Limenitis arthemis, the red-spotted purple or white admiral, is a North American butterfly species in the cosmopolitan genus Limenitis. It has been studied for its evolution of mimicry, and for the several stable hybrid wing patterns within this nominal species; it is one of the most dramatic examples of hybridization between non-mimetic and mimetic populations.

Limenitis is a genus of brush-footed butterflies, commonly called the admirals. The sister butterflies (Adelpha) and commander butterflies (Moduza) are sometimes included here.