142 BULLETIN 130, UNITED STATES NATIONAL MUSEUM 



than elsewhere. We therefore came to the conclusion that these char- 

 acters represent merely individual variation and should not be re- 

 garded as establishing a subspecies. 



DISTRIBUTION 



Breeding range. — Northern North America. East to the Labrador 

 coast (Hamilton Inlet and Nain), occasionally in Newfoundland 

 (Gaff Topsail). South to the north shore of the Gulf of St. Law- 

 rence, southern Manitoba (Shoal Lake), central North Dakota 

 (Devils and Stump Lakes), and northeastern Washington (east of 

 the Cascade Mountains). West to northwestern British Columbia 

 (Stikine River) and sparingly to northwestern Alaska (Kotzebue 

 Sound). Seen in summer and perhaps breeding in the Aleutian 

 Islands as far west as Tanaga Island. North to the barren grounds 

 of northern Alaska and Canada. 



'Winter range. — Mainly on the seacoasts. On the Atlantic coast 

 from the Gulf of St. Lawrence southward to South Carolina and 

 rarely to Florida. On the Pacific coast from the Commander, 

 Pribilof, and Aleutian Islands southward to Lower California (San 

 Quintin Bay). In the interior on the Great Lakes and irregularly 

 or casually as far west and south as southern British Columbia 

 (Okanogan Lake), Colorado (9 records), and Louisiana. 



S'pring migration. — Northward along the Atlantic coast to Labra- 

 dor and northwestward from the coast to the interior; also north- 

 ward in the interior and along the Pacific coast. Early dates of 

 arrival : Ontario, Toronto, April 13 ; Ohio, Lorain, April 27 • Ken- 

 tucky, Bowling Green, April 6; Minnesota, April 5; Manitoba, 

 Aweme, April 15; Alberta, Alix, May 10; Mackenzie, Fort Simpson, 

 May 18. Late dates of departure : Connecticut, May 15 ; Massachu- 

 setts, May 25 ; Ontario, Ottawa, May 4, and Toronto, May 26 ; Penn- 

 sylvania, Pittsburgh, May 13; Ohio, Lorain, May 3. The main 

 flight up the Pacific coast and across British Columbia to the inte- 

 rior is in May. 



Fall migration. — Apparently a reversal of spring routes. Early 

 dates of arrival : Massachusetts, September 6 ; Maryland, Baltimore, 

 September 12; Ontario, Beamsville, October 8; Minnesota, Heron 

 Lake, October 11; Colorado, Loveland, October 11; Idaho, Coeur 

 d'Alene, October 22; Utah, Bear River, October 8. Late dates of 

 departure : Mackenzie, Nahanni River, October 14 ; Ontario, Beams- 

 ville, November 26 ; Idaho, Coeur d'Alene, December 1. 



Egg dates. — North Dakota: Thirteen records, June 18 to August 

 10 ; seven records, June 29 to July 19. Arctic Canada : Nine records, 

 June 14 to July 10. Alberta, Saskatchewan, and Manitoba: Seven 

 records, June 21 to July 6. 



