132 Bailey The Awci'lnm Voles of the Genus Evotovnys. 



farther apart than in E. saturatus ; andital bullae long and laterally ap- 

 pressed ; basioccipital wide between bullse ; incisors pale yellow. 



Measurements. Type, measured in flesh by Dr. C. Hart Merriam : total 

 length, 153; tail vertebrae, 48; hind foot, 20. Average of 4 adults from 

 type locality measured by A. H. Ho well : 148 ; 44 ; 20.2. Skull of type : 

 basal length, 23.5; nasals, 8; zygomatic breadth, 13.3; mastoid breadth, 

 11.6; alveolar length of upper molar series, 5.4. 



Remarks. Three specimens from the Salmon River Mts. differ slightly 

 from the type, but the difference may be individual. Specimens of 

 E. saturates from the Craig Mts., Idaho, and of E. galei from the Bear- 

 tooth Mts., Montana, though geographically near, show no close affinity 

 with E. idahoensis. 



Specimens examined. Total number, 15, from the two folio wing localities : 



Idaho: Sawtooth or Alturas Lake, 12; Salmon River Mts., 3. 



Evotomys mazama Merriam. 



Evotomys mazama Merriam, Proc. Biol. Soc. Wash., vol. XI, p. 71, April 

 21, 1897. 



Type locality. Crater Lake, Mt. Mazama, Oregon; altitude, 7000 feet 

 [2130 meters]. 



Geographic distribution. Crest of the Cascade Mountains in Oregon. 



General characters. Large, long tailed, and bright colored; ears not 

 rufous; skull broad and angular; side glands conspicuous in all of the 

 adult males. 



Color. Dorsal stripe extending from in front of ears to base of tail, cin 

 namon rufous or hazel, shading gradually into buffy gray of sides and 

 face ; belly washed with buffy white ; oval spot covering side glands slaty 

 gray, more or less frosted with white-tipped hairs ; feet grayish white 5 

 tail sharply bicolor, whitish below, blackish above. 



Cranial characters. Skull angular, with unusually flat top, long, straight 

 rostrum, and abruptly spreading zygomata ; audital bullre large ; pterygoids 

 prominent, wide, and inflated at the tips ; palatines rounded anteriorly, 

 with a median posterior projection ; enamel surface of incisors orange. 



Measurements. Average of 4 adult males from type locality measured 

 by Dr. C. Hart Merriam: total length, 157; tail vertebrae, 52; hind foot, 

 18.7. Skull of type : basal length, 23.3; nasals, 7.2; zygomatic breadth , 

 14.2; mastoid breadth, 12.4; alveolar length of upper molar series, 5. 



Remarks. Evotomys mazama differs from E. saturatus in slightly larger 

 size and longer tail ; in yellower, less sharply outlined dorsal stripe ; no 

 tendency to white throat patch ; in more angular skull w : ith larger audital 

 bullaa and pterygoids; in orange instead of pale yellowish enamel of 

 upper incisors, and most conspicuously in form of palatine bones. From 

 the dark colored coast species it differs conspicuously in color, but with 

 E. obscurus it needs careful comparison. 



Specimens examined. Total number, 19, from 2 localities: 

 Oregon : Crater Lake, 16 ; Mount Hood, 3. 



