Aseptis fumosa

Distinguished from similar Aseptis species by the uniformly smoky dark blackish brown forewings without strong pattern contrast. The weakly figure-eight shaped reniform spot and the specific arrangement of antemedial and postmedial lines as dots on the costa are diagnostic. Male specimens can be identified by the pearly gray hindwing with accentuated vein asymmetry. The green larva with white subdorsal stripe and broad red and white lateral stripe is distinctive among western noctuid larvae.

Adults have a wingspan of 31.5–38 mm. Forewings are uniformly smoky dark blackish brown with brown filling of the antemedial and postmedial lines, most evident as dots on the costa. The reniform spot is weakly figure-eight shaped; the orbicular spot and short claviform spot are black and filled with ground color or slightly darker scales. Male hindwings are pearly gray distal to the discal spot, accentuating vein asymmetry. Female hindwings are smoky dark with dark but less conspicuous veins. Larvae are smooth and green with a white subdorsal stripe and broad red and white lateral stripe.

Occurs in diverse habitats including coastal chaparral, dry conifer forest, and shrub steppe. The species shows ecological flexibility across western North American ecosystems, from coastal environments to interior montane and semi-arid regions.

Western North America: western Canada (British Columbia, Alberta), Washington, Nebraska, Colorado, Utah, Arizona, Nevada, and California. Records indicate presence across a broad latitudinal and elevational range in the western United States and adjacent Canada.

Adults are on wing from April or May through July. The flight period spans late spring to mid-summer, with exact timing varying by latitude and elevation.

Larvae feed on Purshia species (including Purshia tridentata, bitterbrush), Cercocarpus species (mountain mahogany), Ceanothus species (including Ceanothus integerrimus, deerbrush), and Adenostoma fasciculatum (chamise). Adult feeding habits are not documented.

• Purshia tridentata - larval food plantbitterbrush
• Ceanothus integerrimus - larval food plantdeerbrush
• Adenostoma fasciculatum - larval food plantchamise
• Cercocarpus - larval food plantmountain mahogany genus
• Purshia - larval food plantbitterbrush genus
• Ceanothus - larval food plantCalifornia-lilac genus

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae are known to be smooth green with distinctive white subdorsal stripe and broad red and white lateral stripe. Pupation details are not documented. Adults emerge in spring to early summer.

Larval herbivore on woody shrubs; contributes to nutrient cycling and serves as prey for insectivores. The specialized feeding on chaparral and montane shrub species suggests a role in shaping vegetation structure in these communities, though specific ecological impacts have not been quantified.

No documented economic importance or direct human interactions. The species may serve as an indicator of healthy shrubland ecosystems in western North America. Not known to be a pest of agriculture or forestry.

• Other Aseptis speciesSimilar genus members share the general noctuid body plan and dark coloration, but differ in forewing pattern details, spot shapes, and hindwing coloration. A. fumosa is distinguished by its uniformly smoky dark forewings and specific spot morphology.

• noctuidae
• western north america
• chaparral
• shrub steppe
• conifer forest
• spring moth
• bitterbrush feeder
• sexual dimorphism

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Meloidae Holdings | Entomology Research Museum