288 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
Crown, olive green (sometimes with forehead 
yellow); underparts, greenish yellow; back and 
rump, olive green; terminal third of inner webs 
of outer tail feathers, white. 
Blue=winged Warbler. 
Helminthophila pinus (female and immature). 
See No. 487. 
Underparts, tinged with greenish yellow; undertail coverts, white; crown, back, 
and rump, olive green ; outer tail feathers very narrowly edged with white 
(entirely absent in some specimens). 
Tennessee Warbler. 
Helminthophila peregrina (female in fall and immature). 
See No. 493. 
Underparts, yellow, washed with olive on sides; sides of head and lores, 
yellow ; crown, olive green; back and rump, olive green; undertail coverts, 
pale yellow. 
Hooded Warbler. 
Sylvania mitrata (female and immature in fall). 
See No. 525. 
Kirtland’s Warbier. 
Underparts, yellow; sides, streaked with black; crown, slaty gray ; back and 
rump, ashy, streaked with black; lores, black. 
Kirtland’s Warbler. 
Dendroica kirtlandii. 
See No. 510. 
