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Range DescriptionThis wide ranging species occurs from south-central Canada (north to near Outlook, Saskatchewan; Can. Field-Nat. 106:311-315) to north-central Mexico, west to western Montana, eastern Colorado, eastern Arizona, east to western Iowa, eastern Missouri, and central Arkansas in the USA (Herp. Rev. 20:12). There are disjunctive populations in southern Texas and in Arkansas, and in adjacent Mexico (Stebbins 1985, Conant and Collins 1991) in northern Chihuahua eastward to Tamaulipas.