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Published online by Cambridge University Press: 31 May 2012
Ixodes soricis Gregson is known from the type series of adult females, nymphs, and larvae collected by Gregson from long-tailed shrews (Sorex vagrans and S. setosus) in southwestern British Columbia, and from one female collected by Robert Holdenried from Sorex trowbridgii in Marin County, California (Cooley and Kohls, Nat. Inst. Health Bull. No. 184, 1945).