Vol. XI, pp. 71-72 April 21, 1897 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



\a^ 



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 

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

 mer, ohtained two undescrihed si)ecies of Evntomys. The first 

 of these was found in tlie 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. niazanvi after the moun- 

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

 species and seems to he very distinct from an}'^ heretofore de- 

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

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

 fornicns. 



The new species may be known irom the following descrip- 

 tions : 



Evotomys mazama sp. nov. 



T[ij>i' from Crater Lake, south end of Cascade Range, Oregon. No. 

 7!»9i;], rj* ad., U. S. Nat. Mus., Biological Survey collection. Altitude 7000 

 feet [21. SO meters]. Collected August 15, 189(i, by C. Hart ^lerriam and 

 Vernon Bailey. Original No. 576o. 



General characters. — Size rather large; tail long for an Erotouiijx; ears 

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

 pale and not well delined. 



O)lor. — Sides of head and body, and head from nose to forehead, jtale 

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

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



10— Biol. Soc. W.\.sh., Vol. XI, 1897 (71) 



