1888.1 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 159 



DESCRIPTION OF GEOMYS PERSONATUS AND DIPODOMYS COM- 

 PACTUS, TWO NEW SPECIES OF RODENTS FROM PADRE ISLAND, 

 TEXAS. 



BY FREDERICK W. TRUE. 



In a small collection of dry skins of mammals from Padre Island, 

 Texas, recently purchased by the Museum from Mr. C. K. Wortken, of 

 Warsaw, 111., are three specimens which are apparently the representa- 

 tives of two new species of rodents, belonging respectively to the gen- 

 era Geomys and Dipodomys. For the first of these, I have chosen the 



name of 



geomys personatus. (New species.) 



Description. — Size and proportions of G. bursar ius. Color above, pale 

 pinkish brown, corresponding to the color termed "Broccoli brown," in 

 Mr. liidgway's '• Nomenclature of Colors," with the addition of a little 

 burnt sienna. This color is darkened along the median line of the back, 

 where the tips of the hairs are sepia colored. On the flanks the clear 

 light-brown shades gradually downwards into pure white, which is the 

 sole superficial color of the under surfaces of the body. On the breast, 

 chin, and the inner sides of the legs, and along the median line of the 

 belly the hairs are pure white to the roots, but elsewhere their basal 

 portion is plumbeous. A well-defined dusky baud occupies the space 

 between the eyes and extends thence to the nostrils; but the few hairs 

 immediately beneath the nostrils are white. The hairs on all the feet 

 and on the upper surface of the distal half of the fore-arm and crus are 

 white to the roots, but higher up on the limbs they become plumbeous 

 at the base and light brown toward the tip, like the hairs of the upper 

 surface of the body. The tail is very sparsely clothed with white hairs, 

 the distal half being almost naked. Feet and ears as in G. bursarius. 



The superior incisors are grooved precisely as in G. bursarius.* 



Measurements. (From the collector's notes, except those for the feet.) 



Measurements. 



Length of head and body 



Length of tail 



Height <>f ear (from behind) 

 Length of fore foot (with claws) 



Length of longest claw 



Leugth of hind foot (with claw) 



This species is evidently closely allied to G. bursarius, of which, in- 

 deed, it may eventually prove to be a geographical race. I know of no 



* The cranial characters can not be given at this time, owing to the fact that the 

 -collector neglected to remove the skulls from the skins. To attempt to remove them 

 now would be to sacrifice the skins. 



