.96 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



and breast; Jeno-th (skins), 115-127 (120.1); wing. 69-75 (71.5); tail, 

 45-51 (48.1:); exposed eulmen, 9-11 (10); tarsus, 18-20 (19.1); middle 

 toe, 10.5-12 (11.5).^ 



Adult mal)' in (iKfuinn and intnter.'^ — Very different from the summer 

 plumage. Above dull olive-green, passing gradually into dull gray 

 on upper tail-coverts; back and scapulars (sometimes also pileum, 

 rump, or upper tail-coverts) narrowly streaked with black; wings and 

 tail as in summer plumage, but white wing-bands usually tinged with 

 yellow; a narrow and indistinct superciliary streak of pale olive- 

 yellowish, the upper eyelid whitish; auricular region and sides of neck 

 olive or dull olive-greenish, like general color of upper parts; malar 

 region, chin, throat, chest, breast, and sides pale olive-yellow or straw 

 yellow, the sides and flanks indistinctly streaked with dusky; abdomen, 

 anal region, and under tail-coverts white. 



Young in fir i<t autumn and lolnter.^ — Similar to the adult male at 

 same seasons, but under parts more extensively yellowish (only the 

 under tail-coverts white), upper tail-coverts dull olive-greenish, like 

 back, etc., instead of grayish, and back usuallv less distinctly streaked. 



Young ^ first plumage. — Pileum, back, and scapulars light grayish 

 brown streaked with black, the streaks more or less wedge-shaped, 

 especially on back; rump very pale grayish brown or light buffy gray, 

 transversely mottled or barred with black; upper tail-coverts grayish 

 brown with indistinct paler tips and dusky shaft-streaks; under parts 

 whitish, tinged with olive-yellow anteriorly, everywhere, except on 

 under tail-coverts and lower abdomen, transversely mottled with dusky; 

 wings and tail as in winter plumage. 



Eastern and northern North America, north to the limit of tree- 

 growth; breeding from Ungava (Fort Chimo) and shores of Hudson 



^ Seventeen specimens. 



Western specimens average larger than eastern, measurements being as follows: 



Localitv. 



Middle 

 toe. 



MALES. 



Eleven adult males from Atlantic coast district 



Four adult males from Mississippi Valley 



Four ad>ilt males from Rocky Mountains 



Six adult males from Alaska 



FEMALES. 



Nine adult females from Atlantic coast district. 



Five adult females from Mississippi Valley 



Three adult females from Alaska 



11.8 

 12.;! 

 12. 

 12. 



11.2 

 ll.C) 

 11.6 



^ This species in winter i)lumage closely resembles inmature specimens of J). 

 (■((^laiien, but may at once be distinguished l)y the pure white, instead of buff, under 

 tail-coverts, and pale yellowish brown, instead of dusky, feet, independent of other 

 differences. 



