10 BIRDS AND MAMMALS OF EAST SIBERIA [^' vi^.' V*^' 



Larus hyperboreus Gunnerus. 



This species was abundant all the way from the Diomede Islands 

 to the Island Delta of Kolyma. On June 26, 1912, thi-ee slightly 

 incubated eggs were taken from a nest placed on a high grass-grown 

 turf at the Island Delta of Kolyma. July 12, 1912, a dozen pairs 

 were found breeding with some Vega gulls on a little island in a 

 tundra lake, thirty miles east of Cape Bolshaja Baranov; the eggs 

 were then in an advanced stage of incubation. Sept. 10, 1911, at 

 Cape Kibera Island, many fully fledged young were observed 

 still being fed by their parents. Two specimens were preserved, 

 an adult female from Cape Bolshaja Baranov, July 6, 1912, and a 

 young bird from Diomede Islands, Dec. 7, 1912. 



It is of interest, we think, that the glaucous-winged gull {Larus 

 glaucescens Naumann) breeds in a large colony on top of the high 

 Amak Island, but never was seen north of this point by Mr. Koren. 



Larus vegae Palmen. 



An abundant species along the Arctic Siberian coast. Eggs were 

 taken June 26, 1912, on an island in the Delta of Kolyma, from a 

 nest built of dry grass and placed in the roots of a large tree trunk 

 drifted ashore. Other eggs, somewhat advanced in incubation, 

 were secured from the colony breeding with glaucous gulls in the 

 tundra lake, thirty miles east of Cape Bolshaja Baranov, July 12, 

 1912. Sept. 10, 1911, fully fledged young, still being fed by their 

 parents, were seen at Cape Kibera Island. Two skins were saved. 



Larus canus Linn. 



A few mew gulls were seen May 21, 1912, at Kolyma River (River 

 Annuj) long before the break-up of the river. Mr. Koren's notes 

 make no other mention of the species. 



