282 U)tiversifij of Calif ornia I'tiblicniioiis in Zoology. [Vol. 7 



imderparts is less prominent in tho Warner ^lonntain series than 

 even in oreijonus from Nevada. 



The dimensions of the latter average less than those of the 

 former (see table of measurements). The ratios of tail vertebrae 

 and hind foot to total length vary somewhat between the two, 

 also. For example, the ratio of tail vertebrae to total length in 

 major is slightly less than in oregonus, while the ratio of hind 

 foot to total length is slightly greater. 



External Measurements of Zapus princeps oregonus From the Pine 

 Forest Mountains, Humboldt Ccunty, Nevada. 



For method of taking measurements, see Introduction. 

 All dimensions are in millimeters. 



External Measurements of Zapus major From the Warner Mountains, 

 Modoc County, C^alipornia. 



i Locality ~. ^ -S -Bi^-Boc 



11273 ^ Parker Creek, 5500 ft. 226 137 31 60.6 13.7 



11287 S Parker Creek, 5500 ft. 224 132 30 58.9 13.4 



11274 S Parker Creek, 5500 ft. 226 134 30 59.3 13.3 

 11282 S Parker Creek, 5500 ft. 227 138 30 60.8 13.2 

 11289 $ Parker Creek, 5500 ft. 231 140 32 60.6 13.9 



11288 9 Warren Peak, 8700 ft. 250 150 32 60.0 12.8 

 11286 $ Pinker Creek, 7300 ft. 238 141 30 59.2 12.6 

 11272 ? I'aikcr Creek. 5500 ft. 240 144 30 60.0 12.5 



Average of tlie mah>s 22,'5.7 135.2 30.2 ,59.9 13.4 



Average of the females 239.7 143.7 31.0 .59.9 12.9 



Average of all the adults 232.7 139.5 30.6 59.9 13.1 



