Abstract
0 UR accepted authority for the faunal mapping of southern California is Dr. Grinnell. For northern Lower California there has been no material revision since the lines were drawn by Dr. Nelson after his memorable exploration. Where the mapping of these two authorities meets, on the international line, it at once becomes apparent that there are very considerable inconsistencies in their conclusions. In order to bring harmony between the two maps and with the physical geography of the country, it seems necessary to make some changes, especially with respect to the southern territory. The recognition of two or more new areas is unavoidable, as is a drastic shortening of the southern extensions of both the San Diegan and Colorado Desert areas.
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