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



Adult male: Crown with partially concealed patch of orange 

 brown; a rather obscure yellowish orbital ring; rest of upper parts, 

 dull grayish olive, shading to olive green on the rump ; under parts, 

 yellowish olive, showing very faint and obscure dusky streaks on the 

 breast; wings and tail, fuscous brown, the former narrowly edged 

 with olive and the latter apparently plain, but the outer feathers 

 with very narrow whitish edgings. 



Adult female: Similar, but crown patch less extended. 



Young birds lack the orange brown crown patch, and the orbi- 

 tal ring is whitish. 



Length, 4.90; wing, 2.40; tail, 1.90; bill, .38. 



The Orange-crowned Warbler is common in Illinois and Wiscon- 

 sin during the migrations in spring and fall. Specimens have been 

 taken in Wisconsin in June and July, and Messrs. Kumlien and Hollis- 

 ter are of the opinion that it breeds, but there is no record of the nest 

 and eggs having been taken in the state. 



308. Vermivora peregrina (WiLS.). 



Tennessee Warbler. 



Helminthophila peregrina (Wils.), A. O. U. Check List, 1895, 

 p. 272. 



Distr.: Eastern North America, west to the Rocky Mountains; 

 breeds from northern New York, northern New England, Manitoba, 

 and the mountains of Colorado north to Ungava and the Mackenzie 

 region; winters in Mexico. Central America, and northern South 

 America. 



Adult male: Upper parts, clear olive green, brightest on the rump ; 



crown, ash-gray; eye ring and lores, and occasionally more or less 



_ of a superciliary stripe, whitish; under 



parts, white (sometimes faintly tinged 



with pale yellow in places) ; flanks 



tinged with olive; wings, dark fuscous 



brown, the feathers edged with the color 



of the back; inner secondaries, narrowly 



edged with whitish on inner webs; tail, 



fuscous, the inner web of the outer tail 



feather generally with white edge near tip . 



Adult fern-ale: Similar, but under parts tinged with pale greenish 



yellow. 



Immature: Upper parts, including crown, yellowish olive; under 

 parts, greenish yellow, shading to whitish on belly and crissum. 



