Erynnis lucilius, the columbine duskywing, is a species of butterfly in the family Hesperiidae. It is found in North America from southern Quebec to Manitoba and south to the north-eastern United States. It is part of the skipper family because its wings create a skipping pattern.

The wingspan is 21–29 mm (0.83–1.14 in). There are two generations in the east from early May to mid-June.

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