380 



BtrLLETIN 56, UNITED STATES NATIOTSTAL MOSEUM. 



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

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

 ern California, reflects the extreme characters of the dark littoral race 

 of Onychomys torridus which Mr. Rhoads has named ramona; but 

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

 taken in the San Bernardino Valley, 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 torridus ramona, 

 the type, fortunately, bears a closer resemblance to the coast form 

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

 fore, be applied to the Pacific coast form. 



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



'Mammas, 4 pairs CHolzner). 



cColleoted by F. X. Holzner. 



"iLent me by Mr. Samuel N. Rhoads; measurements by Mr. Herron. 



< Collected by Cbas, H. Marsh. 



/ Type. 



