592 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Sylvia iderocephala Yieillot, Ois. Am. Sept., ii, 1807, 31, pi. 90; Nouv. Diet. d'Hist. 

 Nat., xi, 1817, 223; Enc. Metli., ii, 1823, 441.— Stephens, Shaw's Gen. Zool., x, 

 1817, 622.— Bonaparte, Ann. Lye. N. Y., ii, 1826, 80.— Audubon, Orn. Biog., i, 

 1832, 306, pi. 59.— NuTTALL, Man. Orn. U. S. and Can., i, 1832, 380. 



Sylvicola icterocephala Jardine, ed. Wilson's Am. Orn., i, 1832, 248. — Richardson, 

 Rep. Brit. Assoe. for 1836(1837), 172.— Bonaparte. Geog. andComp. List 1838 

 22. — Audubon, Synopsis, 1839, 54; Birds Am., oet. ed., ii, 1841, 35, pi 81 — 

 Bryant, Proc. Bost. Soe. N. H., vi, 1857, 116 (Nova Scotia); vii, 1859 110 

 (Bahamas). — Albrecht, Journ. fiir Orn., 1861, 153 (Bahamas). 



[Sylvicola\ icterocephala Bonaparte, Consp. Av., i, 1850, 308. 



Dendrceca icterocephala Sclater, Proc. Zool. Soe. Lond., 1859, 363 ( Jalapa). — Caba- 

 Nis, Journ. fiir Orn., 1860, 328 (Costa Rica) . 



Dendroeca icterocephala Sundevall, Ofv. k. Yet.-Akad. Forh. Stockh., xxvi, 1870, 

 612 (monogr.). 



Dendroica icterocephala Sclater, Proc. Zool. Soe. Lond., 1859, 374 (Oaxaea, Apr.). 



IMniotilta'] icterocephala Giebel, Thesaurus Orn., ii, 1875, 603. 



DENDROICA CASTANEA (Wilson). 

 BAY-BREASTED WARBLER. 



Adult male {summer and vnnter). — Forehead, sides of crown and 

 occiput, auricular region, suborbital region, lores, and malar region 

 black, the auricular region usually more or less streaked with whitish 

 or pale bully; crown and occiput (except laterall}') rich chestnut; sides 

 of neck plain l)uff; back and scapulars gray, usuall}" more or less 

 tinged (sometimes strongl}') with buffy olive, and liroadly streaked 

 with black; rump similar, but with streaks obsolete or concealed; 

 upper tail-coverts gray, with more or less distinct mesial streaks of 

 blackish; tail grayish black or dusky with light-gra}- edgings, the inner 

 webs of two or three outermost rectrices with a terminal patch of 

 white, that on exterior rectrix occupying the terminal third or more; 

 wings grayish black or dusky with light olive-gray or olive edgings, 

 the middle and greater coverts broadly tipped with white, forming 

 two conspicuous bands across wing; throat (sometimes chin also^), 

 chest, sides, and flanks plain light chestnut; rest of under parts plain 

 pale buif or bufi^y white, the inider tail-coverts more decidedly butfy; 

 maxilla dark l)rown or ])rownish black, mandible more brownish; iris 

 brown; legs and feet dusky brownish (in dried skins); length (skins), 

 119.4-130. S (125); wing, 71 .'6-76. 2 (78.1:); tail,. 51. 8-56.4 (53.1); exposed 

 culmen, 9.9-10.9 (10.4); tarsus, 17.5-20.3 (18.3); middle toe, 10.4-11.9 

 (11.2).^ 



Adult female {summer and winter). — Essentially similar to the male 

 except in extent of the chestnut, which is often almost entirely absent, 

 and never so strongly marked; whole pileum usually distinctly streaked 

 with black on a gra}', olive, or olive-green ground, the crown and 



' The chin, or at least its anterior margin, is usually dusky, sometimes whitish. 

 ■■' Eight specimens. 



