740 EXPLANATION OF THE PLATES. 
Fig 3—Putorius xanthogenys.—Yellow-cheeked weasel.—No. 536.—San Francisco.— 
Dried) Skins SOMENE 5 s.ce.ce ese enaes dageh consenlos'gensh csi cssbiiens Veviviomssems.esn ema 
a—ear. 
Fig. 4—Putorius cicognanti.—Brown weasel.—Boston 
a—side of head. 
Fig. 5—Putorius frenatus.—Brownsville, Texas.—Half grown ; in alcohol 
a—side of the head. 
Fig. 6—Putorius richardsonii, Bon.—lIllinois 
a—side of the head. 
Fig. 7—Lutra canadensis, Sab.—Otter.—Washington, D. C.—Dried skin softened ; 
(skin of feet toommuchystreteled) sere sercestiesiiesine seisivas ieee saiealenbeseemeabe lena 
a—side of head reduced one-half; b—muzzle from below; c—left fore foot 
from below ; d—left hind foot from below, (half size.) 
Fig. 8—Lutra californica, Gray.—California otter.—Cascade Mountains.—Dried skin 
Sottened, (feet shrivelled!)\isceccrairctetatetcccusessnnenescenecesaeeeseatsen snes temee 
a—muzzle from in front, (nat. size;) b—left fore foot from below ; c—left 
hind foot from below, (half size.) 
ePeeEUERUEE ESOC E SOS S UE E CEOs) 
Peewee eeeeeee 
POO eee Cee TOO E RHEE HEE E HEHE HEHE SEES! SHEET H SESE EEEEe 
PLATE XX. 
Fig. 1—Scturus douglassi, Bach.—No. 1265.—Upper des Chutes, Oregon Territory.-— 
Thay Reto) 10) 3b Bebo no secéissedoon sho buaddoce: idocaqe sak spoosqsdeccpOOsodoeA gob odo. wienenda55 
a—side of the head; /—front view of head ; c—under surface of left fore 
foot ; d—under surface of left hind foot. 
Fig. 2—? Tamias quadrivittatus.—Four-lined squirrel—No. 1266.—Cascade Moun- 
tains, Oregon Territory ; lat. 44°.—Alcoholic specimen............sseeeeeees 
a—side of the head; b—front view of head ; c—under surface of left fore 
foot; d—uwunder surface of left hind foot. 
Fig. 3—Spermophilus lateralis.—No. 1272.—Upper des Chutes.—In alcohol............« 
a—side of the head; —front view of head ; c—under surtace of left fore 
foot ; d—under icties of left hind foot. 
Fig. 4—Aplodontia leporina, Rich.—Sewellel.—No. 966.—Astoria.—Dried sin soft- 
a—front view of the muzzle; b—ear; c—under surface of left fore foot; 
d—under surface of left hind foot. 
Fig. 5—Perognatus penicillatus, Woodhouse.—San Francisco Mountains, N. M 
a—ear ; b—side view of tail, (from mounted specimen.) 
PLATE XXI. 
Fig. 1—Dipodomys ordii, Woodhouse.—Monterey, Mexico.—In alcohol 
a—side view of head ; 6—under surface of head, with the jaw closed, show- 
ing the pouches and the hairy ante-chamber of the mouth ; c—jaws open, 
showing the interior of the mouth and the transverse ridges of the palate ; 
d—under surface of left fore foot ; e—under surface of left hind foot ; 7— 
lateral view of a hind toe and claw. 
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