Ambia punctimarginata is a moth in the family Crambidae. It is found in Papua New Guinea.[1]
The wingspan is about 14 mm. The forewings are white, with three spots on the costa and three indistinct dirty brown discal patches. There is a basal dot on the costa and a sooty black median spot below the subcostal vein. There is also a marginal band of sooty black spots. The hindwings are white with two or three irregular and indistinct patches of brown scales and a marginal row of sooty black spots.[2]