A new pocket mouse from Wyoming

Vol.

XXIV,

pp. 61-62 March 22, 1911

PROCEEDINGS

OFTHE

BIOLOGICAL SOCIETY OF WASHINGTON

A NEW POCKET MOUSE FROM WYOMING.

BY MERRITT GARY.

Specimens

^of Perognathusⁱⁿ the Biological

Survey

^collection

from Sweetwater Valley and

the

northern edge

^{of the}

Red

Desert,

Wyoming,

represent a well

marked

_palerace, hitherto

undescribed,

of P. fasciatus.,

This pocket mouse may

^be

known from

the following characterization^:

Perognathus

^{fasciatus Iitus} subsp. nov.

Type from Sun, Sweetwater _Valley,

Wyoming.

^No. 160,600, Q _ad., U. S. National

Museum,

Biological Survey Collection. Collected _Sept.

18, 1909, by

M.

_{Cary. Original}No. 1778.

Range.

— Lower

Sweetwater _Valley

and

adjacent parts^of

Red

Desert,

Wyoming.

General Characters.

— A

little smallerthan P. _fasciatus, about thesize

and

proportions^of P. flavescens, butwith slightly larger hind foot than either; colorextremely pale; pelage very^soft.

Color(September specimens).

—

_Upperparts

and

sides palest shade of creambuff, sparsely ^linedwith black-tipped ^hairs, the strong olivaceous tints of fasciatus entirely absent; underparts pure white; orbital ring, auricular _spotsand lateral linepale

cream

_buff; tailindistinctly bicolor, slightlyduskyabove, white below; ^feet white.

Skull.

—

_Asin fasciatus.

Measurements.

—

Type: Total length, 128; ^tailvertebrae, 59; hind_foot,

is.

Que

_topotype: total length, 127; ^tailvertebrae,57; hind _{foot, 18.}

Remarks.

—

This pocket

mouse

isrelated to P. fasciatus ^of the north- ern Great _Plains, with which it agrees closely in ^all respects except color.

The

_{only specimens}

known —

_{two from}

_{Sun and}

_{onefromnear the}

oldLost Soldier Stage Station 40 miles northwest of Rawlins

—

werecol- lectedon sandysage and .[triplex^flats.

A

September specimen from^the North PlatteValley^atCasper^isconsiderably palerthan _{typicalfasciatus} fromtheYellowstone_Valley, Montana, and shows an approach ^tolitus.

16—Proc. Biol.Soc.Wash., Vol.XXIV,^1911. (<il)