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A pale and somewhat silky light yellowish-grey moth. Darker markings include a somewhat erratic antemedian line and a toothed curving postmedian line, both with black blotches where they meet the costa, and a large reniform spot, all rather blurred and poorly defined. The subterminal area is slightly darker than the rest of the forewing, and the fringe is concolorous . The hindwings are very pale grey-brown, almost white. A non-descript moth with a rather delicate build. The cloudy pattern and silky sheen of Protoperigea species is difficult to describe but quite distinctive. They are similar in this regard to Pronoctua species, which are larger, darker and browner. The larger and browner P. posticata replaces anotha in the dry grasslands and badlands of southern Alberta.

A western species, occurring from the mountains of western Alberta north to Jasper, west to Lilloet BC and south to California. In Alberta it has been collected only in montane grasslands, from the Crowsnest Pass north to Jasper.