OCT., 1899.] MAMMALS. 95 



Micro tus montanus (Peale). 



Not obtained on Shasta, but collected at Fall Kiver Lake in August 

 by W. K. Fislier. In August, 1883, seven specimens were (collected in 

 the grassy meadows at Sisson Tavern by C. H. Towusend. 



Microtus mordax (Merriam). Mountain Vole. 



Common in suitable moist places througliout the Canadian and Hud- 

 souian zones, particularly in the heather meadows a little below timber- 

 line, where, though chiefly nocturnal, they were sometimes seen in the 

 daj^time. Their burrows abound in the lieather beds, especially along 

 the overhanging banks of streams, and are so large that some of them 

 were at first mistaken for those of Microti(.s arricoloidcs^ a species which 

 does not occur on Shasta. They were not found in the dry forest. 

 Seventy- four specimens were collected, of which only six were obtained 

 at Wagon Camp. Near Sisson Tavern E. T. Fisher caught fifteen along 

 "the wet and bushy banks of a long ditch." They probably reach 

 Sisson not from Shasta, but from Mount Eddy, in the Scott Mountains, 

 near the foot of which Sisson Tavern is situated. Still, it is possible 

 that the two colonies are connected along some of the few cold streams 

 that traverse the Transition zone slopes of Shasta. 



Evotomys mazama Merriam. Mountain Evotomys. 



Fairly common in moist places in the Shasta fir forests of the Cana- 

 dian zone, where nineteen specimens were obtained. Ten were col- 

 lected in Mud Creek Canyon near the mouth of Clear Creek (altitude 

 6,700 feet); seven along Squaw Creek from 0,700 up to 7,700 feet; one 

 at the head of Panther Creek at 7,700 feet, and one at Wagon Camp at 

 5,700 feet. They were usually caught in traps set under logs in damp 

 or wet i^laces. 



Phenacomys orophilus Merriam. Lemming-Mouse. 



Eare and local, judging from the results of our trapping. Only three 

 specimens were obtained — all in the heather meadows along the upper 

 part of Squaw Creek, where they were caught August 7, 10, and 12 by 

 Walter K. Fisher. 



Thomomys monticola Allen. Sierra Pocket (TOi^her. 



Abundant throughout theboreal slopes of the mountain, from the lower 

 part of the Canadian zone to above timberline. In the dark forests of 

 Shasta firs their mounds were seen wherever there was enough small 

 vegetation to furnish food, and were commonest along the streams and 

 about the edges of marshy idaces, where i)lant life is abundant and luxu- 

 riant. Above the line of continuous timber their mounds were noticed 

 on many of the pumice slopes between the altitudes of 8,000 and 0,000 

 feet. Above the head of Squaw Creek a small colony was found at an 

 altitude of 8,300 feet, and another between 8,900 and 9,000 feet. On 

 the east side of Mud Creek Canyon they were seen at 8,800 feet, and on 

 the west side at 8,900 feet. On our trip around the mountain near 



