A new species, Harrymys canadensis, referable to the Harrymyinae (Heteromyidae), is described from the Barstovian Wood Mountain Formation of Saskatchewan. The genus Stratimus Korth et al. is included in the heteromyid subfamily Harrymyinae. Harrymys canadensis is the youngest species of the subfamily and is more derived than Stratimus or the Hemingfordian species of Harrymys. The Harrymyinae may be derived from the latest Arikareean Proheteromys matthewi Wood.

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