Ne eae a ee Pe ee eee Poe eae eae Sn eee cee S 
1894.) Zoology. 185 
_ Skull—Basilar length 29; total length (occipito-nasal) 31; zygo- 
matic breadth 19; nasal length 9; interorbital constriction 5; inter- 
parietal breadth 7; interparietal length 4.9; crown length of molar 
series 7.4; greatest depth of cranium 10.9; length of mandible 20; 
height of coronoid process 11; ratio of zygomatic breadth to basilar 
length 65.5; zygomatic breadth to occipito-nasal length 58. 
The specimen on which the foregoing characters are based was taken 
near Snoqualmie Pass on the Cascade Mountains. Out of a large 
series of rodents from this district it is the only specimen of its sub- 
family. It arrived in the form of a flat skin, reversed, with the skull 
separate and intact—SamuEL N. RHOADS. 
Description of a New Perognathus collected by J. K. 
Townsend in 1834. PEROGNATHUS LATIROSTRIS. Sp. Nov.—Type, 
No. 694, ad $, Col. of Acad. Nat. Sci. of Phila. ; “ Rocky Mountains, 
J. K. Townsend ;” Summer, 1834.) 
Description—(mounted specimen, lacking tail, once preserved in 
Spirits)—Largest known species of the genus. Upper half of head 
and body to root of tail, brownish-yellow, 
interspersed medially with black, spinous 
hairs, becoming purer brown on sides and 
bordered laterally from base of nose to tail 
with a broad ill-defined line of pure ful- 
vous. No black tips to brown hairs of 
- back, all hairs being unicolor from root to 
tip; black hairs coarsest. Pelage long and 
coarse throughout. Whiskers, . slender, 
sparse, the longest reaching far behind the 
ears. Lower parts, feet, forelegs to shoul- 
der, and inside of hind legs, dirty white. 
Ears pronounced, rounded, rather sparsely 
haired, with marked antitragus not higher 
than broad at base. Hind ears and spot over 
Perognathus latirostris, Type. eyes fulyous. Hairs of base of tail same 
; ealan aien a as under parts all round point of frac- 
ture, seeming to indicate a unicolor tail. Soles hairless along median 
line to heel. Cheek pouches very large, external opening of same 
Stretching from upper incisors half way to forelegs. 
Skull—(occipital and postero-mastoid region absent) ; cranium deep, 
slightly arched, as viewed from above, subrectangular ; rostral portion 
very wide; interparietal bluntly mucronate anteriorly; coronoid pro- 
