Eterusia aedea, the red slug caterpillar, is a species of moth in the family Zygaenidae.

It is found in Sri Lanka, India, Nepal, Taiwan, Japan and China.

The basal black area of the hindwings is larger, reducing the width of the yellow band, which is very pale.

[1] The larvae have been recorded feeding on a wide range of plants, including Bischofia javanica, Aporosa lindleyana, Aporosa villosa, Cornus florida, Lagerstroemia, Melastoma candidum, Myrica rubra, Sloanea formosana, Rhododendron, Symplocos glauca, Camellia (including C. japonica, C. sasanqua, C. sinensis, C. oleifera), Eurya japonica, Eurya septata, Cleyera japonica and Buddleja.

The larvae of subspecies aedea, sinica, formosana, cingala and virescens have been reported as pests on tea.