CHAP. XVIII.] 
BIRDS. 
291 
Juan Fernandez. As the genera are all enumerated in the table, 
at p. 101 of this volume, I shall here confine myself to the dis- 
tribution of the sub-families, only referring to such genera as are 
of special geographical interest. 
Sub-family I. Conophaginte (2 genera, 13 species). Confined 
to tropical South America, from Brazil and Bolivia to Guiana 
and Columbia. 
Sub-family IX. TiENioPTERiN^E (19 genera, 76 species). This 
group ranges from Patagonia and the Falkland Islands to the 
northern United States ; yet it is almost wholly South American, 
only 2 genera and 4 species passing north of Panama, and none 
inhabiting the West Indian islands. Sayornis has 3 species in 
North America, while Tcenioptera, Cnipolegus , Muscisaxicola, and 
Centrites, range south to Patagonia. 
Sub-family III. Platyrhynichdde (16 genera, 60 species). This 
sub-family is wholly Neotropical and mostly South American, 
only 7 of the genera passing Panama and but 3 reaching Mexico, 
while there are none in the West Indian islands. Only 3 genera 
extend south to the temperate sub-region, and one of these, 
Anceretes, has a species in Juan Fernandez. 
Sub-family IY. Elaineixas (17 genera, 91 species). This sub- 
family is more exclusively tropical, only two genera extending 
south as far as Chili and La Plata, while none enter the Nearctic 
region. No less than 10 of the genera pass north of Panama, 
and one of these, Elainea , which ranges from Chili to Costa Bica 
has several species in the West Indian islands. About one 
fourth of the species of this sub-family are found north of 
Panama. 
Sub-family V. Tyrannic (17 genera, 89 species). This sub- 
family is that which is best represented in the Nearctic region, 
where 6 genera and 24 species occur. Milvulus reaches Texas ; 
Tyr annus and Myiarchus range over all the United States ; 
oil Sayornis, the Eastern States and California ; Contopus extends 
to Canada ; Empidonax ranges all over North America ; and 
Pyrocephalus reaches the Gila Yalley as well as the Galapagos 
Islands. No less than 5 genera of this sub-family occur in the 
West Indian islands. 
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