Recent Ornithological Publications, 273 



3. The South- Brazilian Subregion, containing that part of 

 Brazil lying south of the Amazons-valley and the adjoining 

 countries on the left bank of the Paraguay, down to Uruguay 

 and Monte Video. 



4. The Chileno-Patagonian Subregion, containing Chili, La 

 Plata, and Patagonia. 



These views we believe to be very nearly correct ; for, with 

 some slight modifications, no more natural divisions could, we 

 think, be made for that part of the neotropical region which 

 lies south of the Isthmus of Panama. After this dissertation, 

 Herr von Pelzelu points out at some length the most remarkable 

 peculiarities of the portion of South America explored by Nat- 

 terer, which extended into two only of the above-named Subre- 

 gions, the Amazonian and the South-Brazilian. Both of these 

 districts are rich in numerous and varied forms of the peculiar 

 Neotropical families, Formicariida, Tyrannida, Cotingida, Ram- 

 phastidcs, CracidcB, and Tinamida. The South-Brazilian Sub- 

 fauna is especially characterized by the abundance of Furnariince, 

 Synallaxince, Troglodytina, Fluvicolina, Spermophilince, Cyauo- 

 spizincE, and Coluinbida>, while the Amazonian district, which is 

 principally forest, shows greater richness in Bucconince, Galbu- 

 lince, Coerebince, Dendrocolaptina, Cotingina, and other wood- 

 loving groups. In order to show more clearly the differences 

 between these two faunas, full lists are given of the species ob- 

 served by Natterer in each of them, in parallel columns. In a 

 third column is added a corresponding list of the species ob- 

 served in that part of Brazil denominated by the author the 

 Bolivio-Brazilian district {cf. Ibis, 1869, p. 115), which occu- 

 pies an intermediate position between the two faunas. Herr 

 von Pelzeln then reverts to the six principal subdivisions into 

 which, as already explained in our former notice, he has divided 

 the ground traversed by Natterer, and points out at full length 

 their diversities and similarities. There were only five species 

 of birds of which examples were collected by Natterer in each of 

 these six subdivisions, while as many as twenty species were ob- 

 tained in five out of the six. Complete lists are added of the 

 species obtained by him in each of these districts; and the various 

 faunas are carefully compared with one another. In the South- 



