_Hab._ S.E. Brazil, Paraguay, Uruguay, and La Plata. The Red-bellied Thrush, distinguished from the species just described by its larger size and the bright rufous colour of its under plumage, is common everywhere in the Plata region, and does not appear to be migratory. It is a noisy, strong-winged, quarrelsome bird, closely resembling the Dusky Thrush in its manners. It inhabits forests, runs on the ground in search of food, and when approached darts away with loud chuckling notes, flying close to the ground. These birds are also often seen pursuing each other through the trees with loud harsh screams. The song has a faint resemblance to that of the English Song-Thrush, being composed of a variety of notes uttered in the same disconnected manner, with frequent pauses; but it is, both in sweetness and strength, inferior to that of the English bird. As a rule this Thrush sings concealed in a thick bush or tree. The nest is deep, well made, plastered inside with mud, and concealed in the centre of a large bush or low tree. The eggs are four, pale blue in colour, and thickly spotted with brown. 3. TURDUS MAGELLANICUS, King. (MAGELLANIC THRUSH.) +Turdus magellanicus+, _Seebohm, Cat. B._ v. p. 223, pl. xiv. +Turdus falklandicus+, _Scl. et Salv. Nomencl._ p. 2; _Hudson, P. Z. S._ 1872, p. 548 (Rio Negro); _Döring, Exp. al Rio Negro, Zool._ p. 36 (R. Colorado and R. Negro). _Description._--Head, wings, and tail brownish black; the remaining portions of upper surface brownish olive; under surface pale rufous, obscure on the breast; throat white, striped with black; bill and feet dull yellow: total length 10·5 inches, wing 7·5, tail 4·0. _Female_ similar. _Hab._ Patagonia and Chili. This Thrush, which I met with on the Rio Negro of Patagonia, so closely approximates to _T. rufiventris_ in colour, language, and habits, that the casual observer finds it difficult to distinguish one from the other. Its nest and eggs are also precisely like those of its northern representative. The song is, however, much poorer, and reminds one of the first attempts of a young bird. That a member of so melodious a family should have so inferior a song I attribute to the fact that Thrushes (unlike the songsters of other genera) sing only in the warm season and when the air is calm. In the southern portion of the South-American continent violent winds prevail in summer, so that this southern Thrush sings perhaps less frequently than any other song-bird, and appears to be losing the faculty of song altogether. 4. TURDUS FUSCATER, d'Orb. et Lafr. (ARGENTINE BLACKBIRD.) +Turdus fuscater+, _Scl. et Salv. Nomencl._ p. 2; _White, P. Z. S._ 1882, p. 593 (Catamarca); _Burm. La-Plata Reise_, ii. p. 474 (Mendoza, Cordova, and Tucuman). +Merula fuscatra+, _Seebohm, Cat. B._ v. p. 243.