12 BIRDS AND MAMMALS OF EAST SIBERIA [ Vol. V 



Siberian coast. At Cape Irkaipij, Sept. 5, 1911, a young bird was 

 taken. July 12, 1912, a pair were observed, thirty miles east of 

 Cape Caranov, seemingly not breeding. 



Mathews in ' The Birds of Australia ' uses the name Caprothere^ 

 jpomarinvs camtschatica (Pallas) for the pomarine jaeger of East 

 Siberia and Alaska (breeding), on just what grounds we cannot 

 make out, as he gives no reason for so doing. We cannot ourselves 

 find any differences that are constant, and that would seem to indi- 

 cate two subspecies, in the many skins we have compared. Per- 

 haps, however, we have overlooked something that Mathews has 

 found out about these birds. 



Stercorarius parasiticus (Linn.). 



Rather less common than the next species on the Arctic coast 

 of Siberia, but foimd all the way along. 



Two pairs of birds, with their eggs, were taken, as follows. 

 June 26, 1912, on an island in the Delta of Kolyma, a set of two 

 eggs was found on a dry spot in a grassy swamp; both parent birds 

 were of the light color phase. July 5, 1912, at Medwjedschij River, 

 one egg, on dry moss in a swamp; both parents were of the light 

 color phase. 



No significance may attach to the fact, which, however, is of 

 some interest, that the one nest found by Koren in Alaska, — 

 Kodiak Island, June 19, 1911, — -belonged to birds both in the 

 dark color phase. 



Stercorarius longicaudus Vieill. 



The long-tailed jaeger arrived at Nijni Kolymsk, in the spring 

 of 1912, long before the break-up of the river. A specimen was 

 taken May 22. 



A remarkable nest of this species was found June 22, 1912, 

 at Kalaschkowo, Kolyma, containing two nearly fresh eggs. The 



