Subspecies and Distribution. N.m.micropusBaird,1855—fromSCKansasSthroughWCOklahomaandTexas(SCUSA)toN&ECoahuila,NuevoLeon,Tamaulipas,andextremeESanLuisPotosistates(NEMexico). N.m.canescensJ.A.Allen,1891—SEColorado,SWKansas,OklahomaPanhandle,NewMexico,andWTexas(SCUSA)andNChihuahuaState(NCMexico). N.m.leucophaeaGoldman,1933—knownonlyfromtheWhiteSandsNationalMonumentinSCNewMexico(SUSA). N.m.littoralisGoldman,1905—knownonlyfromAltamirainSETamaulipasState(NEMexico). N. m. planiceps Goldman, 1905 — known only from Rio Verde in SE San Luis Potosi State (EC Mexico). in Cricetidae

Subspecies and Distribution. N.m.micropusBaird,1855—fromSCKansasSthroughWCOklahomaandTexas(SCUSA)toN&ECoahuila,NuevoLeon,Tamaulipas,andextremeESanLuisPotosistates(NEMexico). N.m.canescensJ.A.Allen,1891—SEColorado,SWKansas,OklahomaPanhandle,NewMexico,andWTexas(SCUSA)andNChihuahuaState(NCMexico). N.m.leucophaeaGoldman,1933—knownonlyfromtheWhiteSandsNationalMonumentinSCNewMexico(SUSA). N.m.littoralisGoldman,1905—knownonlyfromAltamirainSETamaulipasState(NEMexico). N. m. planiceps Goldman, 1905 — known only from Rio Verde in SE San Luis Potosi State (EC Mexico).Published as part of Don E. Wilson, Russell A. Mittermeier & Thomas E. Lacher, Jr, 2017, Cricetidae, pp. 204-535 in Handbook of the Mammals of the World – Volume 7 Rodents II, Barcelona :Lynx Edicions on page 358, DOI: 10.5281/zenodo.670714