The American Voles of the Genus Evotomys. 137 



the vicinity of Lake Cushman, at the east base of the Olympic Moun 

 tains, show either that the two species meet there or that intergrades 

 occur. A more complete series of specimens is needed to prove inter- 

 gradation, and until such a series is obtained E. nivarius may stand as a 

 full species. 

 Specimens examined. Total number, 6, from three localities. 



Washington : Mt. Ellinor, 3 ; Lake Cushman, 2 ; Skokomish River 

 (10 miles above Lake Cushman), 1. 



[The account of the following species is contributed by Outram Bangs.] 

 " Evotomys proteus sp. nov. 



" Type from Hamilton Inlet, Labrador. No. 4081, 9 old adult, coll. of 

 E. A. and 0. Bangs. Collected Aug. 27, 1895, by C. H. Goldthwaite. 



" General characters. Size largest of the northeastern forms; ear and 

 hind foot large ; colors very variable ; usual coloring of adults yellowish 

 or grayish, with a darker (often sooty) dorsal stripe. Red-backed indi 

 viduals are in a small minority, and even these have the face gray ; feet 

 and tail more hairy than in gapperi or ochraceus; skull large and angular, 

 with deep interorbital constriction, behind which the brain case expands 

 more squarely than in either gapperi or ochraceus, with more strongly 

 marked spur-like process of squamosal. 



" Color. The color of this mouse varies enormously. The type (repre 

 senting the color phase that seems to be most usual) : sides, flanks, cheeks, 

 and face smoke gray, somewhat shaded with yellowish and drab, dark 

 ening on back into a broad dorsal stripe of sepia, and paling off on under 

 parts to light smoke gray ; feet and hands dull gray ; tail indistinctly 

 bicolor, dusky above, dull gray below, hairy. No. 4088 has the whole 

 upper parts, back, and sides dull yellowish, the dorsal stripe slightly 

 darker. No. 4054 has the sides darker yellowish brown and the dorsal 

 stripe bright chestnut, while No. 4139 is slaty all over, slightly paler below, 

 and darker dorsally. Every degree of intermediate coloration can be 

 found between these extremes. 



" Cranial characters. The skull is larger than that of either gapperi or 

 ochraceus, the brain case more angular, the interorbital constriction deeper, 

 and the forward spur-like process of squamosal much more strongly 

 marked. The dentition does not appear to differ materially from that of 

 either gapperi or ochraceus. 



" Measurements (taken in the flesh by collector). The type, 9 old adult : 

 total length, 171 ; tail vertebrae, 53 ; hind foot, 21 ; ear from notch, 17. 

 Average of the 20 largest adult specimens : total length, 161.8 ; tail verte 

 bra, 48.83; hind foot, 20.47; ear from notch, 17.75." 



30 BIOL. Soc. WASH., VOL. XT, IS:7 



