The terrestrial mammals and birds of North-East Greenland. 



167 



For the zoological museum in Copenhagen were collected 6 

 skins of Ivory-Gulls and the before mentioned 3 eggs from Ren- 

 skæret which vary very little. 



The following measurements have been taken : 



Sex Age Date 



Locality 



Wing Bill Tarsus 



? ad 



? jun. '/.s 06 



c? juv. ^/s06 



C? - 2/g 06 



C? - ^'8 06 



г - '/8 06 



8 06 The pack-ice. Lat. 7540' n. long. 10° w. 323 36 32-5 



— Lat.76°10'n. long. 15° w. In moult 36 36 



— — — 41 38 



— Lat. 7540' n. long. 10° w. 330 38 38 



— Lat.75°50'n. long. iriO'w." In moult 38 35 



— Lat. 75°40' n. long. 10° w. — 38 36 



Eggs. Length Breadth 



June 28'h 1908. 

 Renskæret. 



1 fresh egg in the nest.. 59 42 



1 - . . 60 43 



2 slightly incubated eggs 



one of them broken . . 61 43 



Sabine's Gull. Laras sabini Sab. 



Although I was always on the lookout for Sabine's Gull where- 

 ever suitable localities for this species — islets and skerries near 

 the fleld-ice — were at hand, it was only a few days before the 

 departure of the expedition, that I had the good luck to meet with 

 this species even breeding. 



The further particulars regarding this interesting event are given 

 thus in my diary : July 18'^^ 1908. This noon Gundahl-Knudsen and 

 I landed on Renskæret in a very dense fog in order to photograph 

 the nests of Ivory-Gulls at the south-eastern part of the island ; we 

 were immediately received by a swarm of Arctic Terns (Sterna ma- 

 crura), which nest on the island in vast numbers. Among the high- 

 est fljing Terns I soon observed a Sabine's Gull, which passed 

 over my head without moving its wings and then disappeared in 

 the fog in a northern direction. I stopped for some moments await- 

 ing the return of this rare gull, but in vain ; it seemed to have 

 completely disappeared. The fog increased and it proved impossible 

 to use a field-glass. Then I went, constantly surrounded by scream- 

 ing terns, to the nests of the Ivory-Gulls; I photographed these and 

 walked towards the northern end of the island hoping to see the 

 Sabine's Gull again; the fog was now clearing. I was very much 



