Ethmia epileuca

Powell, 1959

Ethmia epileuca is a small in the Ethmiidae (formerly placed in Depressariidae). It is restricted to the southwestern United States, occurring in southern California and Tucson, Arizona. are active in late winter and early spring, with period from February through April. The exhibits distinctive wing patterning with a straight longitudinal line dividing brown or gray-brown upper and white lower forewing areas.

Pronunciation

How to pronounce Ethmia epileuca: /ˈɛθmiə ˌɛpɪˈljuːkə/

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Identification

Distinguished from other Ethmia by the straight (not curved or irregular) longitudinal line dividing forewing coloration and the completely white hindwings including fringe. The uniform white hindwing coloration separates it from species with gray or patterned hindwings. Forewing pattern of brown/gray-brown above and white below is characteristic but requires comparison with similar southwestern Ethmia species.

Appearance

Small with forewing length 8.3–10.4 mm. Forewings with ground color divided by a straight longitudinal line: brown or gray-brown above the line, white below. Hindwings entirely white, including fringe and underside.

Distribution

United States: southern California and Tucson, Arizona. The has a restricted range in the southwestern United States with disjunct in coastal southern California and the Tucson area of Arizona.

Seasonality

on wing from February to April. This late winter to early spring period is relatively early compared to many in the region.

Similar Taxa

Ethmia discostrigellaOccurs in same general region (southwestern US) and shares ; differs in forewing pattern details and likely hindwing coloration
Other Ethmia speciesApproximately 50 of Ethmia occur in North America north of Mexico, many in the Southwest; most differ in forewing pattern curvature, hindwing coloration, or size

More Details

Taxonomic placement

Ethmia was formerly placed in Depressariidae but is now classified in family Ethmiidae (superfamily Gelechioidea). This reclassification reflects ongoing refinement of lepidopteran .

Larval biology

Larvae of Ethmia typically feed on plants in Boraginaceae, Ehretiaceae, and Hydrophyllaceae. The specific plant for E. epileuca has not been documented.