BIRDS OF NORTH AND MIDDLE AMERICA. 211 



upper tail-coverts, and raidcUe pair of rectrices dusky, the feathers 

 of rump narrowly margined with brownish gray, the lateral upper 

 tail-coverts mostly wliite; other rectrices pale brownish gray, narrowly 

 edged with whitish terminally; wing-coverts brownish gray, darker 

 centrally, narrowly margined at tips with paler gray or whitish, the 

 greater coverts narrowly tipped with white; primary coverts and 

 remiges dusky, the outermost primary with white shaft, the remain- 

 ing primaries Avith shafts at least partly white; a streaked wliite 

 superciliary stripe and dusky loral space, the latter usually distinctly 

 defined along its upper edge but the lower portion broken into 

 streaks, which extend backward across the suborbital region; auricu- 

 lar region streaked with grayish brown; under parts white, the chest 

 and breast tinged with gray and streaked with dusky; bill blackish; 

 iris dark brown; legs and feet dusky (in dried skins). 



Winter plumage. — Above brownish gray with dusky shaft-streaks; 

 superciliary stripe and imder parts white, the chest faintly streaked. 



Young. — Similar to summer adults but chest tinged ^dth pale 

 grayish bufiF and without weU-defined streaks or spots, the scapulars 

 and interscapulars margined terminally with white and the brown 

 usually less rusty. 



Dovmy young. — Forehead dull white to pale grayish buff, divided 

 by a median line of black, this not reaching to bill; crown cinnamon- 

 brown, marbled posteriorly with black and white; occiput mottled 

 whitish; a distinct loral line of black, sometimes forking just before 

 the eye, the upper branch running toward anterior angle of eye, the 

 other inclining downward; upper parts mixed black and cinnamon- 

 brown, thickly bespangled with fine buffy white tufts, terminating 

 the down-filaments; under parts immaculate dull white passing into 

 pale brownish buffy anteriorly. 



Adult male.— Wing, 88-98.5 (93.9); tail, 38-44.5 (41.2); exposed 

 culmen, 17-20 (18.6); tarsus, 19-21 (20.5); middle toe, 15-17.5 

 (16.2).° 



Adult female.— ^Ymg, 92-101.5 (96.5); tail, 40-44 (41.5); exposed 

 culmen, 18-22 (20.3); tarsus, 20-22 (20.8); middle toe, 15-17.5 

 (16.5).^' 



North and South America and West Indies; breeding in Arctic 

 districts, from northeastern Labrador and mouth of Yukon River, 

 Alaska, to Arctic coast; migrating chiefly eastward of Rocky Moun- 

 tains; wintering from South Carohna, Texas, etc., southward, through- 

 out West Indies, Central America, and South America, as far as 

 Peru (Paracas Bay) and Patagonia; autumn migrant in Bermudas; 

 casual or occasional in northeastern Siberia, Pribilof Islands, southern 

 Alaska (Thomas Bay), and British Columbia; accidental in Europe. 



« Eleven specimens. & Thirteen specimens. 



