236 Field Museum of Natural History — Zoology, Vol. IX. 



Crown, dull olive; throat, bright yellow; belly, much paler, often 

 whitish; tail, brownish olive, without yellow; wing, not longer than 

 tail; males have black patch on face (forehead and sides of head) 

 which is lacking in females. Geothlypis trichas. 



Maryland Yellow-throat. 

 See No. 332. 



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. Wilsonia pusilla. 



Wilson's Warbler. Wilson's Blackcap. 

 See No. 335. 



Entire under parts, yellow; brightest on the belly; wing, longer 

 than tail; crown, grayish; back and rump, dull olive; tail feathers, 

 not marked with yellow. Oporornis Philadelphia {young female) . 



Mourning Warbler. 



See No. 331. 



PART 5- The following species have the throat, yellowy belly, not 

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



Back, black or dark; tail, black, 



with broad band of white; rump, 



yellow. Dendroica magnolia. 



Magnolia Warbler. 



See No. 314. 



Tail of Magnolia Warbler. 



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

 sides of head, grayish or slaty blue. 



Compsothlypis americana, and races. 

 Parula Warbler. Blue Yellow-backed Warbler. 



See No. 309. 



Back, dull green; throat, faintly washed with greenish yellow; 

 rump, green; sides, not streaked. Vermivora peregrina. 



Tennessee Warbler. 



See No. 308. 



