This is our largest squirrel, furnishing sport and food for hunters. One albino taken in the county is in the collection of the Museum of Zoology; and one partly melanistic individual, taken near Ann Arbor, November 12, 1910, has the whole underside jet black. The call is hoarser than that of the gray squirrel, but although not so high in pitch may be heard for some distance. It occasionally swims; I know of one which swam across a part of Portage Lake, one-half mile, on a hot summer day, about 1910. _Glaucomys volans volans._ Southern Flying Squirrel.--This species may still be found in some numbers in suitable habitats in the county. They are usually found in woods, although I have found them in houses both in Ann Arbor and at Portage Lake. They nest and live in tree cavities, and in winter are gregarious. In late December, about 1890, in Lodi Township I found 20 or more in a hollow butternut stub. The call is a high, bird-like chirp or long squeak, which I have often heard from the tree tops while in the woods on moonlight nights. _Castor canadensis michiganensis._ Woods Beaver.--The first settlers of this county found this species to be nearly extinct, although dams and old beaver meadows were very common. It probably became scarce about 1800. Hon. Henry S. Dean, of Ann Arbor, told me that in 1837 at "Gravel Run," a few miles north of Ann Arbor, he saw a dam in good shape, although not used at that time. Remains of other dams still exist. S. D. Allen, of Ann Arbor, told me that in 1835 he saw a live beaver in the Huron River near Ypsilanti. This is the last record for the county. _Lepus americanus americanus._ Snowshoe Hare.--This hare was formerly common over all the southern peninsula of Michigan. In Washtenaw County it persisted for a long time in the tamarack bogs, but when these were mostly drained or destroyed the hares became extinct. It was last taken in Steere's Swamp, four miles south of Ann Arbor, in 1875. One was taken in a swamp near Whitmore Lake in 1890. L. D. Watkins, of Manchester, reports shooting one in a large swamp near Pleasant Lake in the fall of 1907. _Sylvilagus floridanus mearnsii._ Mearns Cottontail.--The cottontail was formerly common only in the southern part of Michigan, but it now occurs over all the cultivated area of the Lower Peninsula. It has increased with and followed the civilization that furnished an abundance of food and destroyed many of its enemies.