Three new ptychaspidid genera are described from the Upper Cambrian (Sunwaptan Stage) Mistaya Formation of Banff and Jasper national parks, southern Alberta. Proricephalus gen. nov. is represented by two species and is placed in the subfamily Ptychaspidinae. Both Sunwaptia gen. nov. and Wilcoxaspis gen. nov. are monotypic. They are assigned to a new ptychaspidid subfamily, the Macronodinae, which also includes Macronoda Lochman. New species described are Proricephalus wilcoxensis, Sunwaptia carinata, and Wilcoxaspis bulbosa.