500 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Mexican Boundary. Everywhere In the shade of rank growths of cat- 

 tail, sedge, and rush, beside the stream, we could see their much- 

 trodden paths; lait the little beasts were so difficult to trap that we 

 only obtained three of them, all caught in daytime. A female taken 

 by Mr. Holzner on June 27 contained four fetuses. 



Note. — The following species of voles are slightly extralimital, not 

 being known to occur south of the Southern Pacific Railroad: 



MICROTUS MONTANUS ARIZONENSIS Bailey. 

 ARIZONA MEAI>0W-M0USE OR VOLE. 



Microtis montanus arisonensis Bailey, Proc. Biol. Sue. Washington, XII, p. 88, Apr. 30, 

 1898 (original description); North American Fauna, No. 17, June 6, 1900. — Mil- 

 i.ki: and Rehn, Proc. Bost. Soc. Nat. Hist., XXX., No. 1. Dec. 27, 1901, p. 119 

 Results Study N. Am. Mam. to close of 1900). 



[Microtus montanus] arizonensis, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 1S4 

 (Synop. Mam. N. Am.). 



Type-locality. — Springerville, Apache County, Arizona. 



MICROTUS ALTICOLA (Merriam). 

 SAN FRANCISCO MOUNTAIN VOLE. 



Arvicola (Mynomes) alticolus Merriam, North American Fauna, No. 3, Sept. 11, 1890, 



pi. v, tigs. 1 and 2; pi. vi, tigs. 1-4 (original description). 

 Microtus alticolus, Allen, Bull. Am. Mus. Nat. Flist., VII. p. 219, June 29, I 



Bailey, North American Fauna, No. 17, June 6, 1900, p. 52 (Revision of American 



Voles of the genus Micro! u 

 Microtus alticola, Miller and Rehn, Proc. Bost. Soc. Nat. Hist.. XXX, No. 1. Dec. 27, 



L901, p. 123 (Syst. Results Study N. Am. Mam. to close of 1900).— Elliot, Field 



Col. Mus., Zool. Ser., II, 1901, p. 192 (Synop. Mam. N. Am.). 



Type-locality. — Little Spring, San Francisco Mountain, Coconino 

 County, Arizona. Altitude, 8,200 feet. 



MICROTUS ALTICOLA LEUCOPH^US (Allen). 

 GRAHAM MOUNTAIN VOLE. 



Arvicola leucophseus Allen, Bull. Am. Mus. Nat. Hist., VI, Nov. 7, 1894, p. 320 (orig- 

 inal description). 



Microtus alticolus leucophaeus, Bailey, North American Fauna, No. 17, .tunc 6,1900, 

 p. 53 (Revision of American Voles of the genus Microtus). 



Microtus nltirolii leucopTiseus, Miller and Rehn, Proc. Bost. Soc. Nat. Hi-t., XXX, 

 Xo. 1. Dee. 27, 19(1! (Syst. Results Study X. Am. Mam. to close of 1900). 



[Microtus alticola] leucophseus, Elliot, Field Col. Mus., Zoo]. Ser., II, 1901, p. 192 

 (Synop. Mam. X. Am.). 



Type-locality. -Graham Mountains, Graham County, Arizona. 



