Acraga isothea is a moth in the Dalceridae family. It was described by Dognin in 1914. It is found in Costa Rica and Panama. The habitat consists of tropical premontane wet and rain forests. The length of the forewings is 12–14 mm. The forewings are white, with reddish brown suffusion over the inner margin (except near the base), the outer margin and postmedial area. There is a reddish brown spot at the apex. The hindwings are white with a reddish brown anal angle. Adults have been recorded on wing in July.