528 NORTH AMERICAN BIRDS. 



and sometimes entirely wanting, the whole top of the head being 

 uniform olive-green. Young in first autumn similar to adult fe- 

 males, without black on crown.) 

 d l . Duller colored, with shorter wing and tail, and broader as well as 

 darker-colored bill; length 4.25-5.10, wing (male) 2.15-2.35 

 (2.20), tail 2.05-2.25 (2.11). Nest embedded in ground, in 

 swampy woods, somewhat like that of Helmitherus vermivorus 

 or Mniotilta varia. Eggs 4-5, .60 X -48, white or creamy white, 

 speckled with reddish brown and pale lavender or lilac-gray. 

 Eab. Eastern and northern North America, west to and in- 

 cluding Rocky Mountains, and to coast of Bering's Sea ; breed- 

 ing from northern border of United States (and higher Eocky 

 Mountains?) northward; in winter, south through eastern 

 Mexico and Central America to Panama. 



685. S. pusilla (Wils.). Wilson's Warbler. 

 d 2 . Brighter colored (the back bright yellowish olive-green, lower 

 parts rich gamboge-yellow, the forehead, in adult males, often 

 tinged with orange), with longer wing and tail, and narrower 

 as well as paler-colored bill ; length 4.25-5.10, wing (male) 

 2.15-2.30 (2.21), tail 2.00-2.20 (2.10). Eggs .61 X -47. Sab. 

 Western North America (chiefly along or near Pacific coast, 

 north to Kadiak, Alaska) ; south, in winter, through western 

 Mexico to Costa Eica. 



685a. S. pusilla pileolata (Pall.). Pileolated Warbler. 

 b 2 . Upper parts plumbeous-gray (tinged with olive in young and autumnal 

 specimens). 



Adult male : Forehead spotted with black ; a yellow supraloral bar 

 and an orbital ring of the same color; lores black; lower parts 

 yellow, fading into white on under tail-coverts, the chest crossed 

 by a series of black spots. Adult female: Similar to male, but 

 without black spots on forehead, and those across chest much less 

 distinct, and often olive-grayish or dusky instead of black ; yellow 

 orbital ring and streak above lores less distinct. Young in fall : 

 Similar to the duller-colored adult females. Length 5.00-5.75, 

 wing 2.50-2.65, tail 2.20-2.40. West in clumps of weeds or tussocks 

 of grass in swampy woods. Eggs 3-5, .68 X -51, colored like those 

 of 8. mitrata. Sab. Eastern North America, north to Newfound- 

 land, southern Labrador, and Lake Winnipeg; south, in winter,, 

 through eastern Mexico and Central America to Ecuador. 



686. S. canadensis (Linn.). Canadian Warbler. 



