The American Voles of the Genus Evotomys. 137 



the vicinity of Lake Cushman, at tlie 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. Jiivarivs may stand as a 

 full sjiecies. 

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



Washingfon : Mt. Ellinor, o ; Lake Cushman, 2; Skokomish Eiver 

 (10 miles above Lake Cushman), 1. 



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

 " Evotomys proteus sp. nov. 



" 7)/pe from Hamilton Inlet, Labrador. Xo. 4081, 9 old adult, coll. of 

 E. A. and O. 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 liairy than in gapperi or ochraceus; skull large and angular, 

 with deep interorbital constriction, behind which the brain case expands 

 more sc[uarely 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, liairy. 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 dorsallj'. Every degree of intermediate coloration can be 

 found between these exti'emes. 



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

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

 and the forward spur-like process of squamosal much more stronglj'^ 

 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 vertebne, 53 ; hind foot, 21 ; ear from notch, 17. 

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

 brae, 48.83; hind foot, 20.47; ear from notch, 17-75." 



•30— Biol. Soc. Wash., Vul. .Xr, 1S;)7 



