Leptarctia is a monotypic tiger moth genus in the family Erebidae described by Stretch in 1872. Its only species, Leptarctia californiae, was described by Francis Walker in 1855. It is found in western North America, from New Mexico and Colorado to California and north to British Columbia. The habitat consists of open forests, meadows and clearings in the mountains.

The length of the forewings is 12–17 mm.

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