412 WOOD WARBLERS 



Distribution. From southern Arizona to western Texas and south to 

 northwestern Mexico ; in winter to Guatemala and Nicaragua. 



65 2b. D. a. rubiginosa (Pall). ALASKAN YELLOW WARBLER. 



Like cestiva, but slightly smaller and much duller ; adult male with 

 upper parts darker, duller olive green, crown like back or only slightly 

 yellower on forehead ; adult female duller olive green above, duller yellow 

 below. Male: length (skins) 4.02-4.45, wing 2.40-2.48, tail 1.57-1.81, bill 

 .39. Female : length (skins) 3.90-4.33, wing 2.24-2.44, tail 1.61-1.73, bill .39. 



Distribution. Alaska, south to Vancouver, migrating southward. 



654. Dendroica cserulescens (GmeL). BLACK-THROATED BLUE 



WARBLER. 



Adult male in spring and summer. Face, throat, sides, and flanks black, 

 sides and flanks streaked with white ; rest of under parts white ; 

 upper parts grayish blue ; wing with conspicuous white patch at 

 base of primaries. Adult female in spring and summer: upper 

 parts olive, usually with white spot at base of primaries ; tail 

 feathers edged with bluish or greenish gray ; inner web of 

 Fig. 521. outside feather sometimes with paler or whitish spot ; eyelids 

 with whitish streaks, that of upper lid extending over ear coverts ; under 

 parts pale olive yellowish, shaded with olive laterally. Adult male in fall 

 and winter : like spring male, but white of flanks faintly tinged with brown- 

 ish buff and bill brownish instead of black. Adult female in fall and winter : 

 like summer female, but upper parts greener ; under parts yellower. 

 Young male in first fall and winter : like adult winter male, but white of 

 under parts more or less tinged with yellowish, bluish gray of upper parts 

 tinged with olive green ; black feathers of throat edged with whitish. 

 Young male, first plumage : wings and tail as in fall males ; white spot at base 

 of primaries fully developed ; lores black ; rest of upper parts dark olive 

 brown ; throat and superciliary buff y ; breast and sides ashy ; belly sul- 

 phur yellow. Young female, Jirst plumage : wings and tail like winter fe- 

 male ; spot at base of primaries soiled white ; rest of upper parts light olive 

 brown ; lores dull black ; under parts buff y, olive buff on breast and sides. 

 Male: length (skins) 4.33-4.72, wing 2.44-2.64, tail 1.93-2.13, bill .33-.39. 

 Female : length (skins) 4.33-4.76, wing 2.36-2.48, tail 1.87-2.01, bill .35-.37. 

 Distribution. Breeds in Transition and Canadian zones from Hudson 

 Bay to the northeastern United States, south to Pennsylvania in the 

 mountains ; migrates casually to base of Rocky Mountains ; winters in 

 Guatemala, the West Indies, and northern South America ; accidental in 

 Colorado and on the Farallone Islands. 



Nest. In bushes, compact and deep ; made of fine grass, spider's web, 

 lichen, and strips of fine bark. Eggs : usually 4, buffy whitish or greenish 

 white, more or less heavily spotted with reddish brown. 

 Food. Insects. 



655. Dendroica coronata (Linn.). YELLOW-RUMPED WARBLER. 



Adult male in spring and summer. Crown patch and rump bright yellow ; 

 rest of upper parts bluish gray, streaked with black ; wings 

 , with two white bars ; tail black with gray edgings ; outer pair 

 of tail feathers with large spots of white ; throat white ; rest of 

 under parts black, yellow, and white. Adult female in spring 

 and summer: similar, but smaller and duller; upper parts 

 tinged with brown ; color patches restricted. Adult male in fall 

 Fig. 522. and winter : upper parts grayish brown, streaked with black 



