The American Voles of the Genus Evotomys. 133 



Evotomys obscurus Merriani. 



Erofomi/.'^ obsicnrus Merriam, Proc. Bi(jl. Soc. Wash., vol. XI, p. 72, April 

 21,' 1897. 



Ttfpe local it;/. — Prospect, Upper Rogue River Valley, Oregon. 



Geograpliic dktrihution. — West slope of the southern Cascade Range and 

 northern Sierra Nevada in southern Oregon and northern California. 



(leru'i-aJ chardctirs.— \ rather large, grayish species, with small gray ears 

 and indistinct markings ; side glands inconspicuous, but easily discovered 

 on blowing apart the fur. The characters given are mainly those distin- 

 guishing the species from E. viazama. 



Color. — Upper parts olive graj-, with an ill defined dorsal area of cin- 

 namon rufous, obscured b\' black hairs ; lower part of sides and face clear 

 gray ; belly washed with dull buff; ears dusky, not rufous tipped ; feet 

 dusky gray ; tail distinctly bicolor in specimens from the type localit)', 

 more sharply bicolor in specimens from Carberry Ranch, California. 



Cranial characters. — Skull less angular and abruptly sjireading than that 

 of E. )nazama and with a more arched dorsal line; rostrum short, de- 

 curved, with lower outline well arched; incisive foramina short and 

 wide; palatines and audital bulhe as in E. mazama. 



Mramrements. — Type .specimen, measured in the flesh by E. A. Preble: 

 total length, 155; tail vertebne, 47; hind foot, 17. Skull of type: basal 

 length (basion to gnathion), 21.8; zygomatic breadth, 13.3; mastoid 

 breadth, 11.5; alveolar length of molar series, 4.5. 



Remarks. — ^The series of specimens includes both young and adult indi- 

 viduals collected in May, August, September, and December, but appar- 

 ently none in full winter pelage. In both geograi)hic position and specific 

 characters this species lies between E. mazama of the summit of the Cas- 

 cades and E. californicus of the coast region. On the side of Mount 

 Mazama it almost or quite meets the range of ^. viazama, with which 

 none of the specimens show evidence of intergradation. Specimens from 

 Carberry Ranch show a slight approach toward californicus, and future 

 collections may prove ohsctirus to be a lighter-colored, interior form of that 

 species. 



Specimens exami}ied. — Total numljer, 10, from 5 localities: 



Oregon : Prospect, 4 ; west side of Crater Lake, 1 ; Grand Pass, 1 ; 



Siskiyou, 1. 

 California: Carberry Ranch (near INIontgomery Creek), Shasta 

 County, 3. 



Evotomys californicus Merriam. 



Evotomys californicus Merriam, North American Fauna No. 4, p. 26, pi. ii, 

 fig. 2, Oct. 8, 1890. 



Type locality. — Eureka, Humboldt Co., California. 



Geograpliic distribution.— Coast strip of Oregon and northern California. 



General characters. — Oneof the largest, darkest, and longest-tailed species 



in North America. Dorsal area ill defined ; ears small, and in May and 



