418 Dr. E. Hartert on Birds from 



L. argentatus cachinnans plainly enough by the colour of the 

 feet. Mr. W. PI. Kobbe's article in 'The Auk/ 1902, 

 pp. 19-24, may be of some interest with regard to the Gulls 

 visiting the Californian coast in winter (though I believe 

 American ornithologists have long been aware of the facts 

 mentioned by this author), but his attempt to unite the 

 North-European argentatus and the East-Siberian vegce, after 

 the examination of a series of American non-breeding birds, 

 had better have remained imprinted. 



[These birds I secured at Bulun, where they were nesting. 

 The young I saw at Vitim and further up the stream after 

 8. viii. 1903. This was the first date that I noticed the young 

 flying. The Bulun birds were being terrorised by a Falcon, 

 which would occasionally sally out from the cliffs and chase 

 the timid Gulls away.] 



3. Larus canus Briinn. 



Larus canus Briinnich, Orn. Bor. p. 43 (1764: Iceland). 

 ? ad. 10 miles west of Yakutsk, 22. vi. 1903. (No. 117.) 



? ad. 200 miles below Yakutsk, 1. vii. 1903. (No. 151.) 



"Iris yellow; orbital ring red; legs and feet yellowish 

 (olive-yellow); bill deep olive-brown, tip yellow." 



[Au example of this species was shot on a lake some ten 

 miles west of Yakutsk. Others I found nesting on the 

 floating weeds of a lagoon adjacent to the river immediately 

 below Yakutsk, 1. vii. 1903. This is some eighteen hundred 

 miles up the river from the mouth. The nest was 17" across, 

 with a slight depression for the eggs.] 



4. Larus ridibundus L. 



Larus ridibundus Linnaeus, Syst. Nat. ed. xii. p. 225 (1760 : 

 " Habitat in Mari Europseo"). 



5 S ? ad. 200 miles below Yakutsk, 2, 3. vii. 1903. 

 (Nos. 148, 160, 164.) 



S juv. Lena just below Aldan, 29. vii. 1903. (No. 353.) 



[On July 29, near Yakutsk, I shot a young bird flying 

 which had just left its nest. It was the only bird of this 

 species on the river-beach at the time.] 



