TWO WELL-DEFINED GROUPS OF CARIBOU 89 
and cost in that state seventy-five cents per hundred pounds. 
A full-grown woodland Caribou consumes about seven pounds 
daily. 
Although up to this date nine species of Caribou have been 
described, there are but two well-defined groups, the Wood- 
land and Barren Ground. In each of these, several species 
have been described, but it must be admitted that so effec- 
tually do they run together that it is not always an easy mat- 
ter to distinguish them. 
In common with many members of the Deer Family 
Caribou are distinguished chiefly by their antlers. But even 
here great difficulties are encountered. With their many 
tines and points, varying size and forms of palmation, their 
antlers are subject to thousands of variations. As a result, 
no two pairs are ever found exactly alike. Between the-very 
long, few-pointed and scarcely palmated antlers of the Green- 
land Caribou, and the short, many-pointed and widely pal- 
mated antlers of the mountain Caribou, every conceivable 
form may be found. 
If ten pairs of adult antlers of each so-called species were 
collected in its type locality, and the whole ninety mixed in 
one heap, the utmost that even an expert could hope to ac- 
complish without a heavy percentage of error would be to 
separate the collection into two groups, one containing the 
four species of Barren Ground Caribou, the other the five 
Woodland species. 
It is useless to enter here into details regarding each of 
these nine tentative species. Without a very large collection 
of specimens and a prolonged study of them, it is impossible 
