacialis L. 



Only once I met with this species. 



While I stayed on Hvalrosodden from August 20"^ to Sep- 

 tember 2"^^ 1906 I observed 5 Great Northern Divers every day 

 lying in Dove Bugt usually not far from the coast and just off my 

 tent; they were all old birds in summer plumage and extremely 

 vigilant and shy. My attempts to get within gun shot failed even 

 when they had retired to rest on the pack-ice by the shore. 



When the Divers were searching for food and observed no dan- 

 ger they were so busy in their work, that they only appeared on 

 the surface for a few moments. 



Their power of submergence is great and seems to exceed by 

 far that of C. septentrionalis. 



The Great Northern Diver breeds farther South on the East 

 coast (According to Bay: Meddelelser om Grønland, Vol. 19, 1896, it 

 is common at Scoresby Sound) but appeared only as an accidental 

 visitor in North-East Greenland. I very much doubt that it breeds 

 here, and this I think is due to the fact, that the large deep moun- 

 tain lakes, the favorite breeding localities of this species, only very 

 late in the season — in some years never — become free from ice. 



