Vol, IX, pp. 109-116 June21,1894 



PROCEEDINGS ^ 



OF THB /^ ' 



BIOLOGICAL SOCIETY OF WASHINGTON 



PRELIMINARY DESCRIPTIONS OF ELEVEN NEW KAN- 

 GAROO RATS OF THE GENERA UIPODOMYS 

 AND PERODIPUS. 



BY DR. C. HART MERRIAM. 



The following brief descriptions are here pnblished in advance 

 of a monographic revision of the gron^) which will appear shortly. 

 Of the eleven new forms here defined, DijxxJoinys chttor from 

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

 D. III. nitr((tHs from Owens Lake, California; Perodvpus sfreatori 

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

 from the Panamints Mts. in California require no comparison 

 with previously described species. The others are less sharply 

 differentiated. 



Dipodomys elator sp. nov. 



Tvyvc from Henriktta, Clay Co., Texas. No. 64,802 (f ad. U. S.Nat. 

 Maseum, Department of A,2;iiculture Collection. Collected April 13, 1894, 

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



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

 173 ; bind foot 47. Ear from anterior ba.se 14 (in dry skin). 



Average measurements of 2 specimens from type locality : Total length 

 290; tail vertebrai 170 ; hind foot 45.5. 



General characters. — Similar to Dipodomys specUdrUis but con- 

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

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



