128 Proceedings of the Biological Society of Washington. 



times inclining toward sepia. Underparts paler; near snuff brown, 

 usually between snuff brown and Saccardo's umber; tail and feet about 

 as in winter. 



Skull. — In general outline suggesting that of Sorex pacificus but much 

 smaller in all dimensions. Compared with that of other (than pacificus) 

 American Sorex rather large; braincase broad and moderately flat; ros- 

 trum medium; interorbital region rather elongate, somewhat depressed; 

 dentition heavy, rather deeply but not extensively pigmented; second 

 unicuspid slightly larger than first, the third much smaller than fourth, 

 which is somewhat smaller than first, the fifth the smallest. 



Measurements. — Type (adult female): Total length, 137; tail vertebrae, 

 59; hind foot, 16. Skull: Type (adult female; teeth slightly worn): 

 Condylobasal length, 20.7; palatal length, 8.3; breadth of cranium 9.7; 

 interorbital breadth, 4.3; maxillary breadth, 5.9; maxillary tooth row 

 (anterior edge of second upper incisor to posterior edge of last upper 

 molar measured at alveolar border), 7.6. 



Remarks. — Specimens of Sorex yaquinae have been examined from 

 Yaquina Bay, Gardiner, Mapleton, and Vida, all localities in Oregon 

 west of the Cascade Mountains and north of the Umpqua River. At 

 Gardiner, Oregon, Sorex yaquinae apparently occurs with Sorex pacifi- 

 cus, specimens of both species having been seen from there. The two 

 shrews, however, in spite of general similarities, seem to be entirely dis- 

 tinct and are easily separated in the material available. On the other 

 hand, although yaquinae occurs with Sorex obscurus bairdi at Vida, 

 Oregon, the differences between these two forms is not so clearly marked 

 and it is possible that additional specimens will show specific affinity 

 between bairdi and yaquinae. 



Sorex obscurus permiliensis, subsp. nov. 



Type, adult male, skin and skull, No. 91,048, U. S. National Museum, 

 Biological Survey Collection, from Permilia Lake, west base of Mount 

 Jefferson, Cascade Range, Oregon; collected October 2, 1897, by J. A. 

 Loring. Original number 4756. 



General characters. — About the size of Sorex obscurus setosus with, on 

 the average, slightly shorter tail ; decidedly more reddish in summer 

 pelage than setosus; skull essentially the size of that of setosus (possibly 

 averaging slightly longer), with broader braincase, unicuspidate teeth 

 (particularly anterior two) somewhat heavier and posterior margins of 

 molariform teeth usually more emarginate. Slightly smaller than Sorex 

 obscurus bairdi, with actually and relatively smaller feet, and rather 

 paler coloration ; skull smaller than that of bairdi, with shorter palate, 

 and decidedly weaker dentition. 



Color. — Winter pelage : Upperparts slightly darker than hair-brown, 

 sometimes approaching chaetura drab, extending, very slightly paler, 

 well down on sides; color of underparts in winter pelage unknown. 

 Summer pelage: Upperparts most nearly between snuff brown and sepia, 

 or slightly more yellowish than olive brown, between Saccardo's umber 



