562 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Dendrocca tnimsendi Sundevall, Ofv. k. Vet.-Ak. Forh. Stockh., xxvi, 1870, 610 



(monogr. ). 

 \_Dendrceca'] toimsend'd Coues, Key N. Am. Birds, 1872, 98. 

 l^Dendrrecii] tovmsejidi Sclater and Salvin, Nom. A v. Neotr., 1873, 9. 

 [Dendra'ca] townsendi Coues, Key N. Am. Bird.s, 2d ed., 1884, 299. 



DENDROICA VIRENS iGmelin). 

 BLACK-THROATED GREEN WARBLER. 



Advlt male in spring and summer. — Pileum, hindneck, back, scapu- 

 lars, and rump plain yellowish olive-green, the back sometimes (more 

 rarely the pileum and rump also) narrowly streaked with black, and 

 the forehead sometimes with an elongated or oval median spot of yel- 

 lowish; sides of head and neck, including whole malar region and a 

 broad superciliary stripe, clear lemon-yellow, relieved by a more or 

 less broad postocular streak of olive-green, this sometimes involving 

 greater part of the auricular region; chin, throat, and chest (some- 

 times sides of In-east also) uniform l^lack, the first sometimes partly 

 3'ellow; rest of under parts white or yellowish white, the breast usu- 

 alW tinged (sometimes strongly) with A^ellow; sides and flanks heavily 

 streaked with black, the more anterior of these streaks usually con- 

 fluent with the black throat-patch at its postero-lateral portions; wings 

 and tail dusky with slate-gray edgings, the middle and greater wing- 

 coverts broadly tipped with white, forming two conspicuous l)ars 

 across wing; inner webs of two lateral rectrices mostly white, that of 

 the third with a large white terminal spot, the two outermost with 

 outer webs extensively white; bill blackish; iris brown; legs and feet 

 dark horn brown (in dried skins). 



Adult male in autumn andvnMcv. — Similar to the spring and sum- 

 mer plumage, but with feathers of the black throat-patch narrowly 

 tipped, or margined terminallv, with whitish.^ 



Adult female in i<pri'ug and summer. — Similar to the adult male of 

 corresponding season, but chin and more or less of throat usually 

 whitish or pale yellowish, the black of lower throat (if present there) 

 and chest more or less broken (sometimes almost hidden) by whitish 

 tips or terminal margins to the feathers; sides of breast never (?) uni- 

 form black. 



Young nude in first autmnn andtointer. — Very similar in coloration 

 to the adult female, but olive-green of upper parts and yellow on sides 

 of head brighter, and under parts more strongly tinged with yellow. 



Adult {i) female i)i autumn and irinter. — Similar to the spring and 

 summer plumage, but throat pale dull yellowish, more or less spotted 

 or blotched laterally and posteriorly with dusky olive, yellow on sides 

 of head paler, and dusky streaks on sides and flanks less distinct. 



^ These whitish terminal margins sometimes persist until April, but usually disap- 

 pear before then. 



