Subspecies and Distribution. M. o. ochrogaster Wagner, 1843 — from extreme SE South Dakota, E Nebraska, E Kansas, and extreme NE Oklahoma E to SW Michigan, Indiana, Kentucky, Tennessee, and extreme NE Alabama, USA. M.o.haydeniiBaird,1858—fromNEM.o.attheCanadianborderandNWNorthDakotaStoNENewMexicoandCOklahoma,USA. M.o.ludovicianusBailey,1900—disjunctlimitedrangeontheSETexasandSWLouisianacoast,USA. M.o.minorMerriam,1888—fromCAlbertaandCSaskatchewan,Canada,SEtoSESouthDakota,SMinnesota,andCWisconsin,USA. M.o.ohionensisBole&M.o.,1942—WOhio,EKentucky,andWWestVirginia,USA. M.o.similisSeveringhaus,1977—fromCM.o.StoCWyomingandextremeSWSouthDakota,USA. M. o. taylori Hibbard & Rinker, 1943 — SW Kansas and extreme NW Oklahoma, USA. in Cricetidae

Subspecies and Distribution. M. o. ochrogaster Wagner, 1843 — from extreme SE South Dakota, E Nebraska, E Kansas, and extreme NE Oklahoma E to SW Michigan, Indiana, Kentucky, Tennessee, and extreme NE Alabama, USA. M.o.haydeniiBaird,1858—fromNEM.o.attheCanadianborderandNWNorthDakotaStoNENewMexicoandCOklahoma,USA. M.o.ludovicianusBailey,1900—disjunctlimitedrangeontheSETexasandSWLouisianacoast,USA. M.o.minorMerriam,1888—fromCAlbertaandCSaskatchewan,Canada,SEtoSESouthDakota,SMinnesota,andCWisconsin,USA. M.o.ohionensisBole&M.o.,1942—WOhio,EKentucky,andWWestVirginia,USA. M.o.similisSeveringhaus,1977—fromCM.o.StoCWyomingandextremeSWSouthDakota,USA. M. o. taylori Hibbard & Rinker, 1943 — SW Kansas and extreme NW Oklahoma, USA.