MOURNING WARBLER 245 



eye-ring above and below the eye, the lores are black, the breast slate-black, 

 usually widely and more or less evenly tipped with grayish. The $ and young 

 c? of these species can be less readily determined since in such specimens the 

 Mourning develops a more or less well-marked whitish eye-ring. It is, how- 

 ever, usually incomplete and this fact in connection with the bird's shorter tail 

 will serve to separate it from Macgillivray's. Length (skin), 4.90; wing, 2.50; 

 tail, 2.00; bill, .45. 



Adult (S, Spring. — Head bluish slate, back, wings, and tail olive-green, no 

 white markings, no white eye-ring ; lores gray or blackish ; throat heavily tipped 

 with gray, these tips gradually decreasing in width posteriorly, leaving, usually, 

 a black area on the breast at its junction with the yellow of the rest of the 

 underparts, sides greenish. 



Adult S, Fall. — No specimens in early Fall plumage seen, but judging from 

 G. tolmiei, similar to adult <S in Spring but throat and breast more widely tipped 

 with whitish, the crown tipped with brownish. 



Young c?. Fall. — Similar to adult <S in Spring but crown brownish olive- 

 green slightly browner than back, a nearly complete whitish eye-ring, throat 

 and upper breast yellowish, the former paler, the feathers of the latter dusky 

 or blackish basally. 



Adult $, Spring. — Similar to adult 3 in Spring but bluish slate of head and 

 olive of back browner ; an inconspicuous whitish or gray eye-ring ; throat 

 and upper breast brownish gray. 



Adiilt 9, Fall. — Not seen. 



Young 5, Fall. — Above uniform olive-green, head without trace of gray; 

 below yellow, throat with a more or less evident trace of dusky, sides greenish ; 

 eye-ring less distinctly whitish than in adult ?. 



Nestling. — Above dark olive-brown, browner than in nestling of Gcuthlypis 

 trichas, sides and breast a more yellow brown, belly yellowish buff, median 

 and greater wing-coverts tipped with cinnamon-brown. 



General Distribution. — Eastern North America ; north to Nova 

 Scotia and Manitoba ; west almost to the Plains. 



Summer Range. — The Alourning Warbler is most common in sum- 

 mer near the northern limit of its range, in Manitoba, northern Minne- 

 sota, and central Ontario; and less common in eastern Assiniboia. It 

 is not uncommon as a breeder in Michigan (Porcupine Mountains). 

 southern Ontario (Toronto, Guelph), northern New York (Oneida, 

 Niagara, Ontario Counties), Vermont (Londonderry, Townsend), 

 New Hampshire (Mt. Moosilauke, North Woodstock, Intervale), 

 Massachusetts (Berkshire County), Maine (Franklin County), New 

 Brunswick, Prince Edward Island and Nova Scotia. It breeds also in 

 the Catskills and in some of the mountains of Pennsylvania (West- 

 moreland, Sullivan, Cambria, Clinton Counties), and West Virginia 

 (spruce belt). 



With the exception of a probably accidental occurrence in South 

 Carolina, it has not been recorded outside the mountains at any time 

 of the vear in the Atlantic and Gulf States from North Carolina to 



