106 Mr. H. L. Popham on Birds 



-+108. NuMENius ARQUATA. Curlew. 



At Yeniseisk two birds flew over wliicli appeared to be 

 Curlews. 



-i-109. Sterna macrura. Arctic Tern. 



Seen at Yeniseisk and at various places above the forest 

 limit. On one occasion I shot a Tern very much resembling 

 the Arctic Tern, but with a black bill ; it unfortunately fell 

 in a lake full of weeds. It did not appear to be an immature 

 bird. 



110. Pagophila eburnea. Ivory Gull. 



Not observed on the Yenisei, but at the eastern entrance 

 to the Ugor Straits several were to be seen fishing in the 

 patches of open water amongst the ice. All were immature 

 birds, more or less spotted on the back and wings. 



., 111. Larus canus. Common Gull. 



The only Gull observed in the forest district, where it 

 sometimes perches upon the tops of dead trees. One was 

 shot having a plain yellow beak without the greenish base. 



112. Larus fuscus. Lesser Black-backed Gull. 

 One immature bird (probably in the second year's plumage) 

 was shot at Golchika [identified, H. S.]. 



/ 113. Larus AFFiNis. Siberian Herring-Gull. 



This species, in my humble opinion, should rather be 

 called the Siberian Lesser Black-backed Gull, as it more 

 nearly resembles L. fuscus than L. argentatus. It is by far 

 the commonest Gull on the lower reaches of the river, 

 nesting in colonies, mostly on small grassy islands in lakes, 

 occasionally on dry ridges in swampy ground. We obtained 

 a good series of their eggs, which varied considerably, and 

 also specimens in various stages of plumage, from the young 

 in down to the mature bird. The eggs measure : 2*66 to 3 in . 

 by 1-8 to 2-05 in. 



114. Larus marinus. Greater Black-backed Gull. 

 While steaming north in the s.s. * Oftsin,' from Golchika, 

 I saw Gulls which I am confident were Greater Black-backs : 



