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



and southern Wisconsin. Frequents thick woods in the vicinity of 

 water. Its song is delightful, a complicated warble difficult to de- 

 scribe, but which begins loud, and gradually dies away. 



Mr. Isaac E. Hess informs me he took a nest with five eggs near 

 Philo, Champaign Co., Illinois, on June 9, 1907. Messrs. Kumlien 

 and HoUister record half a dozen specimens taken in Wisconsin during 

 the past 50 years; one in Walworth County, another in Milwaukee 

 County, and the others about Lake Koshkonong. (Birds of Wiscon- 

 sin, 1903, p. 117.) 



The nest is large and is composed of leaves, fine twigs, and grass 

 or moss, hidden in a mossy bank or beneath old logs and roots of dead 

 trees. The eggs are 5 or 6, dull white, speckled and spotted with 

 brown, and measure about .74 x .59 inches. 



Genus OPORORNIS Baird. 



329. Oporornis formosa (Wils.). 



Kentucky Warbler. 



Geothlypis formosa (Wils.), A. O. U. Check List, 1895, p. 282. 

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

 breeds from the Gulf states to southern New England, southern 

 Michigan and Iowa; winters in the West Indies, eastern Mexico, and 

 Central America to Panama. 



Adult male and jem,ale in spring: Crown and sides of head, black, 

 extending in a streak on sides of throat ; a yellow superciliary stripe ; 



upper parts, wings and tail, olive 

 green; under parts, clear bright yellow, 

 shading to olive on sides ; no white on 

 wings or tail. 



Adults in fall and winter: Similar, 

 but, black feathers on the crown edged 

 with grayish olive. 

 Immature in fall: Similar, but the black markings replaced by 

 dusky or entirely absent. 



Length, 5.50; wing, 2.55; tail, 2; bill, .38. 



A common summer resident in southern Illinois, but rare in 

 northern Illinois and southern Wisconsin. 



Mr. Isaac E. Hess informs me he has taken several sets of eggs of 

 this species in Putnam amd Champaign Counties, Illinois. Mr. H. S. 

 Swarth took 4 specimens 'and observed several others of both sexes 

 at Joliet, Illinois, between May 13 and 29, 1907. Dr. Joseph L. Han- 



