_Description._--Uniform brownish black; bill and feet yellow: total length 11·5 inches, wing 5·3, tail 4·5. _Female_ similar. _Hab._ Bolivia and Northern La Plata. "I have noticed this bird in the provinces of Mendoza, San Juan, San Luis, Cordova, and Catamarca, where it is much esteemed as a cage-bird on account of its beautiful whistle. In Mendoza it goes by the name of 'Zorsal,' in Catamarca and Cordova by that of 'Merlo,' and in Andalgala (Catamarca province) 'Chocoyno.'"--_White, l. s. c._ "Very common at Mendoza, Cordova, and Tucuman, and met with among the shady trees of the promenades: has a better song than our Blackbird, which is heard at a distance, especially in the evening. Called 'Crispin' in Tucuman."--_Burm. l. s. c._ 5. TURDUS NIGRICEPS, Cab. (BLACK-HEADED THRUSH.) +Turdus nigriceps+, _Cab. J. f. O._ 1878, p. 195. _Description._--Above slaty grey, head black; below paler, chin white, striped with black; middle of belly and crissum white; bill and feet pale yellow: total length 7·6 inches, wing 4·4, tail 3·5. _Female_ olive-brown, paler below, chin pale ochraceous; middle of belly and crissum white; bill brown, feet yellowish. _Hab._ Peru, Bolivia, and Northern La Plata. Met with by Dr. A. Döring and Herr Schulz on the Sierra of Cordova. 6. MIMUS MODULATOR, Gould. (CALANDRIA MOCKING-BIRD.) +Mimus modulator+, _Sharpe, Cat. B._ vi. p. 347. +Mimus calandria+, _Burm. La-Plata Reise_, ii. p. 475; _Scl. et Salv. Nomencl._ p. 3; _Hudson, P. Z. S._ 1870, p. 89 (Buenos Ayres); _Durnford, Ibis_, 1877, p. 167 (Buenos Ayres); _White, P. Z. S._ 1883, p. 37 (Cordova); _Barrows, Bull. Nutt. Orn. Cl._ viii. p. 85 (Concepcion). _Description._--Above dark grey, faintly mottled with pale grey; rump tinged with brown; wings nearly black, the feathers edged with brownish white; tail black, the feathers, except the two middle ones, broadly tipped with white; under surface dirty white; bill and legs black; eye olive-green: total length 11·0 inches, wing 4·5, tail 4·9. _Female_ similar. _Hab._ Paraguay, Uruguay, and Argentine Republic. Azara has not failed to remark that it would be well to find a more appropriate name for this species, which was absurdly called "Calandria" (_i. e._ Sky-Lark) by the early colonists of the Plata. Use is, however, too strong to be easily set aside, and the name is now familiar to everyone in the Argentine Province. Moreover, by a curious irony of fate, the Spanish naturalist himself, by employing this unsuitable name in his 'Apuntamientos,' even while protesting against it, has been the cause of its introduction into scientific nomenclature.