MAMMALS FROM THE COAST AND ISLANDS OF 
NORTHERN SOUTH AMERICA. 
BY WILFRED H. OSGOOD. 
While collecting birds for the Field Museum during 1908 and 
1909, Dr. N. Dearborn and the late Mr. John F. Ferry secured a few 
specimens of mammals in northern Venezuela and on several of the 
nearby islands. Most of these are such as chanced to fall to their 
guns, since they carried no traps and made no special effort to obtain 
a representative collection of mammals. The collection, therefore, 
is a small one, but so little mammal collecting has been done in this 
region that many of the specimens are of considerable interest and 
several prove to belong to undescribed forms. The principal localities 
represented are in the districts of Aragua and Zulia, Venezuela, and 
on the islands of Aruba, Curagao, Testigos, and Margarita. 
In reporting on the specimens collected by Messrs. Dearborn and 
Ferry, it has seemed desirable to include descriptions of two new species 
from other sources, but from the same general region. One of these 
is a squirrel from Tobago acquired by the Museum with the Cory 
collection of birds and the other is a deer from Margarita Island, pre- 
sented by Mr. C. Freeman of Puerto Viejo. 
Didelphis marsupialis Linnzus. 
One specimen, Lake Valencia, Venezuela; collected by N. Dear- 
born. This is in very pale, somewhat worn pelage, chiefly whitish, 
but agrees with specimens in similar condition from Guiana repre- 
senting typical marsupialis. 
Tamandua tetradactyla instabilis Allen. 
One specimen, Orope, Zulia; Venezuela; collected by N. Dear- 
born. This is too young to show any subspecific characters, but it 
seems reasonable to refer it to the Colombian form instabilis rather 
than to typical tetradactyla of Brazil. If it were assumed, as has been 
done,* that Guiana is the type locality of tetradactyla, it might be 
safer on geographic grounds to refer our specimen to that form. 
* Allen, The Tamandua Anteaters, Bull. Am. Mus. Nat. Hist., N. Y., XX, p. 391, Oct. 1904. 
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