The natural division of the subregion is that into an African and a Madagascar province.
Besides the three larger islands numerous satellites belong to the subregion, as Lord Howe, Norfolk and Kermadec islands, with the Chatham, Auckland and Macquarie groups.
So large a portion of the Ethiopian subregion lies between the tropics that no surprise need be expressed at the richness of its fauna relatively to that of the last two subregions we have considered.
The Oriental Subregion comprises all the countries and numerous islands between the Palaearctic and Australian areas; it possesses upwards of seventy families, of which, however, only one is peculiar, but this family, the Eurylaemidae or broadbills, is of great importance since it represents all the Subclamatores.
The Nearctic and the Palaearctic. The reduction of the Oriental to a subregion, with consequent " provincial " rank of its main subdivisions, will probably be objected to, but these are matters of taste and prejudice.