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Show 536 ON T H E SPECIES O F ANATIDAE. [June 15, V. N E O T R O P I C A L ANATIDAE. The Neotropical Region is better supplied with Anatidae than any other of the divisions here adopted except the Arctic, 39 species being specially attributable to it. Besides these, as Mr. Salvin and I have shown in our article on the Neotropical Anatidae, published in the Society's 'Proceedings' for 18761, 23 of the Arctic Anatidae are more or less regular visitants to it during the winter season. The generic types of Anatidae restricted to the Neotropical area are 5, namely, Cairina, Heteronetta, Metopiana, Tachyeres, and Merganetta. There are, however, only 7 species belonging to these peculiar genera; so that the mass of the Neotropical Anatidae belong to Arctic genera. On the whole, the Neotropical Anatifauna (if such an expression is allowable) is not more peculiar than that of Australia, where there are also 5 special generic types not found elsewhere. In true Anatidae the Neotropical Region is specially rich, possessing 23 species against the Arctic 18, as will be seen better by the subjoined Table. Table IV. Distribution q/Anatinae. Genus. 5. Stictonetta 6. Aix 7. Mareca 8. Dafila 9. Anas 11. Heteronetta 12. Marmaronetta ... 15. Spatula 16. Malacorhynchus... 17. Metopiana Arctic. 2 "i 2 1 2 1 i 6 1 18 Ethiopian. 3 1 "i" Y 4 2 1 13 Indian. 4 1 1 4 i n Australian. 2 3 1 5 1 2 1 15 Neotropical. 5 1 1 T 2 2 i 8* 1 i" 23 Total. IO2 3 1 7 1 2 3 4 162 2 1 1 1 16 5 1 715 In Fuligulinae, on the other hand, it is very poor (see Table III. p. 533), having only 1 species against the Arctic 26. 'Kevision of the Neotropical Anatidae," P.Z. S. 1876, p. 358. In these genera some of the species occur in more regions than one, so that the total is not equal to the sum of the constituents. I <i • a |