nus _Pika_, which occurs
also in Eurasia.

The distribution is boreal and the animals live in talus. This broken
rock at the foot of a cliff provides interstices in which the animals
live and store grass and herbs. These plant materials are cut for food
and stacked in piles to dry in the sun, often beneath slabs of rock
which protect the hay-piles from rain. Pikas are diurnal, active
throughout the year, and have a characteristic call, "chickck-chickck."
Young number two to five per litter.

[Illustration: FIGS. 1-4. _Ochotona princeps tutelata_, Greenmonster
Canyon, 8150 feet, No. 38519 MVZ, [MALE], x 1.]

KEY TO NOMINAL SPECIES OF OCHOTONA

1. North of 58[deg] N latitude; underparts creamy white, without buffy
wash; an indistinct grayish "collar" on shoulders
_collaris_, p. 126

1'. South of 58[deg] N latitude; underparts washed with buff; no grayish
"collar" on shoulders
_princeps_, p. 127

=Ochotona collaris= (Nelson)

Collared Pika

1893. _Lagomys collaris_ Nelson, Proc. Biol. Soc. Washington, 8:117,
December 21, type from near head of Tanana River, Alaska.

1897. [_Ochotona_] _collaris_, Trouessart, Catalogus Mammalium ...,
p. 648

_Marginal records._--Alaska: Mt. McKinley (A. H. Howell, 1924:36).
Yukon: head of Coal Creek, Ogilvie Mountains (_ibid._). Mackenzie:
mile 63E on Little Keel River, Canol Road (Anderson, 1947:94).
Yukon: _Macmillan Pass, mile 282, Canol Road_ (_ibid._); Ross River,
mile 96, Canol Road (_ibid._); vic. Teslin Lake (A. H. Howell,
1924:36). British Columbia: Tagish Lake (_ibid._); Stonehouse Creek,
5-1/2 mi. W jct. Stonehouse Creek and Kelsall River (29088 KU). Alaska:
Tanana River (A. H. Howell, 1924:36).

Upper parts Drab to Light Drab; underparts creamy white; grayish
patch on nape and shoulders; skull broad; tympanic bullae large;
total length 189; hind foot, 30.

=Ochotona princeps=

Pika

Total length, 162-216; hind foot, 25-35; weight of _O. p. tulelata_, 6
[MALE] 121 (108-128), 2 [FEMALE] 121 and 129 grams. Upper parts varying
from grayish to Cinnamon-Buff depending on the subspecies; underparts
with wash of buff. Eight Nevadan females had an average of 3.1 (2-4)
embryos. The mode was 3.

OCHOTONA PRINCEPS ALBATA Grinnell.

1912. _Ochotona albatus_ Grinnell, U