128 Bailey The American Voles of the Genus fivotomys. 



Evotomys gapperi saturatus Rhoads. 



Evotomys gapperi soiuratus * Rhoads, Proc. Acad. Nat. Sci., Phila., p. 284, 

 October, 1894. 



Type locality. Nelson, B. C., on the Kootenay River, 30 miles north of 

 the Washington line. 



Geographic distribution. The Blue Mountains of Oregon, mountains of 

 northern Idaho, and northward into British Columbia to Cariboo Lake. 



General characters. Larger and longer tailed than E. gapperi, with 

 larger ears and stouter hind feet; spot covering side glands conspicuous 

 in all of the 11 adult males. 



Color. Dorsal stripe bright and rather light reddish chestnut, closely 

 matching that of E. gapperi in specimens from Emsdale, Ontario, and 

 western New York, except that it begins farther behind the eyes ; sides, 

 face, and lower rump dark gray, with less ochraceous wash than in gap 

 peri; belly washed with almost pure white. Sixteen out of the twenty- 

 four specimens from Nelson have a pure white throat patch extending 

 from lower lip nearly to breast. Ears large, protruding well out of fur, 

 slightly rufous-tipped; feet gray; tail indistinctly bicolor, light gray 

 below, dark gray above. 



Cranial characters. Skull, compared with that of gapperi, larger, wider, 

 and more angular ; pterygoids longer and slenderer ; audital bullse slightly 

 larger; premaxillse projecting slightly back of truncate posterior end of 

 the nasals; palatine bones U-shaped, with straight posterior margin; 

 front of upper incisors pale lemon yellow. 



Measurements. Average of 15 adults measured in the flesh by collector : 

 total length, 149; tail vertebrae, 45; hind foot, 18.2. Skull of an average 

 sized adult, No. 66606 : basal length, 22.3 ; nasals, 6.5 ; zygomatic breadth, 

 13.5; mastoid breadth, 11.2; aveolar length of upper molar series, 5. 



General remarks. Mr. S. N. Rhoads described this subspecies from a 

 single specimen caught August 17, 1892, near the town of Nelson. The 

 animal inhabits a large area of country, and, since the original descrip 

 tion gives none of the important characters that distinguish it from 

 neighboring species, the above description has been drawn up from a 

 series of 24 good specimens collected by J. Alden Loring, August 20-28, 

 at Silver King mine, six miles south of Nelson. I have not seen the type 

 of saturatus, but assume the present series to be typical. 



The species is distinguished from E. mazama by a darker dorsal area, 

 shorter tail, more arched skull, straight posterior edge of palate, slen 

 derer, less prominent pterygoids, smaller audital bullse, and paler in 

 cisors. In external characters it resembles E. idahoensis, from which it 

 differs in the broad, angular skull, narrower interpterygoid fossa, and in 

 minor details. With the dark-colored E. occidentalis it needs no com 

 parison. 



*The name saturatus, in suggesting a dark-colored animal, is mislead 

 ing. The species is scarcely darker than gapperi and much lighter colored 

 than obscurus, californiciis, occidentalis, wrangeli, dawsoni, or carolinensis. 



