Wings of moderate length, the outer three quills almost equal, the third longest; tail slightly emarginate. Male with the upper parts bluish-grey, spotted with black; the upper part of the head, which is similarly spotted, the cheeks, and sides of the neck, bright yellow; throat black; breast and abdomen white; ground and tail-feathers greyish-dusky; two white bands on the wing formed by the tips of the secondary coverts and first row of small coverts; two outer tail-feathers on each side almost entirely white. Female with the upper parts of a duller grey, the yellow of the head less extended and not so bright; throat whitish, spotted with dusky. _Male_, 3-5/12, wing 2-8/12. Columbia River. Migratory. Sylvicola occidentalis, Hermit Wood-Warbler, Towns. Journ. Acad. Nat. Sc. Philadelphia, v. vii. p. 190. Hermit Warbler, Sylvia occidentalis, Aud. Orn. Biog. v. v. p. 55. 94. 19. Sylvia nigrescens, Towns. Black-throated Grey Wood-Warbler. Plate CCCXCV. Figs. 5 and 6. Male. Wings of moderate length, with the outer three quills nearly equal, the second longest, the first shorter than the fourth; tail slightly rounded and emarginate. Male with the upper parts bluish ash-grey, the middle of the back and tail-coverts streaked with black; the upper part of the head and neck, the loral space and cheeks, and the fore part of the neck, with a small portion of the breast black; a band from the nostril to near the eye yellow; a band over the eye, and another from the lower mandible along the side of the neck white; breast and abdomen white, the sides tinged with grey, and streaked with black; wings blackish-brown, with two white bands formed by the tips of the secondary coverts and first row of small coverts; quills edged with light grey; tail blackish-brown, the two outer feathers on each side almost entirely white, the next with a white patch on the inner web. _Male_, 5, wing 2-8/12. Columbia River. Migratory. Sylvia nigrescens, Black-throated Grey Warbler, Journ. Acad. Nat. Sc. Philadelphia, v. vii. p. 191. Black-throated Grey Warbler, Sylvia nigrescens, Aud. Orn. Biog. v. v. p. 57. 95. 20. Sylvicola canadensis, Linn. Canada or Black-throated Blue Wood-Warbler. Plate CLV. Male. Plate CXLVIII. Female and Young. Wings rather long, with the third quill longest, the second almost equal, the fourth longer than the first; tail even. Male dull light blue above, white beneath; frontal band, cheeks, throat, and sides, black; a white patch on the wing formed by the bases of the primaries; outer three tail-feathers with a patch of white on the inner web near the end, all the rest with a touch of the same. Female greenish-olive above, light dull-yellow below, with a less extended white patch on the wing, the white on the tail unconspicuous. Young similar to the female. _Male_, 5, 7-1/2. From Texas northward. Migratory. Abundant. Motacilla canadensis, Linn. Syst. Nat. v. i. p. 334.