Two new bats from the southwestern United States

V--

Vol. _XXII, pp. 43-44

March

10, 1909

PROCEEDINGS

OFTHE

BIOLOGICAL SOCIETY OF WASHINGTON

TWO NEW BATS FROM THE SOUTHWESTERN UNITED _^

STATES.

BY

N.

HOLLISTER.

In

the Biological

Survey

^{collectionare}

two

undescril)ed species of _Ml/Otis, rein-esented

by specimens from near

_Needles, Cali- fornia,

and

the

mountains

of

New Mexico. Both

are interesting

from

thefact that

they

^exhibit

a tendency toward

^the

crowding out

ofthe

middle upper premolar, an unusual condition

in this

genus. Six out

of the eight skulls

examined

lackthis particular tooth.

The specimens were

^collected

during

^the

course

of field

work

forthe Biological

Survey.

Myotis

^occultussp.nov.

Type from^{west side of} Colorado Rivertenmiles above _Needles, Cali- fornia. No. _137,098U.S. National

Museum,

BiologicalSurveyCollection, c?adult, skin

and

skull.

May

^{14, 1905. N.Hollister.} OriginalNo.2237.

Generalcharacters.

—

_{Nearest to}

_M.

peninsularis but _smaller; forearm shorter; ears smaller; tragus shorterwithblunt_tij). Calcar longerthan freeborderofinterfemoral

membrane, which

^isnearly

naked

;

wing

^from nearbase oftoes.

Color.

— _Back

_rich

glossybrown, ^nearest to Front's

brown

of

Ridgway

butwith a

cinnamon

_tint; face

and

_underparts

much

paler with decided huffycast; ears

and membranes

brown.

Skull.

—

_Nearestto3f.

peninsularisbutsmaller; braincase

much

flatter;

rostrum flat

and

wide. Diflers alsofromallotherNorth

American

_species

ofMyotis^inits low, ^flatbraincase

and

_relativelywide, flatrostrum.

One

ofthe

two

specimens, the type,lacksthemiddle upper premolar^ofMyotis asheretofore diagnosed, leaving the

normal

dentitionofthe_species some-

what

indoubt.

Measurements _oftype.

—

Total length, 9(5; tailvertebrae, 40; foot, 10.5;

tibia, 14;

thumb,

6; tragus, ^6.5. Skull: Condylobasal length, 14.2;

zygomaticbreadth,9.5; breadth of braincase,7.8; interorbital constric- tion, 4; maxillarytoothrow, ^5.9.

5—

Proc.Biol. Soc.Wash.,Vol.XXII,igo9. (4o)

44

Hollister

— _New

_Bats.fromthe Sovthwestern United States.

Bfmarhs.

— _{Only two}

_{specimensof this bat areathand.}

_They

_wereshot

inthedenseCottonwood bottomlands of theColorado River _JNIay14

and

15, 1905.

The

_topotypeispreservedin alcohol.

Myotis

baileyi sp.nov.

Type from ^{base of AVhite} Mountains (7,500 ft.) near _Ruidoso,

New

Mexico. No. _125,787 U. S. National

Museum,

Biological Survey^Collec- tion. 9 adult, in alcohol. September 10, 1902. N. Hollister. Original No. 195.

Generalcharacters.

—

_Nearestto31.veliferbut_smaller; forearm_shorter;

tragus verybroadatbase

and

sharply pointed^; calcarabout_equalto free borderofinterfemoral memljrane,

which

isthinly haired;

wing

^frombase

of toes. Larger than^eitherpeninsularis oroccuUus,with_largerears

and

skull.

Color.

— _Back

_{sepia; underparts}

smoke

_gray; face blackish; ears

and

'

membranes

black.

Shdl.

—

Likethatof31. veliferbut_smaller,withlower,^flatterbraincase.

Compared

^withpeninsularis ^{it is}larger; braincase proportionatelylower with straighter^sides.

Much

_largerthaninoccultus

and

_higherposteriorly.

Fiveoutofthesix

known

specimens, including thetype,lack the middle upper premolar; teeth otherwiseessentially as invelifer.

\

3Ieasurements oftype.

—

_{Forearm,40.3; tibia,17.9; foot,9.1; ear, 14.9;}

tragus, 6.5;

thumb,

^{0.4. Skull:} Condylobasal length, 10.1; zygomatic breadth, 10; breadth of braincase, 7.8; interorbital constriction, 4.1;

maxillarytoothrow, ^6.1.

i^ernar^s.— Besides three specimens from the type locality, only three others have

come

to light; these w^re ^collected

by Vernon

Bailey

and

Clarence Birdseye^atLuna,^GilaNationalForest,

New

Mexico, September 6

and

7, 1908.