.•JO'2 MICROTUS. 



Microhis oregoni Elliot, Syn. N. Am. Mamm., F. C. M. Pub., ii, 

 1901, p. 200, fig. 42. Zool. Ser. Id. Check-L. Mamm. N. 

 Amer. Cont. & W. Indies, F. C. M. Pub., vi, 1905, p. 250. 

 Zool. Ser. 

 Oregon Meadow Vole. 



1-6. Adult c? Coll. Eureka, California. E. Heller. 

 7-10. Adult 9 Coll. Eureka, California. E. Heller. 

 II. Adult c? Coll. Mendocino, California. E. Heller. 

 12-13. Adult ? Coll. Requa, California, E. Heller. 

 14-17. Adult d^ Coll. Beavertown, Oregon. E. Heller. 

 18-21. Adult c? Coll. Goldbeach, Oregon. E. Heller. 

 22. Adult 2 Coll. Goldbeach, Oregon. E. Heller. 

 23-25. Adult cJ' Coll. Happy Lake, Olympic Mts., Clallam County, 



Washington, D. G. Elliot. 

 26-33. Adult 9 Coll. Happy Lake, Olympic Mts., Clallam County, 



Washington. D. G. Elliot. 

 34-37. Adult cj^ Coll. Johnson's Ranch, Elwah River, Clallam 

 County, Washington. D. G. ElHot. 



506, Microtus serpens Merriam. 



Microtus serpens Merr., P'roc. Biol. Soc. Wash., 1897, P- 75- Elliot, 

 Syn. N. Am. Mamm., F. C. M. Pub., it, i9oi,p. 200. Zool. 

 Ser. Id. Check-L, Mamm. N. Amer. Cont. & W. Indies, F. C. 

 M. Pub., VI, 1905, p. 250. Zool. Ser. 

 Creeping Meadow Vole. 



1-2. Adult c? Exch. Sumas, British Columbia, Canada. U. S. 

 Nat. Mus. C. K. Worthern. 



Subgenus F. Arvicola. 



507. Microtus schermaus F. Cuvier, 



Microtus schermaus F. Cuv., Diet. Scien. Natur., vi, 1817, p. 281. 

 Schermaus Vole. 



1-5. Adult 6^ P. Meiringen, Switzerland. J. A. Loring. 



6-9. Adult 9 P. Meiringen, Switzerland. J. A. Loring. 



(I. Microtus richardsoni arvicoloidcH (Rhoads). 



Aulacomys amicoloides Rhoads, Amer. Nat., xxviii, 1894, p. 182. 

 Microtus principalis Rhoads, Amer, Nat., xxix, 1895, P- 940- 

 Microtus richardsoni arvicoloides Elliot, Syn, N. Am, Mamm., F. 



C. M. Pub., Ti, 1901, p. 202. Zool. Ser. Id. Check-L. Mamm. 



N. Amer. Cont. & W. Indies, F. C. M. Pub., vi, 1905, p. 251. 



Zool. Ser. 



