PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES Vol. Ill, pp. 265-390, pis. 15, 16 August 28, 1913 A DISTRIBUTIONAL LIST OF THE MAMMALS OF CALIFORNIA BY JOSEPH GRINNELL Director of the California Museum of Vertebrate Zoology The compilation of the following list of the mammals of California has proved well worth while as a help in work with the collections in the California Museum of Vertebrate Zoology. It is believed that its publication now will find justification in its resulting usefulness in other ways — wherever, in fact, a clue to the described species is desired. The literature of the subject is widely scattered, and an index to it, so far as Cali-fornia is concerned, has been practically wanting. The present contribution is intended to meet, in part at least, this need. It must be urged upon the casual enquirer that, at the pres-ent stage in the systematic study of California mammals, the status of the various forms as here given can in scarcely any case be accepted as final. Only a few genera have been given critical study upon the basis of material at all satisfactory. Osgood's Revision of the Mice of the American Genus Pero-myscus (1909) may be cited as the best example of such mono-graphic treatment. Not until each group has been subjected to similar analysis, and especially so with regard to limited areas such as that comprised within the state of California, can the status and distribution of the more slightly differentiated forms be considered as satisfactorily established. In including species and subspecies, the writer has in the great majority of cases followed the conclusions of the original describers. Where genera have been formally revised, the de-August 26, 1913.