JAN., 1909. BIRDS OF ILLINOIS AND WISCONSIN CORY. 663 



streaked with pale chestnut brown; sides and flanks usually with 

 obscure streaks of the same; no noticeable wing bands; inner webs 

 of two outer tail feathers with nearly square cut white spaces at tips. 



The sexes are similar. 



Immature: Similar to adult, but much more brownish olive above; 

 the markings less distinct, and less yellow on the under parts. 



Diagnostic characters in any plumage: Shape of white tail spots 

 on two outer feathers (see cut), combined with pale brownish wing 

 bars (never white), formed by the tips of the wing coverts. 



Length, 5.10; wing, 2.55; tail, 2; bill, .38. 



The Palm Warbler is an abundant migrant in spring and fall in 

 Illinois and Wisconsin. Its song is a sweet trill. 



325. Dendroica discolor (VIEILL.). 

 PRAIRIE WARBLER. 



Distr.: Eastern United States, west to Kansas and Nebraska, 

 breeding from Florida to southern New England and Michigan; 

 winters in Florida and the West Indies. 



Adult male: Upper plumage, bright olive green, the back marked 

 and spotted with chestnut; a yellow line over the eye and a yellow spot 



Prairie Warbler. 



under the eye, bordered below on side of throat by a short black 

 stripe; throat and under parts, bright yellow, streaked with black 

 on sides of breast and body; wing coverts tipped with yellow, form- 

 ing pale yellow wing bars; three outer tail feathers with white patch 

 on inner webs; outer web of outer tail feather, white, except near 

 the tip. 



Adult female: Similar, but somewhat paler and with but little 

 or no chestnut on the back. 



