The mammals included in this list have been reported as occurring in Washtenaw County, but I can find no specimens with authentic data nor descriptions satisfactory for identification, and consider the records doubtful.

Rattus rattus rattus. Black Rat.—Covert[6] states that the species is "very rare. I have but one specimen, which was caught at the Michigan Central R. R. Depot."

Mustela allegheniensis. Least Weasel.—Covert says, "The only specimens of this mammal I have had were brought in this winter" (1881). I have not been able to find these specimens, which were doubtless small females of Mustela noveboracensis.