1911] Swarth: Alaska Expedition of 1909. 55 



Squatarola squatarola (Linnaeus). Black-bellied Plover. 



A small flock was seen by Hasselborg on the mud flats at 

 Three-mile Arm, Kuiu Island, on May 3, but none were secured. 

 The species was not met with again until September, when 

 small flocks and scattered individuals were noted on the flooded 

 meadow land along the Taku River. Two secured on September 

 26 (nos. 9880, 9881) are in freshly acquired winter plumage. 



Aegialitis semipalmata (Bonaparte). Semipalmated Plover. 



One of a pair was secured on Coronation Island, May 15, 

 and on the following day a small flock was observed at the same 

 place. Several were seen on the beach at Warren Island on 

 May 20. The species was not met with again until the beginning 

 of the fall migration. At Zarembo Island, July 27 to August 

 1, it was abundant on the mud flats, in small companies of 

 from two to six individuals together with much larger gatherings 

 of least sandpipers, and at Thomas Bay it was very numerous, 

 and in the same association. Three specimens were preserved, 

 two from Coronation Island (nos. 9877, 9878) and one from 

 Zarembo Island (no. 9879), all adults in summer plumage. 



Aphriza virgata (Gmelin). Surf -bird. 



Seen only at Three-mile Arm, Kuiu Island. At this point, 

 from April 25 to May 6, it was abundant and in large flocks, 

 feeding in company with the numerous other waders frequenting 

 the mud flats. 



Of the seven specimens secured here (nos. 9870-9876), six 

 are in nearly perfect nuptial plumage. In one (no. 9874) there 

 are many pin-feathers on the dorsal region and the chestnut 

 marked scapulars of the summer plumage are but beginning 

 to appear. Most of the birds secured have some of the plain 

 colored winter feathers interspersed through the plumage of the 

 breast, but as specimens in the Grinnell collection, taken at Sitka 

 in late summer are in the same condition, it seems as though 

 such old feathers are sometimes carried through to the post- 

 nuptial molt. 



