1 88 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. XI. 



is "found usually about deserted buildings. Apparently they do not 

 build nests, but live in the rock piles." 



EVOTOMYS. 

 Evotomys obscurus. 



Evotomys obscurus. Merr., Pfoc. Biol. Soc., Wash., 1897, p. 72. 

 Elliot, Syn. N. Am. Mamm., 1901, p. 176. 



One specimen from Grant's Pass, Oregon. 



This is the only representative of this genus in the collection and 

 must be rare on the coast. 



MICROTUS. 



A. MICROTUS. 



Microtus canicaudus. 



Microtus canicaudus. Miller, Proc. Biol. Soc., Wash., 1897, p. 67. 

 Elliot, Syn. N. Am. Mamm., 1901, p. 185. 



Seven specimens: 6, McCoy (topotypes); i, Beaverton, Oregon. 



Microtus californicus. 



Microtus. californicus. (Peale), Mamm. U. S. Expl. Exped., 1848, 

 p. 46. Elliot, Syn. N. Am. Mamm., 1901, p. 186. 



Forty-two examples: 21, Nicasio (topotypes); 5, Point Reyes; 

 n, Petaluma, California; 5, Grant's Pass, Oregon. 



This species in Nicasio, the type locality, is now confined to 

 fenced fields, and roadsides. In other places the cattle, says Mr. 

 Heller, "have stamped out their burrows and driven them away from 

 all the pastures and hillsides." The northern limit of this vole is the 

 Klamath River on the coast. 



Microtus c. constrictus. 



Microtus c. constrictus. Bailey, N. Am. Faun., 1900, No. 17, p. 

 36. Elliot, Syn. N. Am. Mamm., 1901, p. 186. 



Twenty-five examples: 9, Mendocino; 16, Eureka, California. 



The type of this species came from the coast of California near 

 Cape Mendocino, at Capetown (Bailey 1. c.). None of the specimens 

 in this collection came from exactly this locality, but not far away on 

 both the north and south as given above. I have referred them to the 

 present species, but they are so close to M. angusticeps, that it is 

 almost impossible to distinguish them from each other, and I have 

 no topotypes of the present species to assist me. Eureka and 

 Crescent City, the latter the type locality of M. angusticeps, are not 

 a great distance apart, and Eureka is close to Cape Mendocino, the 

 type locality of M. constrictus. These two forms exemplify the great 



