Oncocera semirubella
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Rosy-striped Knot-horn
Found chalk downland and limestone cliffs, and the species occurs in the southernmost counties of England.
The larval foodplants are bird's-foot trefoil (Lotus) and clover (Trifolium), the larvae forming strong silken tubes.
The forewings are light crimson or pink, sometimes much mixed with grey or dark grey, a whitish, greyish-ochreous, or grey costal streak; a broad ochreous-yellowish dorsal suffusion.
Hindwings grey, slightly rosy-tinged.
The Adult Moth flies in one generation by the end of June to August.
It is easily disturbed on short grassland, flies from dusk onwards, and is attracted to light and sugar.