_Comparisons._--See account of _S. v. pacificus_ for comparison with that subspecies. Larger and more reddish than _S. v. bairdi_ with which it intergrades to the north and east. Much larger and more reddish than the sympatric _S. v. vagrans_. _Remarks._--The name _yaquinae_ actually applies to a population of intergrades between _pacificus_ and _bairdi_. There is much variation over the range of the subspecies, and individuals from the western and southern parts are larger than those from the west slope of the Cascades. Specimens from Vida and McKenzie Bridge are smaller than those from Mapleton, Mercer, and the type locality but still seem closer to _yaquinae_ than to topotypes of _bairdi_. Between Marshfield and Umpqua on the one hand, and the Columbia River and the Cascade Mountains on the other, the size of _Sorex vagrans_ decreases quite rapidly from the large_ pacificus_ to the smaller _permiliensis_. Size decreases less rapidly northward along the coast than it does eastward toward the mountains; consequently, at any given latitude, coastal shrews are larger than mountain shrews. In this area of rapid change in size it is difficult to draw subspecific boundaries between _pacificus_, _yaquinae_, and _bairdi_, and this must be done somewhat arbitrarily. Jackson (1928:141) remarked upon the possibility that intergradation between _pacificus_ and _yaquinae_ took place. He noted also the close resemblance between _yaquinae_ and _bairdi_, and stated (_loc. cit._) that specific affinity between the two might be demonstrated with more specimens. He had a series of eight specimens from Vida, Oregon, seven of which he assigned to _S. o. bairdi_ and one to _yaquinae_. I have examined these specimens and find no more variation between the largest and the smallest than would be expected in any normally variable series of shrews. Vernon Bailey (1936:364) arranged _yaquinae_ as a subspecies of _pacificus_ without giving his reasons for so doing. _Specimens examined._--Total number, 65. OREGON: _Lincoln Co._: type locality, 2 AW. _Benton Co._: Philomath, 2 BS. _Lane Co._: Mable, 1 OU; Vida, 4 BS, 1 OSC, 3 OU; McKenzie Bridge, 8 OSC, 3 AW, 17 OU, 2 SGJ; Mercer, 1 OSC, 1 OU; Mapleton, 3 BS; Oakridge, 11 OU. _Douglas Co._: Gardiner, 2 BS; Elkhead, 1 BS. _Klamath Co._: Crescent Lake, 3 OU. _Marginal Records._--OREGON: Yaquina Bay; _Philomath_; McKenzie Bridge; Prospect (Jackson, 1928:140); Crescent Lake; Gardiner. =Sorex vagrans bairdi= Merriam _Sorex bairdi_ Merriam, N. Amer. Fauna, 10:77, December 31, 1895. _Sorex obscurus bairdi_, Jackson, Proc. Biol. Soc. Washington, 31:127, November 29, 1918. _Type._--Adult female, skin and skull; No. 17414/24318, U. S. Biol. Surv. Coll.; obtained on August 2, 1889, by T. S. Palmer, from Astoria, Clatsop Co., Oregon. _Range._--Northwestern Oregon, south to Otis and east to Portland.