WARBLERS 525 



667. Dendroica virens (Gmel.). Black-throated Green 

 Warbler. 



Plumage of adult male : bright olive green above ; wings and tail black- 

 ish, the feathers outwardly narrowly edged with grayish ; inner webs of 

 primaries as viewed from below edged with white ; wing coverts black, edged 

 slightly with olive greenish and tipped with white, forming two white bands 

 on each wing ; inner webs of outer tail feathers white and outer web of the 

 outer feather white at base ; ear coverts dusky ; line over eye and cheeks 

 bright yellow ; throat and breast black ; belly white or whitish, tinged with 

 yellow ; sides streaked with black. Plumage of adult female : chin yellow, 

 merely spotted with black ; black of throat and breast more restricted ; in 

 general duller and wings and tail slightly browner than in male but in many 

 very bright females the only difference is in the chin being yellow or merely 

 spotted with black. Immature plumage : similar to adult female but without 

 any black on throat, being a faint yellow below, brighter on cheeks and over 

 eye ; concealed or suffused blackish markings on breast, due to the feathers 

 being yellow tipped and black towards base which is largely concealed by 

 the overlapping yellow tips. Wing 2.50 ; tail 1.95. 



Geog. Dist. — Eastern North America, breeding from southern New 

 England, north to Newfoundland and in the mountains of New York and of 

 Pennsylvania, also breeding in northern Illinois, Wisconsin, Minnesota north 

 to Hudson Bay ; breeding occasionally in the mountains of South Carolina ; 

 migrating southward east of the Plains ; wintering in Mexico, Guatemala 

 and Costa Rica. 



County Records. — Androscoggin ; fairly common summer resident, (John- 

 son). Aroostook ; fairly common at Fort Fairfield, (Batchelder, B. N. 0. C. 

 7, p. 109). Cumberland; common summer resident, (Mead). Franklin; 

 common summer resident, (Swain). Hancock; common summer resident, 

 (Knight). Kennebec; common summer resident, (Gardiner Branch). Knox ; 

 summer (Rackliff). Oxford; breeds commonly, (Nash). Penobscot; com- 

 mon summer resident, (Knight). Piscataquis; common, breeds, (Homer). 

 Sagadahoc; common summer resident, (Spinney). Somerset; quite common 

 summer resident, (Morrell). Waldo; common summer resident, (Knight). 

 Washington ; abundant siunmer resident, (Boardman). York; common here 

 and nests, (W. L. Fernald). 



Mr. Brown has recorded the date of arrival as occasionally 

 as early as April twenty-eighth, more often May sixth to 

 tenth, and the time of departure as the end of September. 

 Near Bangor they most often arrive about May twelfth and 

 are gone by September twentieth. In migration they frequent 

 mixed woods, or even open hard wood growth, and are occa- 

 sionally found along the highways in bushes and shrubbery. 



