CHAP. XVIII.] 
BIRDS. 
279 
They range over all North America from Panama to the Arctic 
regions, but do not extend far beyond the tropic in Southern 
America. They are almost as abundant in the Nearctic as in 
the Neotropical region ; and considering the favourable condi- 
tions of existence in Tropical America, this fact, in connection 
with their absence from the South Temperate zone would lead us 
to suppose that they originated in North Temperate America, and 
subsequently spread southward into the tropics. This supposi- 
tion is strengthened by the fact that their metropolis, in the 
breeding season, is to the north of the United States. The 
genera adopted by Messrs. Sclater and Salvin are as follows : — ■ 
( 918 ) Siurus (4 sp.), Venezuela and West Indies to Eastern States 
and Canada; Mniotilta (1 sp.), Venezuela, Mexico, and Antilles 
to the Eastern States ; Parula (5 sp.), Brazil to Mexico, and the 
Eastern States, and Canada ; Protonotaria (1 sp.), Antilles to 
Ohio ; Helminthophaga (8 sp.), Columbia to Arctic America 
Kelmintkerus (2 sp.), Central America to Eastern States; Peris- 
soglossa (1 sp.), Antilles and Eastern States ; Dendrmca (33 sp.), 
Amazon to Antilles, and Arctic America, and south to Chili ; 
Oporornis (2 sp.), Guatemala to Eastern States; Geothlypis (11. 
sp.), all North America and Brazil ; Myiodioctes (5 sp.), all North 
America and Columbia ; Basileuterus (22 sp.), Bolivia and Brazil 
to Mexico ; Seiophaga (15 sp.), Brazil to Canada ; Ergaticus (2 
sp.), Guatemala and Mexico ; Cardellina (1 sp.), Guatemala and 
Mexico ; ( 144 °) Granatcllus (3 sp,), Amazon to Mexico ; ( 1441 ) Tere - 
tristis (2 sp.), Cuba ; ( 1439 ) Ickrici (2 sp.), Costa Kica and United 
States to Canada. 
Family 28. — VIBEONIDJE. (7 Genera, 63 Species.) 
General Distribution. 
NEOTROPICAL 
Sub- regions. 
Nearctic 
Sub-regions. 
PAIuE ARCTIC 
Sub-regions. 
Ethiopian 
Sub-regions. 
Oriental 
Sub-regions. 
Australian 
Sub-regions. 
(Messrs. Sclater and Salvin are followed for the Neotropical 
genera ; Professor Baird and Mr. Allen for those of the Nearctic 
region.) 
