362 NORTH AMERICAN FAUNA [No. 55 



Measurements. Adult topotype : Total length, 125 mm ; tail, 55 ; foot, 15. 

 Type: 130; 57; 15. 



Distribution and habitat. Western Oregon from the mouth of the 

 Columbia southeast to Prospect on the head of Rogue River, Jackson 

 County, in humid Transition Zone (fig. 87). Four specimens not 

 perfectly typical collected by Luther J. Goldman at the north base 

 of Three Sisters Peaks at 6,000 feet, were actually in Canadian Zone, 

 but near the lower edge. At Astoria Palmer found them abundant 

 along the beach under driftwood shaded by alders, as well as under 

 fallen logs in the spruce woods well up on the ridge back of town. 

 At Netarts Jewett collected a series of specimens, and others were 

 taken near Tillamook by Alex. Walker. At Vida and McKenzie 

 Bridge they were found common all through the heavy forest, 

 where they were caught in traps set under old logs and stumps, and 

 in burrows in the mellow woods earth. 



General habits. These large brown shrews have essentially the 

 same habits as their smaller relatives, except that they live in a 

 milder, more humid region with dense vegetation and probably a 

 more abundant food supply. No peculiarity of habits has been 

 noticed. 



SOREX OBSCURUS PERMILIENSIS JACKSON 



CASCADE DUSKY SHREW 



Sorest obscurus permiliensis Jackson, Biol. Soc. Wash. Proc. 31 : 128, 1918. 



Type. Collected at Permilia Lake, west base of Mount Jefferson, Marion 

 County, Oreg., October 2, 1897, by J. Alden Loring. 



General ahwacters. In size slightly larger than typical o'bsourus and 

 smaller than bairdi. In summer pelage scarcely distinguishable from bairdi 

 in color, the upper parts being bright tobacco brown and lower parts but little 

 lighter. In early winter pelage the upper parts darken to sooty brown and 

 the lower parts are slightly more grayish brown. 



Measurements. Type, adult male: Total length, 117 mm; tail, 51; foot, 14. 



Distribution and habitat. Known only from around Mount Jef- 

 ferson and Mount Hood in the northern Cascades of Oregon, mostly 

 in Canadian Zone (fig. 87). At Permilia Lake near the west base of 

 Mount Jefferson Peak in October 189T, Loring took a large series of 

 these shrews, but lower down, near Detroit, he obtained only one 

 specimen from a line of 70 traps set especially for them. 



At Mount Hood in September 1896, 1 specimen was taken on the 

 summit of the Cascades, just south of the base of the mountain and 

 2 more on the west side of the peak near timber line at the head of 

 Sand Creek, localities representing the lower and upper edges of 

 Canadian Zone. These four localities seem to constitute all the 

 existing data on the range of the species, and of habits nothing more 

 is known than what was shown by the dead specimens taken from 

 the traps. 



SOREX OBSCURUS SETOSUS ELLIOT 



OLYMPIC DUSKY SHREW 



Swex setosus Elliot, Field Columb. Mus. Pub. 32, Zool. Ser. 1 : 274, 1890. 



Type. Collected at Happy Lake, Olympic Mountains, Clallam County, Wash., 

 August 18, 1898, by D. G. Elliot. 



General characters. Size slightly larger than typical obscurus, about as in 

 S. o. permiliensis, but colors darker, more nearly seal brown in summer and 



