Hydriomena macdunnoughi

Distinguished from other Hydriomena species by the combination of small size (14–16 mm wingspan), dark ashen grey forewings with a broad irregular central fuscous band, and pale hindwings bearing six to seven brown wavy hair-lines. The specific pattern of the hindwing lines and the prominent forewing band separate it from congeners in the western North American fauna.

Small moth with wingspan 14–16 mm. Forewings dark ashen grey with broad, irregular fuscous band centrally positioned. Hindwings pale grey with six to seven indeterminate brown wavy hair-lines crossing the wing surface. Overall coloration muted and cryptic.

Associated with willow habitats; specific habitat requirements not documented beyond presence in regions supporting Salix species.

Western North America: recorded from Yukon Territory, western Alberta, and Colorado.

Adults on wing April through July.

Larvae feed on Salix (willow) species.

• Salix - larval food plantGenus-level association; specific willow species not documented

Larval herbivore on willows; specific ecological impacts not documented.

• Other Hydriomena speciesSimilar size and general appearance; distinguished by specific wing pattern elements including the broad irregular forewing band and the characteristic six to seven brown wavy lines on pale hindwings

• geometrid moth
• western North America
• willow feeder
• small moth
• spring-summer flight

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