146 BIRDS OP ILLINOIS. 



have been merely belated migrants. Mr. T. H. Douglas, of Wauke- 

 gan, writes me that he saw a pair of Chestnut- sided Warblers at 

 that place on the 31st of July, and that "as the male had a worm 

 in his mouth they evidently had young." 



This species has a very pretty song, resembling somewhat that 

 of the summer Yellowbird (D. (sstiva), but "less of a whistle and 

 somewhat louder." The nest is built in bushes, along the edge of 

 a thicket or low woods, and resembles in its materials that of other 

 species of the genus, while the eggs also are lacking in distinctive 

 characteristics. 



Dendroica castanea (Wils.) 



BAY-BBEASTED WARBLEK. 



Popular synonym. Autumnal Warbler. 



Sylvia castanea Wns. Am. Orn. ii, 1810. 97, pi. 14,flg. 4. NUTT. Man. i.1832,382. AUD. Orn. 



Biog. U832.358.pl. 69. 



Sylvicola castanea RICH. AUD. Synop. 1839,53; B. Am. ii, 1841, 34, pi. 80. 

 Dendroica castanea BAIED.B. N. Am. 1858, 276; Cat. N. Am. B. 1859, No. 197; Review. 



1865.189. B. B. B. Hist. N. Am. B. i,1874,251,pl. 13,flgs. 4,5. 



Dendrveca castanea LAWE. CouES.Key, 1872,101; Check List, 1873, No. 82; 2d ed. 1882, 



No. 123; B. N. W. 1874, 61; B. Col. Val. 1878,243. Rroow. Nom. N. Am. B. 1881. No. 100. 



Sylvia autumnalis WILS. Am. Orn. iii,1811,65,pl.23,flg. 3. NUTT. Man. i.1832,390. AUD. 



Orn.Biog.i,1832.449,pl.88. 



HAS. Eastern North America, north to Hudson's Bay, west to edge of Great Plains ; 

 breeding from northern New England northward. Winters in Central America and 

 northern South America (Colombia). 



"Sp. CHAB. Male. Crown dark reddish chestnut; forehead and cheeks, including a 

 space above the eye, black; a patch of buff-yellow behind the cheeks. Best of upper 

 parts bluish gray streaked with black, the edges of the interscapulars tinged with yel- 

 lowish, of the scapulars with olivaceous. Primaries and tail-feathers edged externally 

 with bluish gray, the extreme outer ones with white; the secondaries edged with oliva- 

 ceous. Two bands on the wing and the edges of the tertials white. The under parts are 

 whitish with a tinge of buff; the chin, throat, forepart of breast, and the sides, chestnut- 

 brown, lighter than the crown. Two outer tail-feathers with a patch of white on the inner 

 web near the end; the others edged internally with the same. Female with the upper 

 parts olive, streaked throughout with black, and an occasional tinge of chestnut on the 

 crown. Lower parts with traces of chestnut, but no stripes. Length of male, 5. 00; wing, 

 3.05; tail,2.40. 



"The females and immature males of this species differ much 

 from the spring males, and are often confounded with other species, 

 especially with D. striata. A careful comparison of an extensive series 

 of immature specimens of the two species shows that in castanea 

 the under parts are seldom washed uniformly on the throat and breast 

 with yellowish green, but while this may be seen on the sides of the 

 neck and breast, or even across the latter, the chin and throat are 



