38 BIRDS AND MAMMALS OF EAST SIBERIA [^'voLV*^' 



does, for that of any other bird. The birds were always in the 

 alders, and when they stopped singing at his approach, they could 

 not be found. 



Cyanosylvia suecica robusta (Buturlin). 



One bird and one set of six eggs were secured at Nijni Kolymsk. 



The first arrival noted was on May 31, 1912, at Nijni Kolymsk. 

 A nest containing six fresh eggs was found on June 14. It was on a 

 grass-grown turf in a clearing close to the village; the nest was well 

 hidden among " heathberry " plants and grasses. 



The Siberian red-spotted bluethroat was a rather uncommon 

 bird, in Mr. Koren's experience, in the Kolyma region. 



Oenanthe oenanthe oenanthe (Linn.). 



Four specimens, adults, and young in autumn plumage, were 

 taken at Nijni Kolymsk, May 30, 1912, and at Amqujara River, 

 Aug. 27, 1911. 



The wheatear was nowhere common, but was widely distributed 

 along the Arctic coast of Siberia. It arrived at Nijni Kolymsk, 

 on May 31, 1912, and was observed at the same place as late as 

 September 21, 1911. 



At Cape Bolshaja Baranov, on July 6, 1912, a nest was found, 

 containing young about a week old. It was in a little crevice of a 

 steep cliff on the coast. 



We can detect no differences in size or color between Siberian 

 and European specimens, but, as Ridgway has already pointed out, 

 in ' Birds of North and Middle America,' Alaskan birds are consid- 

 erably larger. In fact Alaskan specimens are about midway in 

 size between 0. oenanthe oenanthe (Linn.) and 0. oenanthe leucorhoa 

 (Gmel.). Even young birds in autumn from Alaska can be told 

 by their measurements, and could certainly, we think, be identified 

 on migration, wherever they might be taken. 



