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The wingspan is 28–38 mm. There is clear sexual dimorphism in the imago, with the male having a brownish gray colour and a forewing length of 14–17 mm, and the female being white and a having a forewing length of 17–19 mm. The female resembles Spilosoma lubricipeda, but that species has longer and smaller wings and a yellow and black back. The moth flies April to July depending on the location.