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A small (2.2-2.3 cm wingspan) diurnal moth with a dark maroon and/or grey forewing with pale cream patches. The maroon area comprises a broad basal streak, the costa and a broad subterminal band. The large orbicular and reniform and a broad terminal band are grey. The area of the disc, surrounding the deiform and orbicular and reaching the lower wing margin is pale yellow. The hindwing is pale yellow with a black basal patch, a large black discal spot and a broad black terminal band. The pale yellow ground is confined to 3 spots surrounding the black discal spot. The fringe is pale. Very similar to Eutricopis nexilis, but nexilis has 2 pale spots on the hindwing, persimilis has a third one between the discal mark and the wing base, and nexilis has pink patches on the ventral forewing, which persimilis lacks.

From east central Alberta and the Cypress Hills in Saskatchewan north to the southern Yukon, west and south to Colorado, Utah, California and Oregon. In Alberta, collected mainly in the mountains and foothills, but also in the parklands east to the Wainwright area.