BLACK-THROATED GREEN WOOD-WARBLER. 
43 
march is also rapid, and by the middle of October they all seem to have 
passed beyond the limits of our most southern States. 
The food of this species consists during the summer months of various 
kinds of flies and caterpillars, many of the former of which it captures by 
darting after them from its perch, in the manner of Flycatchers and Yireos, 
emitting like them also a clicking sound from its bill. In the autumn it is 
often seen feeding on small berries of various sorts, in which respect also it 
resembles the birds just mentioned. I never found the nest of this bird, of 
which, however, Mr. Nuttall has given a minute description, which I 
shall here, with his permission, place before you. “ Last summer (1830), on 
the 8th of June, I was so fortunate as to find a nest of this species in a 
perfectly solitary situation, on the Blue Hills of Milton. The female was 
now sitting, and about to hatch. The nest was in a low, thick, and stunted 
Virginia juniper. When I approached near to the nest, the female stood 
motionless on its edge, and peeped down in such a manner that I imagined her 
to be a young bird ; she then darted directly to the earth and ran, but when, 
deceived, I sought her on the ground, she had very expertly disappeared ; 
and I now found the nest to contain four roundish eggs, white, inclining to 
flesh-colour, variegated, more particularly at the great end, with pale pur- 
plish points of various sizes, interspersed with other large spots of brown and 
blackish. The nest was formed of circularly entwined fine stripes of the 
inner bark of the juniper, and the tough white fibrous bark of some other 
plant, then bedded with soft feathers of the Robin, and lined with a few 
horse hairs and some slender tops of bent grass ( Agrostis ).” 
My friend describes the notes of this species as follows : — “ This simple, 
rather drawling, and somewhat plaintive song, uttered at short intervals, 
resembles the syllables He de' territica , sometimes tederisca, pronounced 
pretty loud and slow, and the tones proceeding from high to low.’ 7 These 
notes I am well acquainted with, but none can describe the songs of our 
different species like Nuttall. 
I have represented the male and female ; the latter, I believe, has not been 
hitherto figured. 
Black-throated Green Warbler, Sylvia virens, Wils. Amer. Orn., vol. ii. p. 127. 
Sylvia virens, Bonap. Syn., p. 80. 
Black-throated Green Warbler, Nutt. Man., vol. i. p. 376. 
Black-throated Green Warbler, Sylvia virens , Aud. Orn. Biog., vol. iv. p. 70. 
Outer three quills almost equal, second very slightly longer ; tail slightly 
emarginate. Male with the upper parts very light yellowish-green ; the an- 
terior part of the forehead, a band over the eye, the cheeks, and the sides of 
