RODENTIA-GEOMYINAE—THOMOJIYS TAlPOIDES. 
403 
rufous tinge. The ears and the edges of the lips are dusky; the edges of the cheek pouches 
like the hack but fainter, their inside whitish. The base of the tail is colored like the hack. 
This specimen was collected by Dr. Woodhouse, in the San Francisco Mountains, and de¬ 
scribed by him in Sitgreaves’ Report. There is no skull accompanying it, but Dr. Woodhouse 
states that it has smooth upper incisors, probably with the usual internal groove. 
Several gophers from San Diego are rather darker than that of Dr. Woodhouse, but differ in 
much the same characters as fulvus from other species. The incisors are more than usually 
grooved ; the tail and claws longer than in T. bulbivorus. 
List of specimens. 
I have thus concluded what is to me a very unsatisfactory account of the gophers with 
smooth incisors, and can only hope that better materials may enable me, or some one else, here¬ 
after to throw more light on the subject. It will be sufficiently evident from an examination of 
the different series of measurements that the comparative length of the tail, as derived from 
skins, is a very uncertain character, since in the entire animal the tail in nearly all the species 
is but little less than half the length of the body. 
I have enumerated all the North American gophers in the preceding pages described by 
authors, with the exception of the Geomys talpoides of Richardson, of which I propose to give a 
brief account taken from the Fauna Boreali Americana, for the purpose of completing the 
account of the genus., 
THOMOMYS TALPOIDES. 
Cricetus talpoides, Rich. Zool. Jour. Ill, Ap. 1828, 518. 
Geomys talpoides, Rich. F. Bor. Amer. I, 1829, 204.— Ib. Rep. British Assoc. Adv. Sc. for 1836, V, 1837, 157. 
(Stated here to come from Florida.) 
Leconte, Pr. A. N. Sc. Phil. VI, 1852, 162. 
Saccophorus talpoides, Fischer, Synop. 1829, 588. 
Ascomys talpoides, Wagner, Suppl. Schreb. Ill, 1843, 390. 
Pseudostoma talpoides, Aud. & Bach. N. Am. Quad. Ill, 1853, 43 ; pi. ex. 
Thomomys talpoides, Giebel, Saugt. 1855, 530. 
Sp. Ch. —Hind foot with only four distinct toes; a fifth very rudimentary. Color, grayish black; chin, throat and tail 
white. 
Unless Dr. Richardson was in error in assigning four toes to the hind feet as the normal 
