RODENTIA-GEOMYINAE-THOMOMYS LATICEPS. 
393 
base of the fifth or a little beyond. Hind feet broad and powerful; the claws thick and stout; 
the third reaching furthest; the first longer than the fifth, and the second than the fourth. 
The incisors are light yellow ; quite convex anteriorly ; the inner furrow obsolete, though 
present; all the.incisors unusually thick and stout. 
The ground color of the back and sides, and beneath, is a yellowish brown, tending to reddish 
between the fore legs ; the hairs on the back and top of the head are, however, largely tipped 
with black, less conspicuously on the sides, although this mottling extends to the edge of the 
belly ; the hairs are distinctly yellowish brown within the black tips, and everywhere have lead 
colored bases. The throat, edges of the cheek pouches, and region about the ears, are dusky ; 
the chin, inside of cheek pouches, and feet are grayish white. The tail is dusky above almost 
to the tip ; elsewhere like the feet. 
Measurements of 513. 
Inches. 
Lines. 
Nose to eye_ 
8 
to root of tail_ 
5 
2 
to end of outstretched hind legs_ 
6 
2 
Tail, from root to end of vertebrae............ 
2 
6 
from root to end of hairs__ _ _ _ . 
2 
6 
uncovered portion_ 
1 
11 
Ears, height internally above skull_ 
3 
width__ 
Arm, fore foot to end of claws_ 
HI 
6f 
4 
palm_ 
longest claw_ 
longest toe and claw_ 
6 
Leg hind foot from heel to end of claws_ 
1 
] 
longest claw____ 
2* 
1 
Skull, width. 
1 
This species presents some peculiar points of structure, readily distinguishing it from all 
others examined. The general color is lighter and more yellowish than any except G. rufeseens ? 
and the hairs on the back are broadly tipped with black. The feet and tail are very strong and 
stout; the hand very large in proportion to the claw, &c. 
The skull is of unusual breadth, and the muzzle, with the nasal bones, very short; in these 
respects very different from T. bulbivorus. The hands and feet are larger, while the fore claws 
are of much the same size. The tail considerably longer and stouter. The palms and fingers 
are also larger, but the claws much smaller than in the Steilacoom species. 
List of specimens. 
Catalogue 
Corresponding 
Locality. 
Whence obtained. 
Nature of specimen. 
nhmber. 
No. of skull. 
513 
1648 
Hnmholdt Bay _-_ 
Lt. W. P. Trowbridge, U. S. A-- 
Skin_ 
50 L 
