VOL. XI, PP. 71-72 APRIL 21, 1897 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF TWO NEW RED BACKED MICE 

 (EVOTOMYS} FROM OREGON. 



BY C. HART MERRIAM. 



The field parties of the U. S. Biological Survey, while at work 

 iu the southern part of the Cascade Range in Oregon last sum 

 mer, obtained two undescribed species of Evotomys. The first 

 of these was found in the Hudsonian zone at Crater Lake, on 

 top of Mt. Mazama; the other in the Transition zone of the 

 Rogue River Valley at Prospect, at the west base of Mt. Mazama. 



The Crater Lake animal, named E. mazama after the moun 

 tain on whose summit Crater Lake is situated, is an alpine 

 species and seems to be very distinct from any heretofore de 

 scribed. It was also found by us on Mt. Hood. The affinities 

 of the Rogue River animal seem to be in the direction of E. cali- 

 fornicus. 



The new species may be known from the following descrip 

 tions : 



Evotomys mazama sp. nov. 



Type from Crater Lake, south end of Cascade Range, Oregon. No. 

 79913, $ ad., U. S. Nat. Mus., Biological Survey collection. Altitude 7000 

 feet [2130 meters]. Collected August 15, 1896, by C. Hart Merriam and 

 Vernon Bailey. Original No. 5765. 



General characters. Size rather large; tail long for &n Evotomys; ears 

 medium or rather short ; coloration rather pale ; dorsal area relatively 

 pale and not well denned. 



Color. Sides of head and body, and head from nose to forehead, pale 

 gray or grayish ash ; dorsal area pale dull chestnut, varying to pale rusty ; 

 under parts buffy white, the plumbeous under fur showing through ; 



16-BioL. Soc. WASH., VOL. XI, 1897 (71) 



