568 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



streak near tip, and the first with outer wel) largely white; chin, 

 throat, and upper chest uniform black, this black area with a convex 

 or truncated posterior outline;^ rest of under parts white, usually 

 faintly shaded laterally with gray and sometimes narrowly and indis- 

 tinctly streaked on sides with dusky; bill blackish; iris brown; legs 

 and feet dark horn brown, sometimes blackish (in dried skins). 



Adult male hi autumn and winter. — Similar to the spring and sum- 

 mer plumage, but yellow of crown and occiput more or less obscured 

 by olive or olive-green tips to feathers, Ijlack streaks on back, etc., 

 more or less concealed by broader grayish margins to feathers, and 

 feathers of black throat-patch more or less tipped or margined with 

 whitish. 



Young male in first autumn and winter. — Above similar to the adult 

 male of corresponding season, but black streaks on back, etc., narrower, 

 more concealed, sometimes obsolete; whole pileum suffused or over- 

 laid with a wash of olive or olive-green, and back more strongly tinged 

 with olive; 3^ellow on sides of head paler, less pure, the auricular region 

 much tinged with olive; chin, throat, and upper chest dull whitish or 

 pale yellowish, the feathers abruptly black or dusky beneath surface; 

 rest of under parts soiled white, the sides and flanks strongly tinged 

 with pale olive-brownish. 



Adult female in spring and summer. — Above similar to the immature 

 male above described, but forehead and crown largely (often mostl}^) 

 yellow, and dusky streaks on back, etc., still narrower, often obsolete; 

 under parts also similar, but body portions less tinged with brownish, 

 the chest often with a dusky patch (its feathers tipped with whitish) 

 extending more or less over throat, sometimes covering whole throat. 



Adult female in autumn and winter. — Above plain grayish olive, 

 the pileum showing more or less of yellow anteriorly and laterall3% all 

 the feathers yellow beneath the surface; the back, etc., unstreaked, or 

 with streaks concealed; beneath brownish white, more strongly tinged 

 with brownish laterally, the feathers of throat and upper chest dusky 

 beneath the surface, showing wherever the feathers are disturbed. 



Young m female in first autumn and winter. — Similar to the adult 

 female of corresponding season, but more decidedly olive or olive- 

 brownish above, and throat more yellowish. 



Adult niale.—\j^vigi\i (skins), 112-122 (118); wing 63-69 (6(>.l); tail, 

 49-52 (50.5); exposed culmen, 9.5-11 (10.1); tarsus, 18-21 (19.4); 

 middle toe, 11-12 (11.3)." 



Adult female.— Ij^n^ih (skins), 111-120(111.5); wing, 62-63 (62.3); 

 tail, 46.5-51 (48.3); exposed culmen, 9-10 (9.7); tarsus, 16.5-20 (18.3); 

 middle toe, 10-12.5 (11.3).' 



^Not extending farther backward laterally than medially, as in I), toimsendi, D. 

 virens, D. chrysopcma, and D. nigrescens. 

 * Seven specimens. ^ Four specimens. 



