BLACK-THROATED GREEN WARBLER. 183 
and black; a line of white extends over the eye; the rose color also 
reaches to the base of the bill, where it is speckled with black and 
white. The female is of a light yellowish, flaxen color, streaked with 
dark olive, and whitish; the breast is ‘streaked with olive, pale flaxen, 
and white ; the lining of the wings is pale yellow; the bill, more dugky 
than in the male, and the white on the wing less. 
BLACK-THROATED GREEN WARBLER. —SYLVIA VIRENS. — 
. , Fie. 79. 
Motacilla virens, Gmel. Syst. i. p. 985.— Le Figuier 4 cravate noire, Buff. v. p. 
298. — Black-throated Green Flycatcher, Edw. t. 300.— Green Warbler, Arct. 
Zool. ii, No. 297. — Lath. Syn. iv. p. 484, 108. — Turton, Syst. p. 607. — Paras 
viridis gutture nigro, The Green Black-throated Flycatcher, Bartram, p. 292. 
SYLVICOLA VIRENS.—Swatnson. 
Sylvia virens, Bonap. Synop. p. 80. 
Tuis is one of those transient visitors that pass through Pennsyl- 
vania, in the latter part of April and beginning of May, on their way 
to the north to breed. It generally frequents the high branches and 
tops of trees, in the woods, in search of the larve of insects that prey 
on the opening buds. It has a few singular cheruping notes; and is 
very lively and active. About the 10th of May it disappears. It is 
rarely observed on its return in the fall, which may probably be owing 
to the scarcity of its proper food at that season obliging it to pass 
with greater haste; or to the foliage, which prevents it and other pas- 
sengers from being so easily observed. Some few of these birds, 
however, remain all summer in Pennsylvania, having myself shot three 
this season, (1809,) in the month of June; but I have never yet seen 
their nest. 
This species is four inches and three quarters long, and seven 
broad; the whole back, crown, and hind head, is of a rich yellowish 
green; front, cheek, sides of the breast, and line over the eye, yellow ; 
chin and throat, black; sides, under the wings, spotted with black; 
belly and vent, white; wings, dusky black, marked with two white 
bars; bill, black; legs and feet, brownish yellow; tail, dusky, edged 
with light ash; the three exterior feathers spotted on their inner webs 
with white. The female is distinguished by having no black on the 
throat. 
