Appearance
The wingspan is 30–40 mm. Adult: two dark bands on each forewing almost touch each other near the midline, and the inner (or more basal) band touches the inner margin [whereas in Caenurgina erechtea, the bands do not touch each other near the midline, and the inner (or more basal) band does not touch the inner margin]. The color can vary but a brown base color almost always points towards C. crassiuscula.
Distribution
It is found from coast to coast in the United States and adjacent parts of Canada, in the west to the Northwest Territories, Yukon, and Alaska. Adults are on wing from March to November depending on the location.References:
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https://bugguide.net/node/view/9680