52 University of California Publications in Zoology. [Vol. 7 



Six specimens were secured. Three from Kuiu Island (nos. 

 9820-9822) and one from Calder Bay, Prince of Wales Island 

 (no. 9823), are in fresh, nuptial plumage; while two from Brad- 

 field Canal (no. 9824) and Zarembo Island (no. 9825) are adults 

 in very much worn nuptial plumage, but not yet beginning to 

 molt. 



Pelidna alpina sakhalina (Vieillot). Red-backed Sandpiper. 



First seen at Three-mile Arm, Kuiu Island, on April 28, when 

 two birds were secured from a small flock. Several other flocks 

 were subsequently observed at the same place, and three more 

 specimens were taken on May 3. The only other place where 

 the species was encountered was on the beach at Warren Island, 

 where, on May 20, two individuals remained with a flock of 

 western sandpipers, and spent the whole day on the sandy shore 

 just below my tent. 



The five birds secured (nos. 9834-9838), four males and a 

 female, are in perfect nuptial plumage, and are very richly 

 colored. The feathers of the black abdominal patch are slightly 

 tipped with white, a mark which would doubtless disappear 

 from abrasion in a very short time. 



Ereunetes pusillus (Linnaeus). Semipalmated Sandpiper. 



A single example secured at Thomas Bay on August 19. 

 Numerous individuals of wha>t I supposed at the time to be 

 E. mauri were seen scattered through the flocks of least sand- 

 pipers that swarmed over the mud flats at this point, but this, 

 the only one I shot, is undoubtedly E. pusillus. Possibly most, or 

 all, of the other birds observed belonged to the same species. 



This bird (no. 9833) is an immature female in first winter 

 plumage, and is indistinguishable from comparable specimens 

 of E. pusillus in the Grinnell collection, from the Atlantic coast 

 and northern Alaska. E. mauri in corresponding plumage pre- 

 sents obvious color differences, besides the great discrepancy in 

 the length of the bill. This constitutes the first known record 

 of E. pusillus on the coast of southeastern Alaska. 



