TUNDRA VOLE, Microtus oeconomus 



(Avingak) 



Range. — Most of Alaska, Yukon, and District, 

 of Mackenzie. 



Habit<tt. — Tundra, grassy or sedgy areas, damp 

 or dry; in wet, brushy ai'eas in northeastern 

 Brooks Range; ubiquitous at Cape Thompson. 



Races in Alaska. — Ten races occur widely in 

 Alaska. Tlie mainland forms include m-avfarhni 

 of northern and eastern Alaska, east of the Utukak 

 River; operarius (type locality: St. Michael, 

 Norton Sound) of the western and southern main- 

 land, as well as Kodiak and Afognak Islands; and 

 yaJcutatensis (type locality : north shore of Ya- 

 kutat Bay) from Yakutat Bay to Point Gustavus. 

 Island forms are the following: amakensis (type 

 locality: Amak Island, Bering Sea) restricted to 

 Amak Island; elymocetes (type locality: Monta- 

 gue Island, Prince William Sound) restricted to 

 Montague Island; innuitus (type locality: North- 

 east Cape, St. Lawrence Island) restricted to St. 



Lawrence Island; pofofensis (type locality: 

 Popof Island, Shumagin Islands) known only 

 from Popof and Unga Islands; punukensis (type 

 locality : Big Punuk Island, near esist end St. 

 Lawrence Island) restricted to the Punuk Islands; 

 sitkensis (type locality: Sitka) known only from 

 Baranof and Chichagof Islands ; and unalascensis 

 (type locality: Unalaska) laiown from Sanak, 

 Tigalda, Unalaska, and Unimak Islands. 



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