76 MICROTUS. 



Microtus miurus oreas Osgood. 



Microtus miurus oreas Osgood, Proc. Biol. Soc. Wash., XX, 1907, 

 p. 61. 



Type locality. Toklat River, Alaskan Range, Alaska. 



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

 shorter. Skull narrower; braincase longer; 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. Ex type in 

 United 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. Saugeth. Suppl., Ill, 1842, 



p. 592. 

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



p. 405. 

 . Armcola (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. 

 Geogr. Distr. Central portion of Mississippi Valley from Wisconsin 

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

 sas and Nebraska. 



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

 this species in the Check-List, p. 248) Hypudaus ochrogaster is 

 placed with a ?. Osgood (/. c.) has shown that his name belongs to the 

 larger specimen of the two Wagner had for his type, and therefore it 

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

 type is in the Zoological Museum, Munich. 



Microtus elymocetes Osgood. 



Microtus elymocetes Osgood, Proc. Biol. Soc. Wash., XIX, 1906. 

 p. 71. 



