Hesperia tarquinius Fabricius, 1793 Feniseca tarquinius, the harvester, is a butterfly of the family Lycaenidae, and the only member of the monotypic genus Feniseca.

[2] The larvae feed on various aphids, such as Neoprociphilus, Pemphigus, Prociphilus, and Schizoneura.

It is found in early spring until fall and is generally scarce.

It lives in wooded areas near streams close to alders.

[4] Another butterfly which is possibly carnivorous is Celastrina serotina.