Isognathus australis is a moth of the Sphingidae family. It is known from north-eastern Brazil.The wingspan is 70 mm for males. It is similar to Isognathus rimosa rimosa and Isognathus rimosa papayae but has narrower wings. The forewing upperside is unicolorous brown, shaded with white, except for a yellow band along the posterior margin and the faint traces of a distal marginal band.
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