Ethmia albistrigella

Walsingham, 1880

Ethmia albistrigella is a small in the Ethmiidae, distributed across western North America from British Columbia to California. The is characterized by a distinctive white longitudinal streak on dark forewings. Two are recognized: the nominate form and the Arctic-Alpine race icariella, which is restricted to California and exhibits darker coloration. are active from late spring through summer, and larvae feed on specific plants in the Boraginaceae family.

Pronunciation

How to pronounce Ethmia albistrigella: //ˈɛθ.mi.ə æl.bɪˈstrɪ.dʒɛl.lə//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

The white longitudinal streak on the forewings distinguishes this from most other Ethmia. icariella can be recognized by its almost entirely black surface, including the . The species may be confused with other Ethmia species, which generally share similar black-and-white coloration, but specific identification often requires examination of genitalic characters. The Ethmia is further distinguished from superficially similar by upturned labial palps that project forward like small horns between the .

Appearance

A small with forewing length of 7.1–9.4 mm. Forewings are dark blackish brown, darkest in the and paler toward the margins, with a prominent white longitudinal streak. Hindwings are dark brown. icariella is distinguished by being almost wholly black dorsally, including the .

Habitat

Found in mountainous regions, including Rocky Mountain and Pacific coast ranges. icariella occupies Arctic-Alpine zone in California. The occurs in areas supporting its larval plants.

Distribution

North America: southern British Columbia southward through the Rocky Mountains to southwestern Colorado and the Wasatch Range in northern Utah; Pacific coast from western Washington and Oregon into the mountains of California. icariella is known only from Mono Pass, Inyo County, California.

Seasonality

are on wing from late April to early August.

Diet

Larvae feed on Phacelia ramosissima and possibly Lappula floribunda. icariella probably feeds on Phacelia frigida.

Host Associations

Phacelia ramosissima - larval confirmed
Lappula floribunda - possible larval unconfirmed
Phacelia frigida - probable larval for icariella

Life Cycle

Complete with , larval, pupal, and stages. Larval is poorly documented but follows the typical Ethmia pattern of feeding on plant tissues.

Behavior

are and attracted to light. Specific behavioral details beyond period are not documented.

Ecological Role

Herbivore as larvae, feeding on specific Boraginaceae plants. ecological role is likely as when visiting flowers for nectar, though this has not been specifically documented for this .

Human Relevance

No documented economic importance or pest status. The is of interest to lepidopterists and biodiversity researchers.

Similar Taxa

Other Ethmia speciesSimilar black-and-white coloration pattern; distinguished by specific wing markings, particularly the distinct white longitudinal streak, and often require genitalic examination for definitive identification
Tortricidae (leafroller moths)Superficially similar resting posture; distinguished by upturned labial palps in Ethmia that project like horns between

More Details

Subspecies

Two recognized: Ethmia albistrigella albistrigella (widespread western North American form) and Ethmia albistrigella icariella Powell, 1973 (Arctic-Alpine zone race from California with darker coloration)

Taxonomic History

The Ethmia was formerly placed in Coleophoridae, then Depressariidae, and is now treated in family Ethmiidae.