PROCEEDINGS

Vol. XXI, ^pp. 143-144 June9,

1908

PROCEEDINGS

OFTHE

BIOLOGICAL SOCIETY OF WASHINGTON

THREE NEW RODENTS FROM COLORADO.

BY

C.

HART MERRIAM.

Merritt Cary, while engaged

^{in a} biological

survey

^{of Colo-}

rado

for the

U.

S. Biological

Survey,

^{collected several}

unde-

scribed species

and

_subspeciesof

mammals. Three

ofthese

—

_a

small chipmunk ^and

^a

gopher from San Luis Valley and

a

wood-

rat

from

the

juniper

foothills of the

southeastern corner

of the State

—

_are

_here

_described.

The chipmunk

^I

am _naming

for Merritt

Cary;

^the

woodrat

for

Edward R. Warren, ^author

^of

an important ^annotated

^{list of the}

Mammals

^of

Colorado and

first collector of the

present form.

Eutamias minimus

_caryi subsp. nov.

Type from

Medano

Hunch, San ^Luis Valley, Colorado. No. _150,740 U. S. National

Museum,

Biological Survey Collection, d" yg. ad.

CollectedOctober24, 1907, by Merritt Cary. OriginalNo. 117*>.

Characters.

—

_Similarto

minium*

_{but paler}

and

_grayer. In fall pelage

(late October)pale gray, most

marked

on neck

and rump, and

^almostas

clearon_{inner pair}of light stripes; outer pair^ofwhite_stripes purerwhite than in minimus; pale^face stripes whitish in striking contrast with the alternating dark _stripes.

Measurements.

—

Type: ^Total length, 194; ^tail vertebrae, 87; hindfoot, 30. Average^{of 10}specimens from type locality: Total length, 194; ^tail vertebra?, 89; hind foot, 30.2.

Neotoma

_aibigula

warreni

subsp. nov.

Type from

Gaumes

_Ranch, northwest corner of

Baca

_County, Colo- rado (alt. 4600 ft.). No. _151,051 U. S. National

Museum,

Biological SurveyCollection, c? ad. Collected

November

_{28, 1907,}

by

Merritt Cary.

Characters.

—

Color gray, ^asin the widely^differentiV.micropus, instead ofbuffyochraceousas in aibigula, to which it is

most

_closely related;

cheeks _gray (in aibigula strongly buffy or yellowish ochraceous); ^tail 20—PROC.Biol. Soc.Wash., Vol.XXI, ^1908. (143)

144 Merriam —

_Three

_{New Rodents from}

_Colorado.

black above

and

_sharplytricoloras in albigula; ^feet white as in albigula.

Skull _peculiar.

Cranial characters.

—

_Skull,

_compared

with _albigula, shorter

and

broader; rostrum

much more

swollen _laterally; nasalsbroader

and more

squarely truncateanteriorly, longer (along

median

_line) than frontal (in albigula subequal with ^{frontal); frontal} shorter; frontomaxillary suture (at anterior root of

zygoma)

^{straight (in} albigula angular); zygomata heavier

and somewhat more

_spreading; bullaesmaller

and more

_rounded;

molarsheavier (broader).

Measurements.

— _Type

_specimen, male: Total length, 324;^tail vertebra?, 137; hind _foot, 36.

An

adult female from _{type locality:} Total length, 330; tail, 14<>; hind foot, ^:;4.

Thomomys

talpoides agrestis subsp.

now

Type from

Medano

Ranch, San Luis Valley, Colorado. No. _150,725 U. S. National

Museum,

BiologicalSurveyCollection. 9 ^{ad. Collected} October29, 1*>07,

by

Merritt Cary. Original No. 1205.

Characters.

—

Sizeand general characters

much

as in talpoidesbut color very ^different

—

_paledrabas in ocius insteadofdark

brown

as in talpoides;

skull also different.

Color.

—

Upperparts uniform drab, sometimeswith a pale reddish ^(dull ochraceous) ^caston_topof head

and

_neck;ear spots conspicuouslydusky^; underparts ^soiled whitish, the

plumbeous

underfur showingthrough.

Cranial characters.

—

Skull similar to that of talpoides but averaging longer

and

narrower; zygomata ^less spreading; nasals less regular, ^less truncate posteriorly, ^less straight on outer side

—

_{tending to}

spread out-

ward

on posterior third; premaxillse longer and broader posteriorly;

maxillary ^rootof zygomata ^longerand broader

and

swollen to articula- tionwithjugal so thatthe_jugal part^ofarchisabruptly

and

conspicuously narrower; bullae slightly

more

swollen.

Measurements.

—

_Type: Total _length, 220; ^tailvertebra?, 57; hind _foot, 30. Average ^{of 4 females} from _{type locality:} Total _length, 212; ^tail vertebra³, 55; hind_foot, 29.