170 ■A- L. V. Manniche. 



gravel and is nearl}' flat. The nests were lying some 25 meters 

 from the sea. 



It is difficult to distinguish a flying Sabine's Gull from an Arc- 

 tic Tern on places, where the last is prédominent in numbers. The 

 best distinctive mark is the black primaries of the gull; these can 

 in some cases plainly be seen. 



There is no great difference between the size of the two birds 

 and the different colour of the head is not very conspicuous. On 

 dissection of the killed Sabine's Gulls I found in the stomach of 

 one of them a few small jaws of cuttle-fish ; the two other stomachs 

 were empty. As it seemed strange to me, that three nesting Sa- 

 bine's Gulls appeared and not an even number, I visited Renskæret 

 again July 22*^^ at the departure of the expedition from Danmarks 

 Havn, in order to see the fourth gull if possible. This time I stayed 

 on the island for more than 4 hours but did not see any Sabine's 

 Gull, and 1 feel sure, that there were none. 



The Norwegians may perhaps have shot the fourth gull. 



On the three skins and two eggs, which were handed over to 

 the zoological museum in Copenhagen the following measurements 

 have been taken : 



Sex Age 



? ad. 



Arctic Tern. Sterna macnira Naumann. 



The Arctic Tern breeds in great numbers on all smaller islands 

 and skerries as well near the field-ice as in the bays and firths. 



Only exceptionally I met with smaller nesting colonies on the 

 mainland. (Islets in fresh-water-lakes and projecting points.) 



Koch and Bertelsen observed this species farthest North in 

 the open water by Mallemukfjeldet. (June 9"^ 1907; lat. 80° 20' n.) 



1 Renskæret is 850 meters long; its greatest breadth is 380 meters. The distance 

 from Maroussia is 1880 meters, from Maatten 1120 meters and from Кар Bis- 

 marck 1780 meters. 



