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386 bulletin: museum of compakative zoology. 



Arquatella maritima couesi Ridgway. 



ALEUTIAN SANDPIPER. 



A few were noted at Providence Bay, Siberia and at the south- 

 east end of St. Lawrence Island during June 1913, and at East Cape- 

 during the middle of July of the same year. Specimens were taken 

 at these localities. 



Pelidna alpina pacifica Coues. 



AMERICAN RED-BACKED SANDPIPER. 



As stated by Thayer and Bangs, (Birds of the Arctic coast of East 

 Siberia. Proc. N. E. Zool. Club, 1914, 5, p. 17), there appears to be 

 three distinct races of the Dunlin, the western European bird being 

 the smallest; the North American form the largest; and the East 

 Siberian bird intermediate. 



Mr. Bangs and I carefully studied our series from Alaska and 

 eastern Siberia comparing them with many Dunlin's taken from 

 localities throughout its range. Our results confirmed the above 

 statement. The size of the bill is a more constant character than 

 coloration. 



Red-backed Sandpipers though common at Point Barrow, where I 

 saw them in abundance about the 20th of August, must be very rare 

 east of Point Barrow, for we only noted one, a female taken at Collin- 

 son Point, August 3, 1913. 



Several were taken on August 30, 1914, at Wainwright Inlet by 

 Mr. Dixon. 



Pelidna alpina sakhalina (Vieillot). 



EAST SIBERIAN DUNLIN. 



We found this species rare at Providence Bay during June 1913,. 

 but quite common on low tundra near East Cape, and Cape Serdze- 

 during the middle of July 1913. Specimens were secured at these 

 localities. Dunlins observed at St. Lawrence Island during the latter 

 part of June 1913, were not taken. 



