Oncocera semirubella, the rosy-striped knot-horn, is a small moth of the family Pyralidae.
Distribution It is found in European regions, including the British Isles, and East Asia (e.g. China, Japan, South Korea and Taiwan).
Description
The wingspan is 26–30 mm. 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 larva is bronzy-blackish, with ten indistinct greenish lines; a whitish lateral spot on 3, including a black dot; head and plate of 2 black : amongst web on Lotus.Meyrick, E., 1895 A Handbook of British Lepidoptera MacMillan, London pdf Keys and descriptionlepiforum.de includes imagesParsons, M. Clancey, C. 2023 A Guide to the Pyralid and Crambid Moths of Britain and Ireland Atropos Publishing ISBN 9780955108648
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.
Biology The larvae feed on bird's-foot trefoil (Lotus corniculatus), white clover, Ononis species, horseshoe vetch and Medicago species.
Notes The flight season refers to Belgium and the Netherlands; this may vary in other parts of its range.
References
External links
waarneming.nl Lepidoptera of Belgium UKmoths