196 THE BIEDS OF MONGOLIA ETC. 



a single species of Thrush breeding, although some localities seem to be very 

 suitable for that purpose — as, for instance, the wooded mountain-chains of 

 Muni-ul and Ala-shan. But even during migration only very limited numbers 

 visit Mongolia; and then they fly, avoiding the deserts, only along its 

 eastern more fertile boundary. 



T, naumanni, which is so very common in China, was met with by us 

 once, in a flock of several specimens, at the city of Dolan-nor, in the 

 Hoang-ho valley, and on another occasion at Koko-nor. 



In Ussuri country it is very abundant during migration, but does not 

 breed there, as we have never seen it in summer. At Lake Hanka the 

 Thrush arrives about the middle of March, and proceeds on its migration 

 northwards in the month of April; and in May none are to be seen. In 

 autumn they migrate in October ; and at the coasts of the Japanese sea I 

 noticed single birds throughout November. During migration it always kept 

 in small flocks (ten to thirty individuals). 



106. TuRDUS FuscATUs, Pall. Drost chernosohoy. 



We only once met with a flock of Turdus fuscatus in the Shura-had 

 fnountains of S.E. Mongolia, during migration. At Lake Hanka they migrate 

 during April and the beginning of May, usually in company with the 

 preceding species, and, like them, do not breed there, but go further north 

 for that purpose. 



107. Turdus auritus, J. Verr. 



Turdus auritus f J. Verr. Nouv. Arch, du Museum^ 1873^ t. ix. pi. v. 



Pere David some time since discovered Turdus auritus in China ; it is 

 closely allied to our T. musicus. We met with it only in Kan-su, which 

 appears to be its northern boundary. Here it inhabits the wooded parts of 



