688 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



the terminal portion dusk}^ or blackish; iris brown; legs and feet 

 black. 



Adults, dusky phase (sexes alike). — Entirely plain dark soot}" 

 grayish brown, the neck more or less tinged with straw yellow. 



Young, light-colored phase. — Head and neck streaked with dusky 

 brown and cinnamon or cinnamon-buff, the latter usually predom- 

 inating; under parts more or less distinctly baired or transversely 

 spotted with the same; upper parts dusky grayish brown, the feathers 

 tipped or terminally margined with cinnamon or cinnamon-buff. 



Young, dusky phase. — ^General color dusky grayish brown or brown- 

 ish gray, the wings and tail darker; middle of neck, all round, indis- 

 tinctly streaked with grayish white; under parts, except chest and 

 upper breast, barred with grayish white, the bars broad and distinct 

 on under tail-coverts; scapulars, interscapulars, wing-coverts, upper 

 tail-coverts, and feathers of rump narrowly tipped or terminally mar- 

 gined with pale dull buff. 



Downy young.— ^" Sooty brown above, paler below; but the downy 

 young of dark parents are deepest in hue."'* 



Adult male.— Wing, 301-340 (320); tail, 164.5-235 (188.9);'' ex- 

 posed culmen, 28-35 (31.2); tarsus, 39.5-45.5 (41.9); middle toe, 

 33-37 (34.8).'^ 



Adult fymale.—Wmg, 317-341 (323.7); tail, 176-226 (199.7); 

 exposed culmen, 29-34.5 (31.8); tarsus, 39-45 (42.1); middle toe, 

 32-38 (35.9).*^ 



a Saunders, Cat. Biiis Brit. Mus., xxv, 1896, 332. 

 ^ Measured to tips of elongated middle rec trices. 

 '^ Sixteen specimens. 

 ^ Fourteen specimens. 



Locality. 



Middle 

 t.oe. 



MALES. 



One adult male from northern Russia (Archangel). . 



One adult male from Iceland 



One adult male from Greenland 



Four adult males from Massachusetts (September).. 



Six adult males from Alaska 



Three adults males from Bering Island, Kamchatka 



FEMALES. 



One adult female from Spitzbergen 



One adult female from Faroes 



One adult female from Greenland 



Two adult females from Massachusetts (September) 



Eight adult females from Alaska 



One adult female from Bering Island, Kamchatka. . 



35. 5 

 36 

 35 

 36. .-) 

 35. S 

 34.5 



