''Ostrinia marginalis'' is a moth in the family Crambidae. It was described by Francis Walker in 1866. It is found in North America, where it has been recorded from

Newfoundland Newfoundland and Labrador (; french: Terre-Neuve-et-Labrador; frequently abbreviated as NL) is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region ...

and Maine west to Alberta, the

Northwest Territories The Northwest Territories (abbreviated ''NT'' or ''NWT''; french: Territoires du Nord-Ouest, formerly ''North-Western Territory'' and ''North-West Territories'' and namely shortened as ''Northwest Territory'') is a federal territory of Canada. ...

and Yukon. The habitat consists of bogs and marshes. The wingspan is 15–17 mm. The forewings and hindwings are dark brown with a white postmedial line. The larvae feed on ''

Rumex The docks and sorrels, genus ''Rumex'', are a genus of about 200 species of annual, biennial, and perennial herbs in the buckwheat family, Polygonaceae. Members of this genus are very common perennial herbs with a native almost worldwide distribu ...

'' and '' Polygonum'' species.

References

Moths described in 1866 Pyraustinae {{Pyraustinae-stub