674 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Genus WILSONIA Bonap. 



334. Wilsonia citrina (BODDAERT). 

 HOODED WARBLER. 



Sylvania mitrata (Gmel.) , A. O. U. Check List, 1895, p. 285. 

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

 north to southern Wisconsin, southern Ontario, New York and 

 southern New England; breeds nearly throughout its United States 

 range; winters in the West Indies, Mexico, and Central America to 

 Panama. 



Adult male: A bright yellow mask (gamboge yellow) or hood, 

 including front of crown and sides of head; rest of head and throat, 



black; rest of upper parts, olive green; 

 rest of under parts, gamboge yellow; 

 wings, slaty brown, edged with olive; 

 tail feathers, slaty brown, edged with 

 olive; three outer tail feathers marked 

 with white, the first and second, white 

 on terminal portion of inner webs for at 

 least half their length, the white patch 

 on the third much smaller. 



Male. 



Adult female: No black on throat, 



which is entirely yellow ; black on head often mixed with olive and 

 restricted to a comparatively narrow area bordering the yellow on 

 forehead and sides of head; otherwise resembles the adult male. 



Immature male: Similar to adult male, but black feathers more 

 or less tipped with yellow. 



Immature female: Resembles the adult female, but no black 

 whatever on head; entire upper parts, including top of head, olive 

 green. 



Adults in fall and winter: Apparently little or no variation from 

 summer plumage. 



Length, 5.50; wing, 2.55; tail, 2.40; bill, .38. 



The Hooded Warbler is an abundant summer resident in southern 

 ' Illinois, but occurs casually in northern Illinois and Wisconsin. 

 According to Mr. F. M. Woodruff a specimen was taken by Mr. B. T. 

 Gault at River Forest, Illinois, May n, 1881, and another was killed 

 by a boy with a sling shot in Hyde Park, Chicago, April 28, 1884 

 (Birds of the Chicago Area, 1907, p. 176). 



Mr. Isaac E. Hess informs me he has found it breeding near Philo, 

 Champaign County, Illinois, and took a set of 5 eggs, May 30, 1897. 



