A new chipmunk from Colorado

1^'! h

Vol. _XXII, pp. 105-106 June _25, 1909

PROCEEDINGS

\ OF THE

BIOLOGICAL SOCIETY OF WASHINGTON

/^

Lu

^L

A NEW CHIPMUNK FROM COLORADO.

^{V^'}

BY EDWARD

R.

WARREN.

In

the

spring

^of

1905

I collected

a

_single

specimen

^of a chip-

munk

at

Gaimie's Ranch,

^Shell

Rock _Canon,

in

the northwest corner

of

Baca County, Colorado, which seemed

to

belong

^to

an undescrihed form. In April

^{of this}

year (1909)

^I

was

success- ful in collecting

two more _specimens

of

the same animal

at

Irwin's Ranch,

ⁱⁿ

Tp. 29

S.,

R. 52 W., ^Las Animas County, Colorado, about twelve miles due west

of

the other

locality.

The

_region

where

these

animals were found

is at

an

elevation of

5,000

^feet

and a

little

more, a sandstone mesa

cut

up by many gulches and shallow canons, and covered with "cedar"

(juniper) and _pinon

_{trees; locally}it is

known

as

"

The Cedars."

It is

a very dry

region,

with

practically

no running ^streams and but few

_springs

and

water-holes.

Evidently

^as

a

result of this

dryness

^{the colors of the}

animal

are

very

pale

and _apparently

faded,

but an examination

of

the

_{pelage of}

the specimens shows

itto

be

practically

unworn, and

as the three at

hand

_{are quite}

identical in color

and other

characteristics I

have no

hesitation in describing ^it as

a

_subspecies of

Eutamias

qtiadrivittatvs, to

which

it is evidently closely ^allied,

though

differing

much

in color.

Eutamias

quadrivittatus

animosus

8ubsp. nov.

LAS

ANIMAS CHIPMUNK.

Tyjye from Irwin's Ranch, Tp. ²⁹S.,R. 52

W.,

^Las

Animas

_County, Colorado(elevation 5,000 feet). No. _3428, collection of E. R. Warren.

9 adult. April29, 1909. E. R.

Warren.

(Thiswill be deposited ⁱⁿ the U. S. National

Museum.

)

Characters.

—

Size as in quadrivittatus, possibly a little larger.

The

animal hasa very pale rustyappearance,

and

the threespecimens ⁱⁿ

my

15—Proc. Biol.Soc.Wash., Vol.XXII.1909. (105)

^'i *<

lOG Warren — _^Nev

ChipTiVHuk

from

^Colorado.

possession areso

much

palerthan alarge series of typical quadrivittatus that there^is

no

comparison ^tobe

made

between them.

Thereare

no

cranial characterstodistinguish^it fromquadrivittatus.

Color.

—

All colors pale. Inner_pair of light stripesgrayish white, outer pair quite^clear white. Middle dark _stripenarrow, blackish, j^ale chest- nutor rufous bordered. Inner_pairof dark _stripes rather pale chestnut rufous, darkestposteriorly,with alittle blackish; outer pair a paleshade ofthe same, not very^distinctfrom the color of thesides, which_{are pale} yellowish ^rufous. Post-auricular _{si:)ot large}

and

whitish.

Top

^{of head}

and

shoulders quite gray.

Dark

facial stripes

narrow and

blackish, not clearlyblack. Flanks_grayish.

Upper

^{surfaceoftailwithless black}

and more

rustythan _{in typical} quadrivittatus,undersurfaceoftailpale bright rufous, notthedarkchestnutofquadrivittatus.

Measurements.

— _Type

_specimen: Total length, 247; ^tail vertebrae, 115;

hind_{foot, 37.}

A male

topotype measures^247; 105; 35.