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BLACK-THROATED BLUE WARBLER 



Nestling (?. — Above brownish olive-green, lores' black, auriculars blackish, 

 a whitish superciliary line; throat and breast somewhat paler than back or 

 dusky yellowish, belly whitish or yellowish white; tail as in young c?, black 

 edged with blue and marked with white; wings as in young c?, black the 

 feathers edged with blue or greenish with a white patch at the base of the 

 primaries; wing-coverts like back, edged with brownish. 



Nestling 5- — Paler than nestling c?, no black in lores or auriculars; below as 

 in nestling <?, wings and tail as in young Fall ?, greater and median wing- 

 coverts like back, edged with brownish. 



General Distribution. — Eastern North America; north to New- 

 foundland and Hudson Bay ; west to the Mississippi River. 



Summer Range. — Common as a breeder jn the southern portion 

 of Quebec and south in the mountains to Maryland; less common 

 north to Newfoundland, northeastern Quebec, and northern Ontario. 

 Outside of the mountains it breeds south through northern New 

 England to Massachusetts (Berkshire) and Connecticut (Eastford), 

 to New York (Oneida and Hamilton Counties), southern Michigan 

 (Detroit), northwestern Michigan (Porcupine Mountains), and 

 northern Minnesota. 



South of the breeding range it occurs rarely west of the 

 Mississippi in Iqwa and Missouri; accidentally in Nebraska (Lincoln, 

 Omaha, West Point), Kansas (Finney Co., October 17, 1891), Colo- 

 rado (Denver, May 24, 1888, Yuma, September 19, 1904), New 

 Mexico (Gallinas Mountains, October 8, 1904,) and California (Faral- 

 lones, November 17, 1886). 



Winter Range. — The West Indies north to Florida ( Key West) . 

 Accidental in Guatemala and Colombia. 



Spring Migration. — 



