_Description._--Crown of head and nape rich rufous-brown; all the rest of the upper parts, including the entire tail and wing-coverts and the outer webs of the remiges, rich olive-green; cheeks and upper throat whitish; ear-coverts blackish, with white central streaks; under wing-coverts, axillaries, inner margin of remiges, and under tail-coverts lemon-yellow; rest of underparts dull yellow, washed with olive on the breast and flanks, and inclining to pale ochreous on the abdomen; bill dark flesh-colour; feet hazel: total length 4·5 inches, wing 2·2, tail 2·2. _Female_ similar. _Hab._ Southern Brazil, Paraguay, and Northern Argentina. This South-Brazilian species was met with by White near San Javier, in the province of Misiones, in June 1881. 23. CYCLORHIS OCHROCEPHALA. (OCHRE-HEADED GREENLET-SHRIKE.) [Plate III. Fig. 1.] [Illustration: Fig. 1. CYCLORHIS OCHROCEPHALA.} " 2. " ALTIROSTRIS. }] +Cyclorhis viridis+, _Burm. La-Plata Reise_, ii. p. 472; _Scl. et Salv. Nomencl._ p. 13; _Durnford, Ibis_, 1878, p. 58 (Punta Lara); _White, P. Z. S._ 1882, p. 595 (Buenos Ayres); _Gadow, Cat. B._ viii. p. 318. +Cyclorhis ochrocephala+, _Tsch. Arch. f. Nat._ 1845, pt. i. p. 362; _Berl. et Jher. Zeitschr. ges. Orn._ 1885, p. 116. _Description._--Above olive-green; cap brownish ochraceous, more or less rufescent; front and superciliaries chestnut-red; sides of head clear grey, beneath pale buff; breast and flanks yellow; throat greyish white; bill reddish grey, feet grey; eye reddish: total length 7·0 inches, wing 3·4, tail 2·8. _Female_ similar. _Hab._ Middle districts of Argentina. This species is not uncommon in the woods along the shores of the Plata, and may be easily known to any person penetrating them by its loud "cheerful soliloquy," for that phrase of Mr. Barrows, the North-American writer on birds, well describes the artless, light-hearted song which it utters at intervals while it roams about in the deep foliage, and which reminds one of the careless whistling of a boy, whistling merely to express his gaiety, but without having any particular tune in his mind. It is migratory, and extends its range south of Buenos Ayres. 24. CYCLORHIS ALTIROSTRIS, Salvin. (DEEP-BILLED GREENLET-SHRIKE.) [Plate III. Fig. 2.] +Cyclorhis altirostris+, _Salv. Ibis_, 1880, p. 352; _Gadow, Cat. B._ viii. p. 319. +Cyclorhis viridis+, _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 88 (Concepcion, Entrerios); _Berl. et Jher. Zeitschr. ges. Orn._ 1885, p. 116.