VOL. IX, pp. 109-116 JUNE 21, 1894 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



PRELIMINARY DESCRIPTIONS OF ELEVEN NEW KAN 

 GAROO RATS OF THE GENERA DIPODOMYS 

 AND PERODIPUS. 



BY DR. C. HART MERRIAM. 



The following brief descriptions are here published in advance 

 of a monographic revision of the group which will appear shortly. 

 Of the eleven new forms here defined, Dipodomys elator from 

 northern Texas ; D. drnatus from the state of Zacatecas, Mexico ; 

 D. m. nitratus from Owens Lake, California; Perodipus streatori 

 from the west slope of the Sierra Nevada, and P. panamintinus 

 from the Panamints Mts. in California require no comparison 

 with previously described species. The others are less sharply 

 differentiated. 



Dipodomys elator sp. nov. 



Type from HENRIETTA, CLAY Co., TEXAS. No. 64,802 $ ad. U. S. Nat. 

 Museum, Department of Agriculture Collection. Collected April 13, 1894, 

 by J. Alden Lormg (Original number 1,804). 



Measurements (taken in flesh). Type: Total length 292; tail vertebrae 

 173 ; hind foot 47. Ear from anterior base 14 (in dry skin). 



Average measurements of 2 specimens from type locality : Total length 

 290 ; tail vertebra 170 ; hind foot 45 5. 



General characters. Similar to Dipodomys spectabilis but con 

 siderably smaller, with much smaller ears ; tail more slender and 

 paler, with shorter white pencil ; hind feet relatively longer ; 



