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The male has a wingspan of about 44 mm and both forewings and hindwings are pure white. The female is larger (wingspan about 48 mm) and has yellowish-buff forewings with darker linear markings and brown hindwings. The adults fly from June to August and are attracted to light. The species overwinters as a larva. (Wiki)
Found in moist grassvegetation and cropland, exactly where I found him.
Male... Only one at PN at the moment, even though it's common :)