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Show 1880.] SPECIES O F ANATIDAE. 533 Table II. Distribution of the Anatidae. 1. Anseranatinas . 2. Cereopsinas ... 3. Anserinaa 6. Fulignlinas ... 7. Erismaturinae 8. Merganettinae 9. Merghue I. Arctic. 20 7 18 26 2 '*4 77 II. Ethiopian. "0* 13 1 2 22 III. Indian. "i ii 12 IV. Australian. 1 1 4 1 15 3 3 "i 29 V. Neotropical. "7 2 24 2 2 3 1 41 Total. 1 1 38 10 761 32 9 3 6 176 I will make a few observations on each of these five categories. I. A R C T I C ANATIDAE. The Arctic Anatidae are, as will be seen, by far the most numerous, these birds with their thick covering of feathers and aquatic habits being more naturally adapted to cold and watery climates. Out of the 33 known species of Geese 20, out of the 10 known Swans 7, and of the 31 Sea-Ducks not less than 26 belong to this category. Of the whole number of 176 generally recognized species of Anatidae, 77 may, I think, be best set down as Arctic-although some of them, such as Tadorna rutila, Fuligula rufina, and Marmaronetta angustirostris, cannot be strictly so termed, as they inhabit only the temperate portions of the Palaearctic Region. Very many of the Palaearctic species also, as will be noted below, go far south in winter, and intrude far into the ^Ethiopian, Indian, and Neotropical Regions. The generic forms restricted to the Arctic area are not numerous, except among the Fuligulinae, where out of 11 known genera (as will be seen by the subjoined Table), 8 are not met with elsewhere. Amongst the Anatinae, Aix only is peculiarly Arctic. Table III. Distribution of Fuligulinae. 1. Fuligula 2. Hymenolaemus 3. Clangula 5. Harelda 6. Heniconetta ... 7- Oamptolsemus... 9. Lampronetta ... 10. (Edemia 11. Tachyeres Arctic. 10 3 1 1 1 1 3 1 5 26 Ethiopian. 1 1 Australian. 2 1 •• 3 Neotropical. 1 • • 1 2 Total. 13 1 3 1 1 1 1 3 1 5 1 31 1 Certain species of Anatinas occur in more than one of the regions; so that the total of species is in this case less than the sum of its constituents. 35* |