Grammodes justa, the plain box-owlet, is a moth of the family Noctuidae first described by Francis Walker in 1858.Poole, R. W. (1989). Lepidopterorum Catalogus (New Series) Fascicle 118, Noctuidae. . CRC Press. . It is found in the northern half of Australia and Papua New Guinea.Pagenstecher, Arnold (1899). "Die Lepidopterenfauna des Bismarck-archipels". Zoologica. Hft. 27-29: 1-267. 2 pl.
The wingspan is about 40 mm. The moths prefer the warmer climate of northern Australia and are considered a pest in the Northern Territory.
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