THE BLACK-THROATED BLUE WARBLER. O25 
throat, lustrous black, this color extending in a broad lateral stripe to the tail; rest 
of under parts, including the axillary region, white; wings and tail black above, the 
former with a conspicuous white patch formed by the bases of all the primaries 
(except the first); the inner webs of the secondaries and tertials with similar patches 
towards the base and along the inner margin; all the tail feathers, except the inner- 
most, with a white patch on the inner web, near the end. 
Female, olive-green above and dull-yellow beneath; sides of head dusky-olive, 
the eyelids and a superciliary stripe whitish; traces of the white spot at the base of 
the primaries and of the tail. 
Length, five and fifty one-hundredths inches; wing, two and sixty one-hun- 
dredths; tail, two and twenty-five one-hundredths inches. 
This Warbler is not uncommon in the mountainous dis- 
tricts of Massachusetts, from the middle to the end of May ; 
and I found several specimens in the Green-Mountain coun- 
try as late as the 10th of June. This occurrence, together 
with the fact that it has been ‘found, in the breeding season, 
on Mount Holyoke, in Mass., and along the ridges in the 
western part of this State, shows that it probably breeds, 
sometimes at least, in Massachusetts. 
The individuals that I saw were in tall oaks and chest- 
nuts, actively moving about through the foliage, snapping at 
flies and other insects: they often uttered a faint, drawling 
wéesy, wéesy, and occasionally a louder chirp or chink, like 
that of the Nashville Warbler. 
Being unacquainted with the nest and eggs, I give Audu- 
bon’s description of them :— 
“The nest is usually placed on the horizontal branch of a fir-tree, 
at a height of seven or eight feet from the ground. It is composed 
of slips of bark, mosses, and fibrous roots, and is lined with fine 
grass, on which is laid a warm bed of feathers. : 
“The eggs, four or five in number, are of a rosy tint, and, like 
those of most other Sylvia, scantily sprinkled with reddish-brown 
at the larger end. Only one brood is raised in a season.” 
About the first week in September, this species leaves 
New England on its southern migration. 
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