280 



KEY TO THK BIRDS OF EASTERN NORTH AMERICA. 



Crowu, dull olive; throat, bright yellow; belly, much paler, often whitish; 

 tail, brownish olive, without yi'llow: wing, not longer than tail ; males havs 

 black patch on face (forehead and sides ot head) which is lacking in females. 



Maryland Yellowthroat. 



Geothhjpis trichas. 

 See Xo. 522. 



Throat and belly, nearly the same color: crown, glossy black (male), or olive 



green like back (female) ; tail feathers, slaty brown 



faintly washed with olive on outer webs; numerous 



small black bristles at base of bill. 

 ^ Wilson's Warbler. 



Wilson's Blackcap. 



Sylvania pusilla. 

 See No. 526. 



Entire underparts, yellow: brightest on the belly; wing, longer than tail; 



crown, o-rayish; back and rump, dull olive; tail feathers, not marked with 



' ' Mourning Warbler. 



Geothlypis Philadelphia {young female). 

 See No. 521. 



Part 5. The following species have the throat, yellow ; belly, not yel- 

 low ; tail feathers, marked with more or less white : — 



Back, black or dark; tail, black, with broad 

 band of white; rump, yellow. 



Black and Yellow Warbler. 



Dendroica maculosa. 

 See No. 500. 



Back, slaty blue, often showing yellowish olive; rump, slate color; sides of 



head, grayish or slaty blue. 



Parula Warbler. 



Blue, Yellowbacked Warbler. 



Corapsothlypis america na . 

 See No. 494. 



Back, (lull gri'cii; tliroat, faintly wash<;d with greenish yellow: rump, green; 



sides, not streaked. 



Tennessee Warbler. 



Helminthophila peregrina. 



See No. 493. 



Hack, greenish; rump, greenish; cheeks, yellowish; sides, showing more or 



less dark streaks. 



Black-throated Green Warbler. 



, Dendroica virens. 



