Oncocera semirubella

Alternative names
Rosy-striped Knot-horn

Wingspan 17 to 29 mm. A beautifully coloured little moth, with pink and yellow forewings, sometimes exhibiting a whitish stripe along the leading edge of the forewing.

Identification difficulty
Recording advice

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.


The preferred habitats are chalk downland and limestone cliffs.

When to see it

Flying in June and July, it can sometimes be seen in the afternoon sunshine, and later at night it comes to light.

Life History

The larval foodplants are Bird's-foot-trefoil and Clover the larvae forming strong silken tubes.

UK Status

The species occurs mainly in the southernmost counties of England and some eastern coastal areas. In the Butterfly Conservation's Microlepidoptera Report 2011 this species was classified as Nationally Scarce B.

VC55 Status

Rare in Leicestershire and Rutland. The Leicester Forest East record of 25 July 2019 is believed to be the first for VC55.

62.021 BF1441

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map