_Description._--Above yellowish green; the wing-coverts like the back; wing-feathers dusky brown, edged with olive-yellow; tail-feathers olive-green; crown of head to the occiput blue-grey; from the forehead a black mark extends to the eye and downward to the cheek; throat and under surface bright yellow; bill black; feet pale brown; eye brown: total length 5·6 inches, wing 2·4, tail 2·4. _Female_ similar, but without the black on the face. _Hab._ Brazil, Paraguay, and Northern Argentina. This is again the only species of a North- and Central-American genus which ranges so far south as Buenos Ayres. It visits us in summer, and is found singly or in pairs in woods and large plantations. It feeds both on the ground and in trees, and, while gleaning amongst the leaves, frequently pauses to utter its loud cheerful song, composed of seven or eight clear notes uttered with rapidity and emphasis. 19. BASILEUTERUS AURICAPILLUS, Sw. (GOLDEN-CROWNED WOOD-SINGER.) +Basileuterus auricapillus+, _Sharpe, Cat. B._ x. p. 393. +Basileuterus vermivorus+, _Scl. P. Z. S._ 1865, p. 283; _Scl. et Salv. Nomencl._ p. 10; _White, P. Z. S._ 1882, p. 594 (Misiones). _Description._--Above olive-yellow, lightest on the rump and upper tail-coverts; tail-feathers ashy brown, with yellowish margins; quills dusky; crown of head light orange-chestnut; nape and hind neck pale ashy grey; on each side of the crown a broad black stripe extending from the bill to the hind neck, also a streak of ashy white above the eye; under surface bright yellow; axillaries and under wing-coverts white; bill and feet brownish: total length 4·5 inches, wing 2·2, tail 2·05. _Female_ similar. _Hab._ South America. This species, which is widely spread over the northern portion of South America, was found in Paraguay by Azara, and in the province of Misiones by White. 20. SETOPHAGA BRUNNEICEPS, d'Orb. et Lafr. (BROWN-CAPPED WOOD-SINGER.) +Setophaga brunneiceps+, _Burm. La-Plata Reise_, ii. p. 473 (Tucuman); _Scl. et Salv. Nomencl._ p. 11; _White, P. Z. S._ 1882, p. 595 (Catamarca); _Sharpe, Cat. B._ x. p. 428. _Description._--General colour dull olive-yellowish; wing-coverts dark slaty grey; quills blackish; upper tail-coverts slaty grey, washed with olive; tail-feathers blackish--the outer pair white, the next pair white edged with black on the outer web, the third pair with a large white mark at the end; crown of head deep chestnut; neck slaty grey; under surface of body bright yellow; under tail- and wing-coverts white: total length 5·0 inches, wing 2·45, tail 2·4. _Female_ similar. _Hab._ Bolivia and Northern Argentina. White obtained a pair of these birds on the Sierra of Totoral, Catamarca, in July 1880. He describes them as quick in their movements and difficult to shoot. The species was originally discovered by d'Orbigny in Bolivia.