Occasional Papers of the Museum of Zoology 33 



gave a high-pitched squeak, and the old female replied by a 

 hoarse squeak, evidently of warning, for the young one Vv'as 

 bitten when it approached in defiance of the warning note and 

 threatening attitude of the adult. The baby evidently had been 

 weaned, and the old female was found to contain five large 

 embryos. 



Ondatra zibethica zibethica. ]\Iuskrat. 



Forest — shore, 5- Pondweed, 2. 



Water lily, i. Willow-thicket, signs. 



Muskrats are numerous in the Cisco Lake Region, and five 

 specimens were taken. Near Little Girl's Point one was seen 

 swimming in a small stream. At the mouth of Merriweather 

 Creek on Gogebic Lake signs were noted in a willow thicket, 

 and muskrats were reported numerous in the region. 



An adult female trapped July 6 at Fish-hawk Lake contained 

 six large embryos; another female taken July 10 contained no 

 embryos, but the mammae were filled with milk ; and two 

 females taken July 26 contained no embryos. 



In the Cisco Lake Region broken mussel shells were abun- 

 dant in the muskrat runways along the shores. Remains of 

 pondweeds were also frequently found in the runways, and a 

 quantity of leaves with a few heads containing flowers and 

 seeds collected July 8 were identified by E. A. Bessey as Pota- 

 mogeton richardsonii. 



Zapus hudsonins hudsonius. Jumping-mouse. 



Mud-flat, 4. Black spruce — tamarack bojr, i. 



Tall-sedge, 12. Wet hardwood forest, 2. 



Grassy-meadow, 8. Dry hardwood forest, i. 



Arbor-vitae swamp, i. Shrub stage, 10. 



Sphagnum bog, i. 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 



