UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 21, No. 5, pp. 225-238, I text figure May 20, 1920 



A STUDY OF THE CALIFORNIA JUMPING MICE 

 OF THE GENUS ZAPUS 



BY 



A. BEA2;iER HOWELL 



(Contribution from tiie Museum of Vertebrate Zoology of the University of California) 



PREFATORY NOTE 



In attempting to identify certain specimens of Zapusirbm^&aTi-' 

 fornia it became necessary for me to study the whole genus in so far 

 as it is represented within the state. The results of this study con- 

 stitute the present paper. The material used first in making com- 

 parisons consisted of adults selected at random from the series at 

 hand, yet with due regard to locality, season, and condition of pelage. 

 The conclusions reached from examination of this material were then 

 checked and rechecked with the full series. 



The tables of measurements are of properly comparable specimens 

 from as near the type localities of the several forms as possible. All 

 measurements are in millimeters. The names of the colors employed 

 are those used in Ridgway's Color Standards and Color Nomenclature 

 (1912). 



The specimens examined in the present revision are contained 

 chiefly in the collection of the jNIuseum of Vertebrate Zoology of the 

 University of California. In addition, material was borrowed from 

 Donald R. Dickey, D. E. Brown, and the Bureau of Biological Survey 

 of the United States Department of Agriculture. For help rendered 

 during the preparation of this paper, the writer is under obligation 

 to Dr. Joseph Grinnell, Mr. Harry S. Swarth, and Mr. Tracy I. Storer, 

 of the staif of the Museum of Vertebrate Zoologj^ 



