402 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
List of specimens. 
THOMOMYS FULVUS. 
Geomys fidvus, Woodhouse, Pr. A. N. Sc. Phil. VI, Dec. 1852, 201.— Ib. Sitgreaves Exp. Zufii and Colorado, 1853,51; 
pi. v. Mammals. 
Pseudosloma (Geomys) fulvus, Aud. and Bach. N. Am. Quad. Ill, 1854, 300. 
Sp. Ch. —Cheek pouches moderately large, well clothed with hair. Tail nearly half as long as the body, thick at base. 
Extremities large. Claws large, not much curved. Third claw of hand 4£ line slong above ; beneath, extending over 
two-sixths the whole hand ; its digits about two-ninths the same length. Claw of the third reaching to two-fifths of the 
hand. 
Color. —Above and on the sides, bright uniform reddish brown ; beneath yellowish white, with a tinge of chestnut on the 
belly. „ Pouches white at the bottom, chestnut around and in the margins, chin dusky. Tail white; dusky above at the 
at the base. 
This species resembles in external appearance the specimen of T. rufescens , from Fort Pierre, 
more closely than any other with which I have compared it; the body being short and stout, 
the feet large, the tail long, &c. The cheek pouches are not large, although it is difficult to 
ascertain this in specimens preserved either dry or in alcohol, owing to the contractility of the 
fibrous tissue. The ear margins are small hut distinct; the tail is thick and nearly half as 
long as the body, well covered with close stiff hairs. The claws are very long on all the feet, 
quite slender, and not much curved. The middle claw of the hand, measured on its lower 
side, occupies about two-fifths of the whole hand, its finger being only about two-thirds this 
length, and little more than half the length of the palm. The tip of the first claw reaches over 
the basal two-fifths of the whole hand ; that of the fifth to beyond the middle and nearly, hut 
not quite, to the base, below, of the third claw. As usual, the first and second hind toes are 
longer, respectively, than the fifth and fourth. 
The prevailing color on the hack and sides is a clear and bright reddish brown; darkened 
slightly along the dorsal region and on top of the head by dusky tips to the hairs. The flanks, 
outside of forearm, tail, and under parts generally, yellowish white ; the abdomen, with a faint 
