386 BULLETIN: MUSEUM OF COMPARATIVE 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. Zodl. 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). 
Be. 
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. 
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