^'*11J Taylor: Mammals of the 1909 Nevada Expedition. 259 



could not be reduced by wear to the conditions shown l^y our 

 specimens. 



No greater discrepancies are presented in skull size and shape 

 than would be expected as a result of individual variation. 



External Measurements* of Thomomys fuscus fisheri From the Pine 

 Forest Mountains, Humboldt County, Nevada. 



For method of taking measurements, see Introduction. 

 All dimensions are in millimeters. 



* In the nature of the ease too much emphasis should not be laid on these 

 measurements, as the examination of larger series might give substantially 

 different results. An examination of the skulls shows no. 7853 to be the 

 youngest specimen the measurements of which are here tabulated. Even 

 this individual is sexually mature, as the uterus contained six fetuses. 



Distribution. — With the exception of the one specimen men- 

 tioned (no. 7853), which was taken at the head of Big Creek at 

 an altitude of 8000 feet, all of our series of six individuals were 

 secured on a meadow on Big Creek (altitude 7000 feet). Ap- 

 parently this is an isolated colony of Fisher pocket gophers. 



Our records result in a considerable extension of the known 

 range of this si^ecies, which will doubtless with further work be 

 found elsewhere in the western part of the Great Basin. Life- 

 zones represented are high Upper Sonoran and Transition. 



Habits. — Old workings, but no fresh ones, were noted on 

 meadows on the west slope of the mountains. Fresh workings 

 were observed at 8500 feet near Duffer Peak, on the meadow in 

 which Leonard Creek heads (8000 feet), and at an elevation of 

 7500 feet on the same stream. A few fresh workings were ob- 

 served in very dry soil under sagebrush near the forks of Big 

 Creek, elevation 5800 feet. Their small size and the character 



