Macrothylacia rubi, the fox moth, is a lepidopteran belonging to the family Lasiocampidae.

[1] This species can be found from Western Europe to Central Asia and Siberia.

Both sexes show two narrow, straight, light-yellow, transverse bands, running across the forewings.

They are initially black with bright yellow or orange segments, later they become darker, always covered with blackish and tawny-coloured hairs and with light grey hair on the sides.

[5] Caterpillars feed on heather (Calluna) bramble (Rubus fruticosus), Gramineae, Betula verrucosa, Salix, Populus tremula, Vicia cracca, Trifolium medium, Trifolium pratense, Vaccinium myrtillus, Fragaria, Potentilla and Geranium sylvaticum.