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A robust medium-size moth (3.9-4.5 cm wingspan) with pale buff-grey forewings with few prominent markings. Markings are more or less confined to a black basal dash and some scattered black scaling below the sinuous light line defining the lower part of the orbicular and the reniform spots. The antemedian line and in particular the scalloped postmedian line and the veins extending from it to the wing margin are usually lightly lined with dark scales. There is also a small patch of dark scales on the margin between each pair of vein, and the fringe is very faintly checkered. The hindwings are white, shading to light grey near the margin in most specimens. Some specimens, especially when very fresh, may be darker grey and better marked, but most seen have been very washed-out looking. The early stages are unknown.

Northern Arizona and New Mexico north to the Peace River area of west central Alberta, east to southwestern Saskatchewan and western North Dakota. In Alberta it has been collected in locally from the southern foothills north in the Red Deer River valley to Tolman Bridge Recreation area east of Trochu. There is a disjunct population in the Peace River district.