SPECIES 15 . SYLVM VIRENS. 
BLACK-THROATED GREEN WARBLER. 
[Plate XVII.— Fig. 3.] 
Motacilla virens, Gmel. Syst. i, p. 985. — Le jiguier a cravate 
noire, Buff. v,p. 298. — Black-throated Green Fly catcher, 
t. 300. — Green Warbler, Arct. Zool. ii, JVo, 297. — Lath. Syn. 
IV, p. 484, 108. — Turton, Syst.p. 607. — Parus viridis gutture 
nigro, the Green Black -throated Flycatcher, Bahtram, 292.* 
This is one of those transient visitors that pass through Penn- 
sylvania, 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 larvae 
of insects that prey on the opening buds. It has a few singular 
chirrupping notes; and is very lively and active. About the 
tenth 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 passengers from 
being so easily observed. Some few of these birds, however, 
remain all summer in Pennsylvania, having myself shot three 
this season, 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 yel- 
lowish green; front, cheeks, 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 feath- 
ers spotted on their inner webs with white. The female is dis- 
tinguished by having no black on the throat. 
* Sylvia virens, Vieill. Ois, de I'Am, Sept, pi, 80 . 
