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Erynnis horatius
Horace's Duskywing (Erynnis horatius) is a butterfly of the Hesperiidae family. Upperside of male forewing is dark brown with little contrast and no white overscaling. Underside of hindwing is usually without 2 spots below the apex. The male has a costal fold containing yellow scent scales
Adults feed on various flowers of plants up to about 4.5 feet tall, including dogbane, buttonbush, sneezeweed, goldenrod, peppermint, boneset, and winter cress.
Thank you LivanEscudero for helping me ID Horace's Duskywing/Erynnis horatius
I think my ID suggestion is right, but not 100% sure. It seems to be one of our Duskywing Skippers, but you may want to wait for more expert confirmation.
http://bugguide.net/adv_search/bgsearch....