1911] Taylor: Mammals of the 1909 Nevada Expedition. 255 



those of that species and intermedius, resembling the former in 

 coloration, the latter in size. 



Measurements of Microtus (Lagurus) intermedius From the Head of Big 



Creek (Altitude 8000 Ft.), Pine Forest Mountains, 



Humboldt County, Nevada. 



For method of taking measurements, see Introduction. 

 All dimensions are in millimeters. 

 External Cranial 



^ Z-^ 



I >. 1 -r 1 -s^ g as -53 -So .s?s 



5 £ o S ■= C3-S =s S^ £^ SS £"S 



§ CO H H K m I?: N ;^ § K 



7969 ^ 127 26 17 



7973 J' 120 24 18 6.2 13.8 5.4 



7971 ^ 11.5 26 16 5.8 12.3 5.5 



7970 c? 126 30 14 21.9 14.3 12.2 6.2 8.8 



7968 5 27 17 5.7 



7972 $ 117 22 17 20.0 6.4 12.9 11.4 5.8 8.4 

 Average of all 



the adults 121.0 25.8 16.5 20.9 6.0 13.3 11.8 5.7 8.6 



Measurements of Topotypes of Three Species of Microtus (Lagurui.). 



External Cranial 



g Species 



78535 5 Microtus pauperrimus 

 78534 5 Microtus pmiperrimus 

 79917 2 Microtus pauperrimus 

 Average of Microtus 

 pauperrimus 



110803 $ Microtus pallidus 



tnn A-ir r? Microtus curtatus 

 28341$ " 



Average of Microtus 



intermedius 121.0 25.8 16.5 20.0 6.0 13.3 11.8 5.7 8.6 



From curtatus (of which an adult male topotype from Mt. 

 Magruder, Nevada, no. 28341, June 7, 1891, Merriam and Bailey, 

 is at hand) intermedius is differentiated by smaller size, except as 

 regards length of tail; ears not buffy, except in one specimen 

 (no. 7972) ; slightly darker dorsally, this being due to the in- 



