TURDINiE. 55 



The Siberian Black-bellied Dipper is a common resident on the 

 mountain-streams of all the Japanese islands (Blakiston and Pryer, 

 IbiSj 1878; p. 239) . There are two examples in the S winhoe collection 

 from Hakodadi (S winhoe, Ibis, 1875, p. 449), and there are five 

 examples in the Pryer collection from Yokohama. I have also an 

 example from Nagasaki. 



The range of the Siberian Black-bellied Dipper extends northwards 

 to Kamtschatka and the Aleutian Islands, westwards to Lake Baikal, 

 and southwards to Central China. 



18. ACCENTOR ALPINUS. 

 (ALPINE ACCENTOR.) 



Motacilla alpina, Gmelin, Syst. Nat. i. p. 804 (1788). 



The Japanese race of the Alpine Accentor has the throat white 

 spotted with black; and the upper tail-coverts are chestnut with 

 dark centres. 



Figures: Swinhoe, Proc. Zool. Soc. 1870, pi. 9; Gould, Birds of 

 Asia, iv. pi. 43. 



The Japanese Alpine Accentor is not known to occur in Yczzo, but 

 there are two examples in the Pryer collection from Fuji-yama. 



Dybowski procured it on a mountain near the southern shore of 

 Lake Baikal ; Maack obtained it in the valley of the Araoor ; Midden- 

 dorff found it on the southern shore of the Sea of Okhotsk ; and 

 Swinhoe described it from North China. I have examples collected 

 by Prjevalski in Kansu, which are slightly chestnut on the upper 

 tail-coA^erts and much streaked on the flanks, but in this respect they 

 are intermediate between A. alpinus and A. erythropygius. The 

 Japanese Alpine Accentor has been described as a distinct species 

 under the latter name (Swinhoe, Proc. Zool. Soc. 1870, p. 124), but 

 can scarcely be regarded as more than subspccifically distinct, in which 

 case it may be known as Accentor alpinus erythropygius. 



The Alpine Accentors appear completely to intergrade. Typical 

 forms differ as follows : — 



(ru 

 Flanks uniform chestnut.-? 



a/pinus . 

 rufilatus 



;:} 



Upper tail-coverts grey. 



Ipalensis . . "i tt i. -i i. t, j. 



f Dppcrtail-covcrts chest- 

 fry Mro;j?/yzM« .} 



nut. 



