Rocky Mountain Marten 201 
Body long and slender; legs short; tail bushy, moderately long; 
soles furred, pads naked ; superior outline of skull somewhat arched ; 
zygomatic arch high; a considerable postorbital constriction; 
bullae quite large; dentition: i. f ; c. |; pm. |; m. ^ X 2 =38. 
The members of this genus are inhabitants of the boreal and 
temperate portions of the northern hemisphere, hving in the 
forested regions. It is really somewhat more widely spread 
than the preceding statement indicates, as in the Old World 
the genus extends from Europe to Java, Sumatra, and 
Borneo; in North America in the east it ranges south to 
northern Pennsylvania, and in the west probably to 
northern New Mexico and to the latitude of San Francisco 
on the Pacific Coast, and everywhere as far north, at least, 
as the forest extends. 
Martens are largely arboreal in habits, preying on small 
mammals, birds and their eggs, and occasionally other 
animals. Those members of the genus living in the colder 
climates are valuable fur-bearing animals, the sable of the 
Old World being a member of the genus, while the pelts of 
the Ame.'-ican martens bring high prices in the fur markets. 
Their outer fur is long and glossy, and there is a thick soft 
under-fur. 
In America six species and five subspecies of what are 
usually called Martens are found, according to Elliot's Check- 
list, besides the large species called the Fisher (Mustela 
canadensis). Of these, one form of Marten is found in 
the mountains of Colorado. There have been rumors of 
the occurrence of the Fisher in this State, but they do not 
seem to have been based on facts. 
Mustela caurina origenes (Lat. caurus, classical name 
of N. W. Wind ; origenes, a mountain race) . Rocky 
Mountain Marten. 
Mustela caurina origenes Rhoads, Proc. Acad. N'at. Sci. Phila., 
p. 458 (1902). 
