128 Bailey — The American Vole i^ of the Genus Evotowy^. 



Evotomys gapperi satuiatus Rlioads. 



Erotnini/!^ gapjieri ffdittralitx* Rhoads, Proc. Acad. Nat. Sci., Phila., p. 284, 

 October, 1804. 



Ty2}e locuUti/. — Nelson, B. C, on the Ivootenay River, 30 miles north of 

 the Washington line. 



G('(igiaj)]ilc distrihiilion. — Tiie Blue ^Mountains of Oregon, mountains of 

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



General characters. — Larger and longer tailed than is', 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 rumj) dark gray, with less ochraceous wash than in gap- 

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

 four specimens from Nelson have a pure white throat patch extending 

 from lower lip nearly to breast. Eai's large, ijrotruding well out of fur, 

 slightly rufous-ti])ped ; feet gray; tail indi.stinctiy bicolor, light gray 

 below, dark gi'ay above. 



Cranial characlers. — Skull, compared with that oi gapperi, larger, wider, 

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

 larger; prema.\ill;e projecting slightly back of truncate posterior end of 

 tile nasals; ])alatine bones U-shaped, with straight posterior margin; 

 front of u})per incisors pale lemon yellow. 



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

 total length, 149; tail vertel)r;e, 45; hind foot, 18.2. Skullof an average 

 sized adult. No. (j(j()0(j : basal length, 22.;] ; nasals, (5.5 ; zygomatic breadth, 

 13.5 ; mastoid breadth, n.2 ; aveolar length of upper molar series, 5. 



General remarks. — Mr. 8. N. Rhoads described this sul)species from a 

 single specimen caught August 17, 1802, 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 si)ecies, 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 bulUe, and paler in- 

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

 differs in the l)road, angular skull, narrower interpterygoid fossa, and in 

 minor details. With tlie dai'k-coloi'ed 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, californicus, occidentalis, wrangeli, dawsoni, or carolitiensis. 



