Subspecies and Distribution. S.t.tundrensisMerriam,1900—Alaskaincluding S.t. Lawrence and Kodiak Is (USA) and N & W Yukon, extreme NE British Columbia, and N Northwest Territories (NW Canada). S.t.baikalensisOgnev,1913—TransbaikaliaandtheadjacentstepperegionofNMongolia(KhentiiMts);thissubspeciesmayalsooccurintheforest-steppeofNMongoliatoLakeKhuvsgul. S.t.borealisKastschenko,1905—ESiberiantundrafromYeniseiGulfEtoChukchiPeninsula(ERussia). S.t.buxtoniJ.A.Allen,1903—ESiberiantaigafromVilyuyRiverBasinEtoOkhotskSeacoast(ERussia). S.t.parvicaudatusOkhotina,1976—MoneronI,CSeaofJapan. S.t.petschoraeOgnev,1921—UralMtsandWSiberiaEtoYeniseiRiver(CRussia). S.t.schnitnikoviOgnev,1921—C&SAltaiandmountainsofEKazakhstan(Tarbagatai,Saur,andDzungarianAlatau)andNWChina(Xinjiang...
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