14)) BIRDS OF ILLINOIS. 



hnve 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. eestiva), 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 BREASTED WARBLER. 



Popular synonym, .\utumnul WaililiT. 



.s.v'iio rnslnui-a WlLS. Am. Orn. ii, 1810.9;. pi. 11. tic. l.-XfTT. .Mnii. i,liSC,382.-AlM>. Oiii. 

 Bios. i. 1832. 358.pl. 09. 

 Su'virola caslanva Rich.— .\uD. Synop. 1839..53; B. Am. Ii.ls41.34.pl. 80. 

 Dendroica castanea Baird.B. S. Am. 1H5S, 27C: Cat. X. Am. B. 1859, No. 197; Ri'vivw. 



1865.189.-8. B. & R. Hist. X. Am. B. 1,1X74.251. pi. 13. (Iks. 4,5. 

 J)en(lr(Fca castanea Lawr.— CouES.Ki'v, 1X72,101: Chook List, 1(<73, Xo. 82; 2(1 ed. 1NS2, 

 No, 123; B. N. W. 1874, CI; B. Col. Val. 1«7«,243.— Ridciw. X<mi. X, Am. B. 1881. Xo. 100. 

 Suleitt aiitiimnali.i WlLS. .\m. Oin. iii.lsil.lw.pl. 23,nK. .3.— XfTT. Mini. i.l832.39il.— Al'D. 

 Orn. Blog. i,ls:t2,449.pl. 8s. 

 Hah. Enstorn North America, norlli to Hudson's Bay. M-ost to odgi' of Groat I'laliis; 

 liri'i'iiinK from northern No\v England nortlnvard. Winters in Central .\meriea and 

 northern South America (Colombia). 



"Sp. Char. Male. Crown dark reddish chestnut; forehead and cheeks, ineludini; a 

 space above tho eye, black; a patch of bulT-yellow behind the cheeks. Rest of U|ipcr 

 parts Iduish uray streaked with black, the edpcs of the interscapulars tinged with yel- 

 lowish, of the scapulars with olivaceous, rrinmrics and tail-feathers odsed externally 

 with bluish cruy, the extreme outer ones with while; the secondnries edned with oliva- 

 ceous. Two bands on the wins iind the edces of the tertials while. The under parts are 

 whitish with a tince of bulT; the chin.throal, forepart of breast, and the siiies, chestnut- 

 brown, liitliler than the crown. Two outer tail-feathers withapatcli of wliitoon the inner 

 web near the end; the others edcod internally with the same. AVi/mfcwith the upper 

 parts ollvo. streaked throughout with black. and an occasional tluKO of oliestnut on the 

 crown. Lower parts with tracen of chestnut, but no stripes. Length of male, 5.00; wint;, 

 3.05; tail, 2.40. 



"The ffinales and immature mules of this species differ much 

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

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

 of immature specimens of the two species shows that in raxtanea 

 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 



