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Show 1868.] DR. H. BURMEISTER ON ARGENTINE ORNITHOLOGY. 633 3. Contributions to the Ornithology of the Argentine Republic and adjacent Lands. B y Dr. H E R M . B U R M E I S T E R, F.M.Z.S.-Part I. In the second volume of my ' Voyage through the States of La Plata,' and in Cabanis's 'Journal of Ornithology' (vol. viii. p. 241), I have given synopses of all the birds observed by myself during my journey through this country. These synopses were founded principally on observations made in the middle, northern, and western parts of this country, as I had not been long enough in the eastern parts to speak of the ornithology of that side of the republic with good success. Now, resident during the past five years in Buenos Ayres, I have studied the ornithology of this district, and have observed some new species, and others not sufficiently known. These I beg leave to bring to the knowledge of the learned Society which has honoured me by naming m e one of its foreign members. 1. HVPOMORPHNUS URUBITINGA, nob., Syst. Ueb. ii. 43. This remarkable bird I had already seen near Mendoza, but not sufficiently recognized, and therefore not included in m y synopsis. Now I know that it is found all over the whole country, and comes also up to Buenos Ayres, where it is observed on the island in the mouth of the river Parana, near Las Conchas, from time to time; but it is always of rare occurrence. 2. NISUS MAGNIROSTRIS, Gm.; I. c. ii. 76. Common in the vicinity of Buenos Ayres, and even on the towers of the churches in the city, where it is seen catching Pigeons. 3. Nisus GRACILIS, Temm.; I. c. p. 77. This handsome bird was brought me two years ago by a French hunter, who had shot it in the vicinity of Buenos Ayres. 4. CYMINDIS BOLIVIENSIS, sp. nov. C. fusco-nigra, remigibus rectricibusque subtus albo-fasciatis; cera pedibusque croceis : long. 18". W e have of this species one specimen in our museum, which was killed near Santa Cruz de la Sierra, in the woody plains of the interior of Bolivia. As I can find no description of this bird in the works fallen under m y inspection, I describe it as a new species. In size and figure entirely like the common Brazilian species Cym. uncinata. The bill not stronger, and of the same form, but rather longer; the upper mandible black, the under mandible whitish. The sides of the face, from the beak to the eyes, naked, with some black bristles in a row from the eye to the nostrils. Iris dark brown. The whole plumage blackish brown, but the bases of the feathers of the vertex, from the front to the occiput, white ; the nuchal feathers |