1056 Eepoet of State Geologist. 



twigs and about the blossoms, they are like Vireos, examining both 

 sides of every leai, and the inside as well as the outside of every 

 blossom; on the large limbs, they may be often mistaken for the Black 

 and White Warbler, such adepts are they as creepers. Having all 

 these traits, they are excellent general-purpose birds, as insect- 

 catchers. 



*270. (659). Dendroica pennsylvanica (Linn.). 



Chestnut-sided Warbler. 



Head of Chestnut-sided Warbler. Natural size. 



Adult Male. — Upper parts, greenish-yellow, streaked with blackj 

 crown, yellow, bordered with white, then enclosed in black; sides of 

 head and under parts, pure white; lores, with a line through the eye 

 and one below it, black; a conspicuous chestnut-brown stripe on the 

 sides, starting in a line with the black mustache; wing and tail 

 feathers, dark brown, edged with bluish-gray; wing bars, white, gen- 

 erally fused in one large patch. Female. — Similar, but less highly 

 colored; black on head obscure, and chestnut streaks thinner and 

 fewer (Nehrling, Pt. Y., p. 215). Immature. — Different; above, con- 

 tinuous light olive-green; below, white; ring around eye, white; no 

 black on head; sometimes a chestnut streak on the side; wing bars, 

 clear yellow. The clear, yellow wing bars and white under parts dis- 

 tinguish birds in this plumage. 



Length, 4.60-5.25; wing, 2.40-2.65; tail, 1.95-2.10. 



Range. — Eastern North America, from Panama to Manitoba, On- 

 tario and Xewfoundland. Breeds from northern iS'ew Jersey, Illinois 

 and the Alleghany Mountains, in Georgia, north. Winters from Ba- 

 hamas and eastern Mexico, south. 



Nest, in fork of bush, three to eight feet up, of bark shreds and 

 grass, lined with plant down and hair. Eggs, 4-5; creamy-white, with 

 markings of reddish and dark brown, chiefly wreathed about the 

 larger end; .05 by .49. 



A common migrant most years, but sometimes rather rare. In the 

 extreme northern part of the State it is a summer resident; Laporte 



