Wings of moderate length, with the outer two quills almost equal, the first longest, the third little shorter; tail very slightly emarginate. Male with the upper parts yellowish-green, spotted with dusky, the head greenish-yellow; secondary coverts and first row of small coverts largely tipped with white; quills and tail-feathers blackish-brown; primaries narrowly edged with greenish-white, secondaries broadly with white; outer two tail-feathers with the greater part white; a bright yellow streak over the eye; a dusky band on the lore and behind the eye; fore neck and breast bright yellow, the rest of the lower parts white, the sides streaked with black. Female similar to the male, but rather paler. Young with the upper parts light olive-brown; a pale line over the eye, which is encircled by a narrow line of whitish; wings and tail dark brown, the former with two brownish-white bands, the quills edged with brownish-white, the two outer tail-feathers with a white patch on the inner web; the lower parts dull white, tinged on the neck with yellow, on the sides with greyish-brown. _Male_, 5-1/2, 8-1/2. Middle districts. Rather common. Migratory. Hemlock Warbler, Sylvia parus, Wils. Amer. Orn. v. v. p. 114. Male. Autumnal Warbler, Sylvia autumnalis, Wils. Amer. Orn. v. iii. p. 65. Young. Sylvia parus, Bonap. Syn. p. 82. Sylvia autumnalis, Bonap. Syn. p. 74. Hemlock Warbler, Sylvia parus, Aud. Orn. Biog. v. ii. p. 205. Adult. Autumnal Warbler, Sylvia autumnalis, Aud. Orn. Biog. v. i. p. 447. 84. 9. Sylvicola virens, Lath. Black-throated Green Wood-Warbler. Plate CCCXCIX. Fig. 1. Male. Fig. 2. Female. Outer three quills almost equal, second very slightly longer; tail slightly emarginate. Male with the upper parts very light yellowish-green; the anterior part of the forehead, a band over the eye, the cheeks, and the sides of the neck, bright yellow; the fore part of the neck, anterior part of the sides, and some spots on the hind parts of the latter, black; the rest of the lower parts white, partially tinged with yellow; quills and tail-feathers brownish-black; secondary coverts and first row of small coverts largely tipped with white, quills margined with greyish-white, as are the tail-feathers, of which the greater part of the outer three, and a patch on the inner web of the fourth, are white. Female with the upper parts similar, but with less yellow on the forehead; ear-coverts greenish; the yellow band over the eye less bright, the yellow on the sides of the neck of less extent; the lower parts dull yellowish-white, the sides streaked with dusky. _Male_, 4-10/12, wing, 2-1/2. _Female_, 4-1/2, wing, 2-((5-1/2)/12). From Texas to Newfoundland. Abundant. Migratory. Black-throated Green Warbler, Sylvia virens, Wils. Amer. Orn. v. ii. p. 127. Sylvia virens, Bonap. Syn. p. 80. Black-throated Green Warbler, Nutt. Man. v. i. p. 376.