Zarucco duskywing
Conservation status
Secure (NatureServe)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Hesperiidae
Genus:	Erynnis
Species:	E. zarucco
Binomial name
Erynnis zarucco (H. Lucas, 1857)
Synonyms
Thanaos zarucco H. Lucas, 1857 Nisoniades terentius Scudder & Burgess, 1870 Nisoniades ovidius Scudder & Burgess, 1870 Nisoniades naevius Lintner, 1881 Antigonus diogenes Plötz, 1884

Erynnis zarucco, commonly known as the zarucco duskywing, is a species of butterfly in the family Hesperiidae. It is found (rarely) from southern Ontario to the southeastern United States.^[2]

The wingspan is 32–38 mm. There are three generations in the deep south but only two in the north.^[2]

The larvae feed on tree and herbaceous Fabaceae.