SG8 
GEOGRAPHICAL ZOOLOGY. 
[part XV. 
extend into the South Temperate zone, have six families, with one 
peculiar to them ; while the Oriental region, which is wholly 
tropical, possesses the five cosmopolitan families only. 
There are about 78 genera and 552 species of Anseres, giving 
69 species to a family, a high number compared with the 
Waders, and due to there being only one very small family, the 
Colymbidse. The distribution of the Anseres, being more deter- 
mined by temperature than by barriers, the great regions which 
are so well indicated by the genera and families of most other 
orders of birds, hardly limit these, except in the case of the 
genera of Anatidse. 
Order X.—STRUTHIONE& 
Family 126.— STMJTHIONID^I. (2 Genera, 4 Species.) 
General Distribution, 
Neotropical 
Sub-regions. 
Nearctic 
Sub-regions. 
Palaearctic 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
S UB-& egions. 
1 
The Ostriches consist of two genera, sometimes formed into 
distinct families. Struthio (2 sp.) inhabits the desert regions of 
North, East, and South Africa, as well as Arabia and Syria. It 
therefore just enters the Palaearctic region. Rhea (3 sp.) inhabits 
Temperate South America, from Patagonia to the confines of 
Brazil. 
Family 127. — CASU AMID AS. (2 Genera, 11 Species.) 
General Distribution. 
N EOTROPICAL 
Sub-regions. 
Nearctic 
Sub-regions. 
Palaearctic 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
SUB-REGI0N3. 
1 ‘ 
1 1 1 
1 
! 
1 .2 
The Cassowaries and Emeus are confined to the Australian 
region. The Emeus, Dromceus (2 sp.), are found only on the 
