RODENTIA GEOMYINAE THOMOMYS DOUGLASSII. 



395 



Anteriorly the ashy tint prevails, and there is no visible patch of white as in the last ; what 

 there is of this color being confined to the bottom of the pouch instead of coming up to the edge. 

 The tail is thicker at the base than in the last mentioned species ; the claws are much stouter, 

 larger, and more curved, but the palms themselves are decidedly shorter, with the first and fifth 

 fingers smaller, especially the first ; a similar relation exists in the hind feet, which are shorter, 

 but the claws longer in the present species. The incisors are deeper orange, flatter anteriorly, 

 and the groove sharper and more distinct. 



Measurements. 



No. 452, from Fort Dalles, is much the smallest of the three above referred to, and may 

 possibly belong to another species. It differs in having the hair rather longer, and the under 

 parts considerably lighter. There is no appreciable difference between the colors of the cheek 

 pouches and the region surrounding them. 



Compared with T. umbrinus, this species has a rather shorter tail, stouter claw, but shorter 

 palm, &c. In distribution of coloration, the differences are as much as between it and T. bul- 

 bivorus. 



A gopher, collected by Dr. Newberry, at Canoe creek, California, has the claws of T. 

 douglassii, but the under parts are dirty white ; the feet and tail clearer. This agrees some 

 what with the specimens in the Philadelphia Academy, labelled G. borealis, and brought from 

 Oregon by Townsend. If this be a distinct species, Dr. Newberry's specimen may probably 

 belong to it. 



No. 1962 resembles T. bulbivorus much more in color than T. douglassii. The large and 

 much compressed fore claws, however, belong to the latter species. 



