Erynnis propertius

{{Short description|Species of butterfly}}

{{Speciesbox

| image = Erynnis propertius (Propertius Duskywing) (7437712788).jpg

| image_caption =

| taxon = Erynnis propertius

| authority = (Scudder & Burgess, 1870)

| synonyms =

• Nisoniades propertius Scudder & Burgess, 1870
• Nisoniades tibullus Scudder & Burgess, 1870
• Thanaos propertius Lintner, 1881

}}

Erynnis propertius, commonly known as Propertius duskywing, is a species of butterfly in the family Hesperiidae. It is found in along the west coast of North America from southern British Columbia south along the Pacific Slope to Baja California Norte. It is one of the most commonly seen skippers in California.{{Cite book |last=Will |first=Kip |title=Field Guide to California Insects |last2=Gross |first2=Joyce |last3=Rubinoff |first3=Daniel |last4=Powell |first4=Jerry A. |publisher=University of California Press |year=2020 |isbn=9780520288744 |location=Oakland, California |pages=402}}

The wingspan is 35–45 mm.{{Cite web |last=Shapiro |first=Arthur |title=Erynnis propertius |url=https://butterfly.ucdavis.edu/butterfly/erynnis/propertius |website=Art Shapiro's Butterfly Site}}