Mud-flat, 4. Tall-sedge, 12. Grassy-meadow, 8, Arbor-vitae swamp, 1. Sphagnum bog, 1. Black spruce--tamarack bog, 1. Wet hardwood forest, 2. Dry hardwood forest, 1. Shrub stage, 10. Paper birch--aspen stage, 2. Numerous in suitable habitats in the Cisco Lake Region, at Little Girl's Point, and at Gogebic Lake. Most common in open grasses and sedges. Five of those recorded above from the shrub stage were taken in open shrubs and grass in the clearing around the camp house on Lindsley Lake; and the two recorded from the paper birch--aspen stage were taken at Cisco Lake in an open stand of old paper birch with a forest floor of grass. Juveniles were taken throughout the summer, but no one of seven adult or nearly adult females examined between July 7 and September 4 contained embryos. A captive taken July 18, after feeding ravenously on a cooky, retired to a corner and went to sleep. The position taken in this case was a sitting one, the animal resting on the widely spread feet as far as the heels, and on the tail. The head was bent far over, the nose extending between the hind legs. The long tail was curled around the body, it resting on the ground for its whole length. The operation of cleaning the tail was observed two days later. The animal worked from the base of the tail toward the tip, using the fore feet to present the tail to the mouth, where it was licked off. During the process the head was held over on one side, nearly touching the ground. _Napaeozapus insignis fructectanus._ Woodland Jumping Mouse. Wet hardwood forest, 1. Dry hardwood forest, 6. Three were taken in the Cisco Lake Region and four in the Little Girl's Point Region, all in heavy forest. Neither of two adult females taken August 8 and 10 contained embryos. _Erethizon dorsatum dorsatum._ Porcupine. Forest--shore, 13. Wet hardwood forest, 10. Dry hardwood forest, 17. Shrub stage, 5. Paper birch--aspen stage, 10. Overflow swamp, 5. Edificarian, 1. Common at all camps. Many were taken in traps set for carnivores. Well-marked trails at the edges of lakes and streams through the forests are evidently made mostly by these animals. It is detested by the inhabitants of the region, chiefly for the damage done to any woodwork which contains the least amount of salt. Porcupines spend a considerable amount of time inside hollow linden, yellow birch, and hemlock trees, as shown by the large piles of droppings noted at the lower openings of numerous such hollow trees.