APPENDIX. 
219 
THE RED FOX OF THE PLAINS. 
VULPES MACRURUS — Bd. 
Numerous specimens of this species, differing much in color, 
but all apparently referable to the animal described by Baird in 
1852. It runs into many color varieties, as the cross and silver- 
gray, and in one case of which I learned the animal was pure 
black, with a white tip to the tail. One of the specimens in the 
collection is remarkably light-colored. 
THE SWIFT OR KIT FOX. 
Vulpes velox — Say. 
This is a common animal in Colorado, living in burrows on 
the prairie. 
THE GRAY FOX. 
Urocyon cinereo-argentatus — Coues. 
Apparently rare in Colorado. 
Family MUSTELIDXE. 
THE WOLVERENE, OR CARCAJOU. 
Gulo luscus — Sab. 
It is only of late years that the presence of this remarkable 
animal so far south has been known. It ranges chiefly in the 
high north, where it is the most serious annoyance with which 
the trapper has to contend. The specimen in the collection was 
captured with a steel trap near Boulder. The animal resides in 
the mountains, and does not appear to be very rare. 
THE AMERICAN MARTIN OR SABLE. 
Mustela Americana — Turton. 
Though not represented in the collection, I enumerate this 
species as one of the known animals of the State. 
THE LONG-TAILED WEASEL. 
PlJTORIUS LONGICAUDA — Bd. 
Several specimens of this interesting species, believed to be 
perfectly distinct from the common ermine, are contained in the 
collection. These illustrate very fairly the specific distinctions 
from P. er minea, being rather dark-colored, especially on the 
head, with the under parts decidedly tawny, instead of sulphury- 
yellow, abruptly defined against the white of the chin, and the 
black tip of the tail restricted to the terminal pencil. The species 
