RODENTTA 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. 



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. rufescens ? 

 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. 



50 L 



