No. 587] 



CALIFORNIA DEER-MICE 



The La J olla race of gambeli seems to fall second in the 

 list in this regard. 



The only significant difference in ear length is that be- 

 tween the two races of gambeli, the La Jolla stock having 

 noticeably longer ears than the Berkeley stock, while 

 rubidus and sonoriensis appear to be intermediate in this 

 respect. 



As regards color differences, these relate chiefly (1) to 

 the depth of shade, and (2) to the extensity of the pig- 

 mented areas. A careful comparison of large numbers 

 of the Berkeley race (gambeli) and the desert race 

 (sonoriensis) revealed at least ten recognizable differ- 

 ences of this class, though in many cases these were 

 merely different expressions of the same fundamental 

 difference. None of the distinctions between these two 

 races are absolute ones, holding between any two individ- 

 uals of the contrasted races. Eather they are distinc- 

 tions "on the whole," expressed by differences of mode 

 or mean. Taken collectively, however, it is likely that 

 these characters form an ensemble sufficiently distinct to 

 reveal the identity of practically every specimen. 



The most widely separate of the races, in respect to 

 color, are rubidus and sonoriensis, the former race being 

 very much darker than the latter. The two lots of 

 gambeli occupy intermediate positions between the others. 



Meteorological Data at Four California Stations. 



