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. rujicauda, 

 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 mugnirostris by D'Orbigny (Syn. Av. p. 5; and Voy. 

 p. 91) proves them to belong to Asturina pucherani as denned 

 in onr synopsis of the genus Asturina (P. Z. S. 1869, p. 133, and 

 Exot. Orn. p. \77, 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. 

 Sclater, M.A., Ph.D., F.R.S., and Osbert Salvin, 

 M.A., F.R.S. 



[Received April 4, 1876.] 

 (Plate XXXIV.) 



Page 



I. Introduction 358 



11. Preliminary remarks on the Neotropical Anatidas 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 18/3 ; and the systematic 

 arrangement of the genera and species of Anatidse adopted in the 



* Nomenclator ' was taken from the MS., which was laid aside un- 

 finished 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 Anatidse 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 classifica- 

 tions, 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 Anatidse. 



The Anatidse of the southern portion of the South-American con- 

 tinent differ greatly, both as to genera and species, from the mem- 

 bers of the same group of birds found on the northern confines of 

 the Neotropical fauna. Tbc former are most of them peculiar to 



