In addition to the materials mentioned above we have used published references to mammals of Michoacán and have prepared the following lists of kinds of mammals positively known to us to occur in the Mexican state of Michoacán. It is noteworthy that specimens recorded in the literature from Acámbaro, Michoacán, no longer are to be ascribed to Michoacán, since a relocation of the boundary between the states of Michoacán and Guanajuato, places Acámbaro in the latter state. Our aims were: (1) To record kinds of mammals positively known from the state, under the correct scientific name, and vernacular names in English, Spanish, and Tarascan. The first Tarascan name is given in the spelling used by Tarascans followed by the phonetic equivalent in English in parentheses. (2) To indicate the geographic range of each kind in the state, and, (3) To record miscellaneous information which it is thought probably will be useful in one way or another to other students whose work certainly will lengthen the list of kinds of mammals known from Michoacán and otherwise add to our knowledge of them. Several kinds of bats, of which we lack records, certainly occur in Michoacán. Four or five kinds of cats (genus _Felis_), species of the genera _Potos_, _Lutra_, _Tayra_, _Grison_, and several other kinds of mammals of which we now lack positive record, also probably occur there; the list of kinds, we expect, will number more than one hundred species and subspecies when more intensive collecting has been done in the state. In all, we have positive record of 85 kinds of native, wild mammals of which specimens have been examined or recorded from Michoacán. Distances and elevations here are recorded either in the metric system or in the English system, according to the system used on the labels of the specimens concerned. Unless otherwise indicated, catalogue numbers of more than 100,000 are of specimens in the University of California Museum of Vertebrate Zoölogy and numbers of less than 100,000 are of the Chicago Natural History Museum. [Illustration: FIG. 1. Map of the state of Michoacán showing place names mentioned in the text.] ACCOUNTS OF SPECIES AND SUBSPECIES =Didelphis mesamericana mesamericana= Oken Opossum; Spanish, Tlacuache; Tarascan, Ujkúri (Ukuri) _Did[elphys]. mesamericana_ Oken, Lehrbuch d. Naturgesch., pt. 3, 2:1152, 1816, type from northern México. _Didelphis mesamericana_, Allen, Bull. Amer. Mus. Nat. Hist., 16:256, August 18, 1902. _Range._--Statewide. _Specimens examined_, 7: nos. 100063-100067, 100074, 51396, distributed by localities as follows: Pátzcuaro (3 mi. N, 6,700 ft., 1; 2 mi. W, 6,700 ft., 2; 5 mi. S, 7,800 ft., 1), 4; Tancítaro, 1; 1-3/4 mi. S Tacámbaro, 5,700 ft., 1; 1 mi. E and 6 mi. S Tacámbaro, 1.