J96 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



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

 45-51 (48.4); exposed culmen, 9-11 (10); tarsus, 18-20 (19.1); middle 

 toe, 10.5-12 (11. 5). 1 



Adult male in autumn and tmnter.^ — Very different from the summer 

 plumage. Above dull olive-green, passing gradually into dull graj' 

 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 usuallj' 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 first autumn and winter.^ — 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 usually less distinctly streaked. 



Young ^ first phimage. — 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: 



^ This species in winter plumage closely resembles inmature specimens bl D- ^ 

 castanea, but may at once be distinguished by the pure white, instead of buff, onder • 

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

 differences. 



