380 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Remarks. — The above description, based on specimens from the 

 western part of San Diego County, near the Pacific Ocean, in south- 

 ern Cahfornia, reflects the extreme characters of the dark Httoral race 

 of Onychomys torndus which ISIr. Rhoads has named ramona; but 

 Rhoads's description was based on the larger and paler inland form, 

 taken in the San Bernardino Valle}^, California — a region whence he 

 and Dr. Merriam have described several other intergrades between the 

 races of the Colorado Desert and Pacific coast regions, which should 

 not have received names, unless it can be shown that these interme- 

 diates are identical with the forms of the great interior valley of Cali- 

 fornia, an area of sufficient importance to merit recognition as a mam- 

 mal differentiation tract; but, even in this case, the selection of the 

 San Bernardino Valley instead of the San Joaquin Valley as the type 

 locality is unfortunate. In the case of Onychomys torndus ramona, 

 the tyj)e, fortunately, bears a closer resemblance to the coast form 

 than to that of the Colorado Desert, and the name ramona can, there- 

 fore, be api)lied to the Pacific coast form. 



Mi'dsiirement of 13 specimens of Oiu/chonii/s torridu.s nnnuna. 



Museum 

 number. 



63416 

 63415 



1415 

 1414 

 823 



1946 



6.3416 

 63415 



(d) 

 C) 



(d) 

 (d) 



1947 1 (d) 



825 



824 



1242 

 1243 

 1244 



(<i) 

 C) 

 (<*) 



Locality. 



1.367 



1646 

 1629 



740 

 768 

 218 



Date. 



Jacumba Hot Springs, San Diego May 29 

 County, California. 



j 1895. 



Santee Mountains, San Diego County, May 26 

 California. 



do ' May 21 



1893. 



Dulzura, San Diego County, California Sept. 14 



-do Oct. 18 



Apr. 11 



1891. 



Oct. 17 



1893. 



Apr. 10 



1891. 



do Oct. 10 



1894. 



do May 18 



1893. 



do June 28 



do June 20 



do June 26 



San Bernardino Vallev. ralifomia. 



.do 



.do. 



21 

 20 

 18.0 



19.0 



19.0 

 16.9 

 16.0 



o In the collection of the American Museum of Natural History, New York. 



* Mammae, 4 pairs (Holzner). 



(■Collected by F. X. Holzner. 



<* Lent me by Mr. Samuel N. Rhoads; measurements by Mr. Herron. 



« Collected by Chas. H. Marsh. 



/ Type. 



