Jan., 1909. Birds of Illinois and Wisconsin — Cory. 



653 



records for Delavan, Milwaukee, Racine, Two Rivers, etc. Mr. 

 Clark has not found it in Dunn County. Dr. Hoy considered it as 

 a breeding species, which is very probably true. There is one record 

 for Lake Koshkonong, June 14 (1872)." (Birds of Wisconsin, 1903, 



Breeds in May and June. The nest is built in a tree, usually from 

 30 to 50 feet from the ground, and is composed of grass, shreds of 

 bark, plant fiber, and spiders' webs. The eggs are 3 or 4, cream white 

 or pale greenish white, marked and spotted with brown, and measure 

 about .63 X .51 inches. 



316. Dendroica pensylvanica (Linn.). 

 Chestnut-sided W^arbler. 



Distr.: Eastern North America south of northern Quebec, north- 

 ern Ontario, and Manitoba, and west to Montana, the Dakotas, and 

 Kansas; breeds from southern Indiana and Illinois and in the Ap- 

 palachian highlands from South Carolina northward ; south in winter 

 in Mexico and Central America to Panama. 



Adult male: Crown, yellow; a black stripe over the eye and a 

 black patch in front of and below the eye; sides of head about ear 



coverts, white; back streaked with black 

 and greenish yellow ; wing coverts tipped 

 with whitish yellow, forming pale yellow- 

 ish wing bars; sides of breast, chestnut; 

 under parts, white. 



Adult female: Similar, but duller and 

 the black on the face more restricted 

 and sometimes only slightly indicated. 

 Immature: Upper parts, clear yellow- 

 ish olive; under parts, white; sides of head and body, ashy; wing 

 bars as in the adult. 



Diagnostic characters in any plumage: Wing bars, yellowish; 

 throat and belly, white. 



Length, 5; wdng, 2.45; tail, 1.95; bill, .37. 



The Chestnut-sided Warbler is an abundant migrant throughout 

 Illinois in spring and fall and is claimed to be a more or less common 

 summer resident in northern Illinois and Wisconsin. Its note is a 

 faint, soft tseep and the song resembles wee-see, wee-see, wee-see re- 

 peated quickly, and on an ascending scale. 



Mr. Robert Kennicott (Trans. 111. Agri. Soc, Vol. I, 1853, p. 583) 

 states that it was knowm to breed in Cook Co., Illinois. Mr. E. W. 



