''Boursinidia atrimedia'' is a moth of the family Noctuidae. It is found in Chile (Tierra del Fuego, Rio Mc Clelland, Chaitén, Punta Arenas and Ojo Bueno) and Argentina (Nahuel Huapi, San Martín de los Andes and Bariloche). The wingspan is about 42 mm. Adults are on wing from November to December.

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Noctuinae of Chile
Noctuinae Fauna of Argentina Fauna of Chile Moths of South America {{Noctuinae-stub