This article gives field-notes on seven species, of which examples were obtained near Frayle Muerto, in the province of Cordova, and 33 species from near Gualeguaychú in Entrerios. The specimens were determined by myself and Salvin. LEYBOLD, Dr. FRIEDRICH. Dr. Leybold was resident in Santiago, Chili, for some years, and sent bird-skins and other objects of natural history to Munich for sale in Europe. He published two papers on supposed new birds obtained by his collectors during their excursions from Chili to Mendoza. (1) Beschreibung von vier neuen Vogelarten aus der Argentinischen Provinz Mendoza. Journ. f. Orn. 1865, pp. 401-406. [Describes as new _Synallaxis crassirostris_, _Myiarchus fasciatus_, _Sporophila rufirostris_, and _Phrygilus ornatus_, from Mendoza. These species are all referred to in our work.] (2) Beschreibungen einiger Thiere und Pflanzen aus den Anden Chile's und der Argentinischen Provinzen. Leopoldina, viii. p. 52 (1873). [This paper contains descriptions of _Conurus glaucifrons_, from San Luis (=_Conurus acuticaudatus_), _Colaptes leucofrenatus_ (=_Chrysoptilus cristatus_), and _Columbina aurisquamata_ (=_Metriopelia aymara_), all from Mendoza.] ORBIGNY, ALCIDE D'. Voyage dans l'Amérique Méridionale (le Brésil, la République Orientale, de l'Uruguay, la République Argentine, la Patagonie, la République du Chili, la République de Bolivia, la République du Pérou), exécuté pendant les Années 1826-33. Vol. IV. Oiseaux. Paris, 1835-44. 4to, 396 pp., 66 pl. After Azara's 'Apuntamientos' this is the most important of the older publications relating to Argentine ornithology. The celebrated French traveller and naturalist d'Orbigny made extensive collections of birds in several parts of the Argentine Republic, especially in Corrientes, on the Paraná, near Buenos Ayres, and on the Rio Negro. The birds were worked out by himself after his return home, with the assistance of the well-known French ornithologist the Baron F. de la Fresnaye. The list of them, with the descriptions of the new species, was first published in two consecutive volumes of the 'Magasin de Zoologie' (for 1837 and 1838), with a separate title[13] and separately paged. It was unfortunately never completed, and contains only the Accipitres, Passeres, and Picariæ. The valuable notes and remarks of d'Orbigny were subsequently published in the fourth volume of his 'Voyage,' of which the title is given above. This work also, as is much to be regretted, was brought to a sudden termination when only half finished. [13] Synopsis avium ab Alcide d'Orbigny in ejus per Americam meridionalem itinere collectarum et ab ipso viatore necnon A. de la Fresnaye.