VOL. XII, PP. 85-90 APRIL 30, 1898 



PROCEEDINGS 



OF THK 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF ELEVEN NEW SPECIES AND 

 SUBSPECIES OF VOLES. 



BY VERNON BAILEY. 



The following brief descriptions of new species and subspecies 

 of Microtus are here published in advance of a more extended 

 paper on the group, in which all the known American species 

 are discussed. All of the new forms here described are in the 

 Biological Survey Collection and the private collection of Dr. 

 C. Hart Merriam, both in the U. S. National Museum. 



Microtus dutcheri* sp. nov. 



Type from Big Cotton wood Meadows, near Mt. Whitney, Calif. (10,000 

 ft. alt.). No |f Iff, c? ad., U. S. Nat. Mus., Biological Survey Coll. Col 

 lected July 10, 1891, by B. H. Dutcher. Orig. No. 69. 



General characters. Size rather small ; tail short ; ears small, nearly con 

 cealed by fur ; colors dark above and below ; lips (and usually nose) white ; 

 hip glands present in adult males. 



Color. Summer pelage : Above, dark bister with brown tips to the long 

 hairs ; below, dull cinnamon or buffy-brown ; feet whitish or plumbeous- 

 gray ; tail bicolor, whitish below, brown or blackish above ; lips and usu 

 ally tip of nose white. Winter pelage unknown. Young, dull brown above 

 and scarcely lighter below ; feet and tail blackish ; lips and nose usually 

 white. 



Cranial characters. Skull similar to that of M. montanus, but differing 

 in many details ; rostrum slightly longer ; bullae smaller and less glob 

 ular ; lateral pits of palate shallower ; dentition the same. 



Measurements. Type, $ ad. : Total length 167; tail vertebrae 35 ; hind 

 foot 20. Average of 10 adult specimens from type locality : Total length 



* Named in honor of Dr. B. H. Dutcher, who collected the type series. 



19 BIOT,. Soc. WASH., VOT,. XII, 1898 (85) 



