338 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



axillars and under wing-coverts* white, the former narrowly barred 

 with brownish gray, the latter barred with darker gray or dusky or 

 with irregular V-shaped marks of tlie same; inner webs of primaries 

 brownish gray, the proximal portion indistinctly edged with pale 

 gray or grayish white, or minutely freckled with the same; bill black, 

 the basal portion of mandible more brownish; iris dark brown; legs 

 and feet yellow. 



Winter plumage. — Upper parts gray, sometimes nearly uniform 

 but usually shghtly broken, especially on scapulars and wing-coverts, 

 with transverse spots of dusky and wliitish edging or dots along edges 

 of the feathers: head, neck, and chest nearly uniform Mght gray, 

 the chin, throat, and supraloral stripe white; otherwise as in summer. 



Young. — Similar to the winter plumage, but the paler markings 

 on upper parts more or less tinged with dull ochraceous or pale brown 

 or dull clay color. 



Adult male.— ^Ying, 149-163 (153.5); tail, 61-67 (62.8); exposed 

 culmen, 35-38 (36.4); tarsus, 45.5-55.5 (50); middle toe, 27-32 (28.8).« 



Adult female.— Wing, 149.5-157 (155.8); tail, 55-66 (63.2); ex- 

 posed culmen, 30-39 (35.5); tarsus, 46.5-52 (50.3); middle toe, 28-30 

 (28.9).^ 



Breeding from northern Quebec and southern Saskatchewan (for- 

 merly southward to Ontario County, New York, Cook County, Illi- 

 nois, and Heron Lake, Minnesota?) to southern Ungava, central 

 Keewatin, northern Mackenzie, and northwestern Alaska (Kotzebue 

 Sound and Kowak River); migrating southward over the whole of 

 United States (much less plentifully west of Rocky Mountains), 

 Middle America (including West Indies and Bermudas) and South 

 America to Ciiile (Santiago; Sacaya, Tarapaca; Huasco; Caracosa) 

 and Patagonia (Chupat VaUey; Rio Sengel; Gregory Bay, Straits of 

 Magellan); wintering northward, at least occasionally^, to Bahamas, 



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