In his "Revision of the pocket mice of the genus Perognathus," Osgood (1900:18-20) reviewed the distribution, as then known, of _Perognathus fasciatus_ and recognized two geographic races--_Perognathus fasciatus_ [_fasciatus_] Wied-Neuwied in eastern Montana and Wyoming and adjacent parts of North and South Dakota, and _Perognathus fasciatus infraluteus_ Thomas, known only from the type locality at Loveland, Larimer County, Colorado. Later, Cary (1911:61) described _Perognathus fasciatus litus_ as a pale subspecies occurring in the lower Sweetwater Valley and adjacent parts of the Red Desert of south-central Wyoming. After 1911 no important taxonomic contributions dealing with _Perognathus f…
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