When more than one race of a species occurs in Washington, specimens from localities where the geographic range of one subspecies meets or approaches that of another are listed as "marginal occurrences" in the paragraph on the distribution of the race to which they are best referred. Marginal occurrences are listed from north to south and from west to east. The authority for the record, if published, is given. When the record is based on specimens examined by the author, the collection containing the specimen is indicated as follows: (E.S.B.) Ernest S. Booth collection. College Place, Washington. (J.M.E.) J. M. Edson collection, Bellingham, Washington. (K.U.) University of Kansas, Museum of Natural History, Lawrence, Kansas. (M.V.Z.) Museum of Vertebrate Zoölogy, University of California, Berkeley, California. (U.S.N.M.) United States National Museum, Washington, D. C. Specimens from the Biological Surveys Collection are included here. (V.B.S.) Victor B. Scheffer collection. United States National Museum, Washington, D. C. (W.S.C.) Washington State College, Charles R. Conner Museum, Pullman, Washington. (W.S.M.) Washington State Museum, University of Washington, Seattle, Washington. (W.W.D.) Walter W. Dalquest collection, Seattle, Washington. In all, 230 kinds (species and subspecies) of mammals are listed for the state of Washington. Of these, 9 kinds (opossum, eastern gray squirrel, fox squirrel, 3 kinds of Old World rats, house mouse, nutria, and eastern cottontail) have been introduced into Washington from elsewhere. The dog of the Indians might be listed as a tenth introduced species. The grizzly bear, the sea otter, the wolf, the moose, one race of mountain sheep, one race of mountain goat, and, if they ever occurred in the state, the pronghorn antelope and bison, are nearly or completely extinct in Washington. Mammals other than cetaceans possibly occurring in Washington, but of which satisfactory record is lacking, are mentioned in a hypothetical list at the end of the accounts of species. Of the 220 kinds of native mammals, known to occur in the state, 23 are marine (4 pinnipeds, 19 cetaceans). The 197 living, native, land mammals include 6 orders, 20 families, 58 genera and 101 full species. CHECK LIST OF MAMMALS CLASS MAMMALIA--mammals Order MARSUPALIA--marsupials Family DIDELPHIIDAE--opossums Genus =Didelphis= Linnaeus--opossums _Didelphis virginiana virginiana Kerr_ opossum Order INSECTIVORA--insectivores Family TALPIDAE--moles Genus =Neurotrichus= Gunther--shrew-mole _Neurotrichus gibbsii gibbsii_ (Baird) } _Neurotrichus gibbsii minor_ Dalquest } Gibbs shrew-mole and Burgner }