ECOLOGY OF NORTHERN MICHIGAN. 129 



was taken July 28 (No. 32139). This is a very dark "specimen when com- 

 pared with the^ normal form found at Ann Arbor, Mich. The long over 

 hair, especially on the top of the head, the rear of the back and the tail, is 

 very dark brown or black. The pale under fur is also darker than in normal 

 specimens. The hair on the lower parts of the body is much more rufous 

 and darker than in the normal form. II. 3. In the camp clearing, an adult 

 and one young of the normal color were seen. 



6. Sciuropterus sabrinus (Shaw). Northern_^ Flying Squirrel. "J II. 2. 

 Two adult females were taken in the hardwood forest, August 3 and 4. III. 

 5. In the aspen zone near the mountain top, an adult female was taken 

 July 29. 



y' 7. Castor canadensis Kuhl. American Beaver. IV. 1. Old beaver 

 dams were observed on Carp river, and relatively fresh ones on Little Carp 

 river, VII. 3, by Ruthven. Mr. David Ahie, of the Carp Lake Mine, reported 

 that the last beaver taken on Carp river was about 1898. VII. 3. No fresh 

 signs of beaver were observed on Little Carp river. Allie reported them 

 to occur on the river below Little Carp Lake. Beaver cuttings were secured 

 from the dams on Carp and Little Carp rivers. 



8. Peromyscus canadensis (Miller). Canadian White-footed Mouse. 11. 

 2. Four males taken August 3, 11, and 13, were referred to canadensis by 

 the U. S. Biological Survey. Two males taken August 8 (No. 32193) and 

 August 6 (No. 32197), and an immature male taken July 24 (No. 32198), 

 apparently belong here. This was one of the most common mammals in 

 the mountains. 



9. EvQtomys gapperi (Vigors). Common Red-backed Mouse. II, 2. 

 Two males were taken in the hardwood forest, August 3 and 13. III. 5. 

 Two pair of adults were taken in the aspen zone bordering the mountain top 

 between July 22 and 30. IV. 4. Two adult females were taken August 6 and 

 7, in the tamarack swamp. 



In the Porcupines this mouse is thus seen to frequent a variety of habitats, 

 the hardwood forest, the aspen zone, and the tamarack swamp. Farther 

 south it is more closely restricted to cool swamps. 



10. Fiber zibethicus (Linn.). Muskrat. IV. A few specimens were seen 

 along Carp river, July 16, by Maclean and McCreary. VII. 1. One specimen 

 was shot at Little Carp Lake, August 7, by Peet. 



11. Zapus hudsonius (Zimm.). Northern Jumping. Mouse. II. 2. An 

 immature male was taken, July 30, in the hardwood forest. VII. 1. An 

 immature male was taken on a rocky bluff along Little Carp river, August 11. 



12. Napceozapus insignis (Miller). Woodland Jumping Mouse. II. 

 2. Three adult males were taken in the hardwoods, between August 4 and 13. 



13. Erethizon dorsatum (Linn.). Canadian Porcupine. II. 2. An adult 

 female and a pair of young were taken in the hardwood forest between July 

 23 and August 8. An adult male was shot, July 13, in the hardwood forest 

 near the base of the mountain slope. II. 3. Three females were taken, 

 during July, in the camp clearing. IV. 1, and V. 1. Porcupines were fre- 

 quently seen, by Ruthven, in the river and lake both during the day and 



.night, eating leaves of the yellow water Hly. (This habit is shown in Fig. 19). 

 This interesting animal was very abundant and of general distribution 

 in the forest. 



14. Lepus americanus virginianus (Harlan). Southern Varying Hare. 

 II. 3. An adult female was taken, August 9, in the camp clearing. It had 

 evidently been suckling young and was in full summer pelage. The yellow- 

 ish rufous pelage is much more marked than in the Hares from Isle Royale 



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