out Mammoth Hot Springs.

Golden Ground-squirrel (_Citellus lateralis cinerascens_)
Common.

Picket-pin Ground-squirrel (_Citellus armatus_)
Abundant on all level prairies.

Prairie-dog (_Cynomys ludovicianus_)
Gen. Geo. S. Anderson told me long ago that the
Prairie-dogs, so abundant on the Lower Yellowstone, were
sometimes seen as far up as the Park at Gardiner.

[Illustration: XLVII. Johnnie Bear: his sins and his troubles
_Sketches by E. T. Seton_]

[Illustration: XLVIII. Johnnie happy at last
_Photo by Miss L. Griscom_]

Yellow Woodchuck, Rock Chuck or Marmot (_Marmota flaviventer_)
Abundant on all mountains.

Rocky Mt. Flying Squirrel (_Sciuropterus alpinus_)
Said to be found. I did not see one.

Beaver (_Castor canadensis_)
Abundant and increasing.

Grasshopper Mouse (_Onychomys leucogaster_)
I found a typical colony of this species on the Yellowstone
near Yancey's but did not secure any.

Mountain Deer-mouse (_Peromyscus maniculatus artemisiae_)
Abundant everywhere.

Mountain Rat, Pack-rat or Wood-rat (_Neotoma cinerea_)
Said to be found, but I saw none.

Redbacked Vole or Field-mouse (_Evotomys gapperi galei_)
Not taken yet in the Park but found in all the surrounding
country, therefore, probable.

Common Field-mouse (_Microtus pennsylvannicus modestus_)
Recorded by Vernon Bailey from Lower Geyser Basin in the
Park.

Long-tailed Vole (_Microtus mordax_)
Vernon Bailey records this from various surrounding
localities, also from Tower Falls. Doubtless it is generally
distributed. This is the bobtailed, short-eared, dark gray
mouse that is found making runs in the thick grass,
especially in low places.

Big-footed Vole (_Microtus richardsoni macropus_)
Not yet taken in the Park, but found in surrounding
mountains, therefore probable.

Muskrat (_Fiber zibethicus osoyoosensis_)
Common and of general distribution.

Mole-gopher or Gray Gopher (_Thomomys talpoides_)
A Gopher of some kind abounds in the Park. I assume it to be
this.

Rocky Mt. Jumping Mouse (_Zapus princeps_)
Found in all the surrounding country, and recorded by E. A.
Preble from near Yellowstone Lake.

Yellow-haired Porcupine (_Erethizon epixanthus_)
Somewhat common in the pine woods on the Continental Divide.

Coney, Rock Rabbit, Pika, or Calling Hare (_Ochotona princeps_)