462 



CALIFORNIA ACADEMY OF SCIENCES. 



Average measurements of Pocket Mice of the Pcrog- 

 nathus spina tus group : 



P . manjariUi' 



P. bryanti 



P. spinatus peninsulai. . 



Intel-grades between 

 spinatus and peninsulai. 



P. spinatus 



Santa Margarita Id., L. Cal 

 San Jose Id., " 



San Jose del Cabo, " 



\n 



Comoudn, 



Colorado Desert, California. 



182 



•214.6 



195 



188 



172 



101 22.5 

 124.6 25.3 



108.6 24 



111.522 

 99 21.4 



p,g 



