
Appearance
This species is extremely similar to the marbled minor and the rufous minor and specific identification usually requires close study of the genitalia. See Townsend et al. for genitalia images and an identification key. With a wingspan of 24–27 mm, "O. latruncula" is usually the smallest of the three, although they all overlap in size. Well-marked specimens often have noticeably dark forewings, with a blackish basal area and a coppery brown, rather than whitish, subterminal band. However, melanism is very common in this species and all-dark specimens constitute 100% of the population in some areas. "O. latruncula" flies at night from May to August and is attracted to light and sugar.
Food
The larva feeds internally on the stems of various grasses including "Calamagrostis" and "Dactylis", pupating in a cocoon among the roots. This species overwinters as a larva.# ^ "The flight season refers to the British Isles. This may vary in other parts of the range."
References:
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