Agonopterix arnicella

Distinguished from similar Agonopterix species by the combination of three fuscous discal dots on the forewings with greyish fuscous clouding between them, the ill-defined pale basal patch, and the specific pattern of diffuse greyish fuscous dots along the costal and apical margins. The shining grey hindwings and overall pale ochreous ground color with greyish suffusion are additional diagnostic features.

Wingspan approximately 22 mm. Forewings pale ochreous, suffused and blotched with greyish fuscous, with three fuscous discal dots and slight greyish fuscous clouding between them. Ill-defined pale basal patch present. Costal and apical margins diffusely dotted with greyish fuscous. Hindwings shining grey.

North America: recorded from Alberta and Ontario in Canada; Washington, Oregon, and California in the United States.

Adults active from June to September.

Larvae feed on Erigeron species and Arnica angustifolia.

• Erigeron - larval food plant
• Arnica angustifolia - larval food plant

• Other Agonopterix speciesShare general Depressariidae morphology and wing patterning, but differ in specific arrangement and intensity of discal dots, basal patch definition, and host plant associations.

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life