384 



FRANCIS B. SUMNER 



The map of California (fig. 1) shows the position of the eight 

 stations at which my most extensive collections have been 

 made. Two of these stations (La Jolla and Berkeley) were chosen 

 largely as matters of convenience, but the other points were 



Fig. 1 Map of California, showing the eight stations at which representative 

 collections of mice have been trapped. 



selected with reference to definite geographical and biological 

 conditions. Mice of the species under consideration (Pero- 

 myscus maniculatus) inhabiting four of these stations (Eureka, 

 Carlotta, Fort Bragg, Duncan Mills) have been assigned by 



