7C> MICROTUS. 



Microtus miurus oreas Osgood. 



Microtus miurus oreas Osgood, Proc. Biol. Soc. Wash., XX, 1007. 

 p. 61. 



Type locality. Toklat River, Alaskan Range'. Alaska. 



Gcnl. Char. Similar to M. miurus, but more ochraceous; tail 

 shorter. Skull narrower; braincase lunger; zygomata not so wide 

 anteriorly. 



Color. Upperparts and flanks clay-color, mixed on back with 

 dusky; underparts pale ochraceous-buff ; hands and feet cream-buff; 

 tail pale ochraceous-buff, tinged with dusky above. MX type in 

 1'nited States National Museum. 



Measurements. Total length, 125; tail, 20; hind foot, 19.2. 

 Skull: Occipito-nasal length, 26; Hensel, 24.5; zygomatic width, 13; 

 intertemporal width, 3.4; length of nasals, 7.4; length of upper molar 

 series, 5.2;. length of mandible, 14.5; length of lower molar series, 5.7. 

 Ex type in United States National Museum. 



Microtus ochrogaster (Wagner). 



Hypudaus ochrogaster Wagn., Schreb. Sjiugeth. Suppl., Ill, 1842, 



p. 592. 

 Arvicola austerus Le Conte, Proc. Acad. Nat. Sci. Phila., VI, 1853, 



p. 405. 

 Arcicola (Pedomys) cinnamomea Baird, Mamm. N. Am., 1857, p. 



541- 



Microtus austerus Elliot, Syn. N. Am. Mamm., F. C. M. Pub., II, 



1901, p. 196, fig. 40, Zool. Ser.; Id. Check-List Mamm. N. Am. 

 Cont. and West Indies, VI, 1905, p. 248. 

 Microtus ochrogaster Osgood, Proc. Biol. Soc. Wash., XX, 1907, 



p. 48- 



Type locality. Racine, Racine County, Wisconsin. 

 Gcogr. Distr. Central portion of Mississippi Valley from Wisconsin 

 ' - > southern Missouri and Fort Reno, Oklahoma, west to eastern Kan- 

 sas and Nebraska. 



In the synonymy of Microtus austerus (which was the name of 

 'his species in the Check-List, p. 248) Hypud(rns ochrogaster is 

 ; .laced with a ?. ( )sgood (/. r.) has shown that his name belongs to the 

 larger specimen of the t.\vo \Vav.ner had for his type, and therefore it 

 will be the- one by which the species will be hereafter known. The 

 'vpc is in the Zoological Museum, Munich. 







Microtus elymocetes ()sgond. 



Microtus elynioietes Usgood, Proc. IJiol. Soe. Wash., XIX, ioo<> 



P- ?' 



