SP. CHAR. _Male, in spring._ Bill dark bluish-black, rather lighter beneath. Tail dusky. Top of head light grayish-blue. Front, lore, cheek, and a stripe under the eye, black, running into a large triangular patch on the back between the wings, which is also black. Eyelids and a stripe from the eye along the head white. Upper tail-coverts black, some of the feathers tipped with grayish. Abdomen and lower tail-coverts white. Rump and under parts, except as described, yellow. Lower throat, breast, and sides streaked with black; the streaks closer on the lower throat and fore breast. Lesser wing-coverts, and edges of the wing and tail, bluish-gray, the former spotted with black. Quills and tail almost black; the latter with a square patch of white on the inner webs of all the tail-feathers (but the two inner) beyond the middle of the tail. Two white bands across the wings (sometimes coalesced into one) formed by the middle and secondary coverts. Part of the edge of the inner webs of the quills white. Feathers margining the black patch on the back behind and on the sides tinged with greenish. Length, 5 inches; wing, 2.50; tail, 2.25. Autumnal males differ in absence of black of back, front, sides of head, and to a considerable degree beneath, and in much less white on the wings and head. _Female in spring._ Similar, but all the colors duller. Black of the back restricted to a central triangular patch. HAB. Eastern Province of North America to Fort Simpson; Eastern Mexico to Guatemala and Panama; Bahamas; Cuba (very rare). HABITS. The Black and Yellow Warbler, one of the most beautiful of this attractive family, was supposed by our earlier writers to be exceedingly rare. Wilson never met with more than two specimens,—one in Ohio, the other on the Mississippi,—and spoke of it as a very scarce species. In regard to its song he was quite at fault, denying to it any notes deserving the name of song. Nuttall, who had only seen it occasionally in Massachusetts, in the middle of May, regarded it as rare, and was unacquainted with its notes. Its history is now much better known, and neither its great rarity nor its deficiency as to melody can any longer be admitted.