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Horace's duskywing

Female

Male
Conservation status
Secure (NatureServe)^[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Hesperiidae
Genus:	Erynnis
Species:	E. horatius
Binomial name
*Erynnis horatius* (Scudder & Burgess, 1870)
Synonyms
List Nisoniades horatius Scudder & Burgess, 1870 Nisoniades virgilius Scudder & Burgess, 1870 Nisoniades petronius Mead, 1875 (nom. nud.) Nisoniades petronius Lintner, 1881 Thanaos petronius (Lintner, 1881) Thanaos horatius (Scudder & Burgess, 1870)

Erynnis horatius, commonly known as Horace's duskywing, is a species of butterfly in the family Hesperiidae. It is found in the United States from Massachusetts to Florida, and west to eastern South Dakota, the Gulf Coast, south-eastern Utah, Colorado, north-eastern Arizona, and New Mexico. It is listed as a species of special concern in the US state of Connecticut.^[2]

Fringes are brown. Upperside of male forewing is dark brown with little contrast and no white overscaling. Upperside of female forewing is light brown with a contrasting pattern and large transparent spots. Underside of hindwing is usually without two spots below the apex. The male has a costal fold containing yellow scent scales; the female has a patch of scent scales on the 7th abdominal segment. The wingspan is 36–49 mm.^[3]

There are two generations in the north, with adults on the wing from April to September; there are three generations in the deep south and Texas, with adults on the wing from January to November. Adults prefer open woodlands and edges, clearings, fence rows, wooded swamps, power-line right-of-ways, open fields and roadsides.^[3]

Caterpillars are hosted by various oak species such as willow oak (Quercus phellos), northern red oak (Q. velutina), scrub oak (Q. ilicifolia), water oak (Q. nigra), post oak (Q. stellata), and live oak (Q. virginiana). Adults consume nectar from flowers up to about 4.5 feet (1.4 m) above ground level, including those of dogbane, buttonbush, sneezeweed, goldenrod, peppermint, boneset, and winter cress.^[1]^[3]

References

^ ^a ^b NatureServe (31 May 2024). "Erynnis horatius". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 3 June 2024.
^ "Connecticut's Endangered, Threatened and Special Concern Species 2015". State of Connecticut Department of Energy and Environmental Protection Bureau of Natural Resources. Retrieved January 27, 2018.
^ ^a ^b ^c "Horace's Duskywing Erynnis horatius (Scudder & Burgess, 1870) | Butterflies and Moths of North America". Retrieved 3 June 2024.

External links

Erynnis horatius - Horace's Duskywing, BugGuide
Erynnis horatius, Butterflies and Moths of North America
Horace's Duskywing Archived 2011-09-27 at the Wayback Machine, Massachusetts Butterfly Club
Horace's Duskywing, Butterflies of Canada

Taxon identifiers
Erynnis horatius	Wikidata: Q1312597 BAMONA: Erynnis-horatius BioLib: 704226 BOLD: 20040 BugGuide: 17268 CoL: 6GRVC EoL: 180994 GBIF: 5977216 iNaturalist: 50071 IRMNG: 10277731 ITIS: 706742 LepIndex: 183533 MONA: 3952 NatureServe: 2.114552 NCBI: 509305 Open Tree of Life: 721519

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