80 S. F. Baird on North American Birds. 
constitute a heme barrier. 
to the original peopling of the Indian si Australian regions, @ 
subsidence into the sea and the consequent production of islands, 
while it ultimately modified the minor as of the faune, 
left the prem outlines unchanged. 
American Region. -—Dr. Sclater divides this from 
the South American somewhere in Mexico, the line reaching 
farther north on the coast, and more to the south in the central 
mountainous portion. Wallace draws the line about the parallel 
of 22°, or near the Tropic of Cancer. To the north it includes 
Greenland. 
VI. South American Region.—This embraces, oo to 
Sclater and Wallace, the rest of continental America, the West 
Indies, the Galapagos, the Falklands, etc. while Wallace even — 
includes (very erroneously, however,) the Sandwich Islands. 
Of the regions thus sketched out, I propose to confine myself. 
to the two last mentioned, or those of the new world, and more 
especially the portion included in the United States and north — 
of it, and to point out the minor sr a and peculiarities — 
of the ornithological faunz of the _ Before proceeding 
however to this subject, 1 may pmuaeie ‘that I sick quite agree — 
with Dr. Saline in referring the West Indies to the South © 
— = but prefer to consider it as having indepen- — 
denaie 
VIL. "Wt “Indian. Region—In winter a large Sheth of 7 
North America, — 
the inhabitants of the islands are enusitd from 
but the summer fauna is very distinct. The islands nearest to — 
North and South America have of course an impress of the — 
peenliar to the West Indies, exclusive of the di paved sare a 7 
— a ses proportion ee to Cie. —_ ea ually a 
pecu iar to one tedaland repounnall 
as. Wei per ree etc., . Cuba, _Siphonorhis, Polytm 
Glossiptil, "piste Laletes, etc., to piss Dulus, ete., t 
* Todus Mexicanus of Lesson is a —— species. 
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