CHAP. X111.] THE AUSTRALIAN REGION. 443; 
For the purpose of zoological comparison, we may class them in 
four main divisions. 1. The Ladrone and Caroline Islands; 
2. New Caledonia and the New Hebrides; 3. The Fiji, Tonga, 
and Samoa Islands; 4. The Society, and Marquesas Islands. 
The typical Polynesian fauna is most developed in the third 
division ; and it will be well to describe this first, and then show 
how the other islands diverge from it, and approximate other 
sub-regions. 
Fyi, Tonga, and Samoa Islands—The land-birds inhabiting 
these islands belong to 41 genera, of which 17 are characteristic 
of the Australian region, and 9 more peculiarly Polynesian. 
The characteristic Australian genera are the following: Petroica 
(Sylviidee) ; Lalage (Campephagide) ; Monarcha, Myiagra, Rhipi- 
dura (Muscicapide); Pachycephala (Pachycephalide); Rectes 
(Laniidz) ; Myzomela, Ptilotis, Anthochera (Meliphagide) ; Ama- 
dina, Eythrura, (Ploceide) ; Artamus (Artamide) ; Lorius (Tri- 
choglossidze) ; Péilopus, Phlogenas (Columbide); Megapodius 
(Megapodiidee). 
The peculiar Polynesian genera are :—Tature, Lamprolia 
(Sylvude) ; <Aplonis, Sturnodes (Sturnide); Todiramphus 
(Alcedinidze) ; Pyrhulopsis, Cyanoramphus, (Platycercide) ; Cori- 
philus (Trichoglosside) ; Didunculus (Didunculide). 
The wide-spread genera are Twrdus, Zosterops, Hirundo, Hal- 
cyon, Collocalia, Hudynamis Cuculus, Ianthenas, Carpophaga, 
Turtur, Halicetus, Astur, Circus, Strix, Asio. The aquatic birds 
are fifteen in number, all wide-spread species except one—a form 
of moor-hen (Gallinulidz), which has been constituted a new 
genus Pareuduastes. 
Society, and Marquesas Islands.—Here, the number of genera of 
land-birds has considerably diminished, amounting only to 16 
in all. The characteristic Australian genera are 5 ;—Monarcha, 
Anthochera, Trichoglossus, Ptilopus, and Phlogenas. The Poly- 
nesian genera are 4;—Tatare, Todiramphus, Cyanoramphus, 
Coriphilus, and one recently described genus, Serresius, an ex- 
traordinary form of large fruit pigeon, here classed under Car- 
pophaga. These remote groups have thus all the character of 
Oceanic islands, even as regards the rest of Polynesia, since they 
