1957) reported that he has seen
muskrat tracks many times along the Mancos River. He also relates a
report received from Chief Ranger Wade and D.A. Spencer who saw a
muskrat, no doubt a wanderer, on the Knife Edge Road on a cold winter
night. These men, both reliable observers, stopped and saw the muskrat
at a distance of two feet, where it took shelter under a power shovel
parked beside the road. Reports of dens seen along the Mancos River are
available for 1944, 1945, 1946, and 1947.

Microtus longicaudus mordax (Merriam) Long-tailed Vole

_Specimens examined._--Total, 36: North end Mesa Verde National
Park, 7000 ft., 76233-76237; entrance to Mesa Verde National Park,
5123-5126 in Denver Museum; Prater Canyon, 7600 ft., 76238-76244;
Upper Well, Prater Canyon, 7575 ft., 69441; Morfield Canyon, 7600
ft., 76245-76259, 76261-76263; west bank Mancos River, northeast
side Mesa Verde National Park, 76260.

The vegetation at the above-named localities is a combination of brush
and grasses that are both more luxuriant than in areas dominated by
pinyon and juniper on the more southern and altitudinally lower part of
the top of the Mesa where no _M. longicaudus_ was taken.

Microtus mexicanus mogollonensis (Mearns) Mexican Vole

_Specimens examined._--Total, 22: Prater Canyon, 7600 ft.,
76283-76287; Sect. 27, head of east fork of Navajo Canyon, 7900
ft., 69442; Far View Ruins, 7700 ft., 69443, 79223-79224; 2 mi. NNW
Rock Springs, 7900 ft., 69444-69446; Park Well, 7450 ft.,
69447-69453; rock ledge at head of Spruce Tree Canyon, unnumbered
specimen in Denver Museum; Headquarters, MV 7895/507, 7896/507.

The first specimen of the Mexican vole from Colorado was obtained on the
Mesa Verde and has been reported by Rodeck and Anderson (1956:436).
Specimens have now been taken at seven localities on the Mesa. Prater
Canyon is the only one of these localities at which any other species of
vole was taken. There _Microtus longicaudus_ and _Microtus montanus_
were also obtained. Judging from the vegetation at the above localities,
_M. mexicanus_ is to be expected in drier areas with less cover than _M.
montanus_ inhabits, and in areas having less cover than those inhabited
by _M. longicaudus_.

Microtus montanus fusus Hall Montane Vole

_Specimens examined._--Total, 16: Upper Well, 7575 ft.,
69454-69465; 1/4 mi. N Middle Well, 7500 ft., 69466-69469.

The v