Macrothylacia rubi, the fox moth, is a lepidopteran belonging to the family Lasiocampidae. It was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.^[1]

Quick Facts Fox moth, Scientific classification ...

Fox moth
Male
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Lasiocampidae
Genus:	Macrothylacia
Species:	M. rubi
Binomial name
Macrothylacia rubi (Linnaeus, 1758)
Synonyms
Phalaena rubi Linnaeus, 1758 Macrothylacia pygmaea Reuter, 1893 Macrothylacia rubi ab. transfuga Krulikowsky, 1908

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This species can be found from Western Europe to Central Asia and Siberia.^[2][3] These moths live in open woodlands, moors and prairies.^[4][5]

The wingspan of the male is 40–65 mm.^[5] The wings are reddish brown in males while females are usually paler, more greyish in colour and slightly larger than males. Both sexes show two narrow, straight, light-yellow, transverse bands, running across the forewings. The abdomen is thick, grey brown and hairy.^[5] The caterpillars can reach a length of about 80 millimetres (3.1 in). 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][6]

• Both sides of male
• Both sides of female

It is a univoltine species. Between September and March the caterpillars hibernate in leaf litter. These moths take flight from May to July. The males usually fly in the afternoon and night, while the females fly only at night.^[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.^[2][5][7]

• Eggs
• Caterpillar
• Male
• Female
• Male in the Dresden Heath