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Show 358 MESSRS. SCLATER AND SALVIN ON [Apr. 4, This Bolivian race of Asturina seems to be separable from the form already recognized, by its combination of the characters of several of its allies. The tail is like that of the Central-American A. ruficauda, from which, however, it differs in the dark head and rufous chest. The underparts resemble those of A. nattereri ; but the head is darker, and the tail is differently coloured. A. pucherani differs from the present bird in the lighter, almost creamy, colour of the underparts and primaries. A recent examination in the Paris Museum of the specimens referred to as Astur magnirostris by D'Orbigny (Syn. Av. p. 5; and Voy. p.. 91) proves them to belong to Asturina pucherani as defined in our synopsis of the genus Asturina (P. Z. S. 1869, p. 133, and Exot. Orn. p. 177, t. 89); though from D'Orbigny's remarks upon them we were previously in some doubt on this point. 5. A Revision of the Neotropical Anatidse. By P. L. S C L A T E R , M.A., Ph.D., F.R.S., and O S B E R T SALVIN, M.A., F.R.S. [Received April 4, 1876.] (Plate XXXIV.) Page I. Introduction 358 II. Preliminary remarks on tbe ^Neotropical Anatida*: 358 III. Synopsis of the species 360 IV. Table of their geographical distribution and remarks thereon... 409 I. INTRODUCTION. The greater part of this paper was written before the issue of the ' Nomenclator Avium Neotropicalium ' in 1873 ; and the systematic arrangement of the genera and species of Anatidse adopted in the ' Nomenclator' was taken from the MS., which was laid aside unfinished in consequence of the pressure of other matters. It has now been thought desirable to complete it for publication, in order to show the ground upon which certain species were included in the list, and in order to give a more complete account of the geographical distribution of the South-American Anatidae than has yet appeared. Certain necessary changes in the nomenclature have been introduced. As only a small portion of this widely distributed family is treated of here, no attempt has been made to propound any new classifications, but that in ordinary use has been followed. It has not been thought necessary to give descriptions of the species contained in Baird's 'Birds of North America.' II. PRELIMINARY REMARKS ON THE NEOTROPICAL ANATIDA. The Anatidae of the southern portion of the South-American continent differ greatly, both as to genera and species, from the members of the same group of birds found on the northern confines of the Neotropical fauna. The former are most of them peculiar to |