Pediasia aridella is a species of moth of the family Crambidae.

The forewings are ochreous, veins variably pale or whitish, interneural spaces sometimes blackish-sprinkled; a blackish streak beneath median vein from base to middle; lines obscurely darker, on lower half blackish mixed, median very strongly curved, very oblique dorsally, second curved, slightly indented below middle; three or four black dots on lower half of termen; cilia ochreous, mixed with white.

The larva is pale ochreous-grey; dorsal line darker; spots light brownish; head light or dark brown, darker-marked; plate of 2 sometimes dark brown.

[1] The moth flies from June to September depending on the location.

This article relating to the moth tribe Crambini is a stub.