Korscheltellus lupulina

Distinguished from other European Hepialidae by the combination of: brown forewings with variable but generally subdued patterning (lacking strong contrasting bands of some relatives); rapid, erratic flight low over vegetation; and early flight period (May–July). Separated from Korscheltellus fusconebulosa (Map-winged Swift) by less distinct forewing markings—K. fusconebulosa has more prominent dark brown patches creating a map-like pattern. Separated from Hepialus humuli (Ghost Moth) by smaller size, darker coloration, and different flight period (H. humuli flies June–August). Genitalia examination may be required for definitive identification of worn specimens.

Found in diverse open habitats including grasslands, meadows, pastures, road verges, gardens, and woodland clearings. Tolerates disturbed and anthropogenic environments. Larvae develop in soil, requiring areas with root systems of herbaceous plants.

Europe (widespread and common), including British Isles, Scandinavia, and Mediterranean regions. Extends eastward through northern Asia excluding China. Absent from North Africa. Records confirmed from Belgium (Antwerp province) and throughout temperate European range.

Adults fly from May to July in most of range, with peak activity typically in June. Single-brooded (univoltine). Larvae present year-round in soil, feeding on roots.

• Herbaceous plants - larval foodplantLarvae feed on roots of various herbaceous plants including grasses and forbs. Specific host records include Medicago lupulina (black medick), Plantago species, and various grasses.

Eggs laid singly or in small groups on vegetation or soil surface; hatch within 2–3 weeks. Larvae feed on plant roots, developing slowly over 2–3 years. Pupation occurs in underground cell; pupa overwinters. Adults emerge in spring, do not feed, and live approximately 1–2 weeks. Single generation per year.

Adults exhibit rapid, darting flight close to ground vegetation, often described as 'swift-like'—the source of the common name. Flight is most active in late afternoon and evening, particularly in warm, calm conditions. Adults do not visit flowers or feed. Males patrol territories and may form small lek-like aggregations. Females broadcast eggs while in flight, dropping them onto suitable vegetation or soil.

Larvae act as root herbivores, potentially affecting plant community composition in high-density populations. Adults serve as prey for bats, birds, and insectivorous insects. Soil-dwelling larvae contribute to soil aeration and nutrient cycling through burrowing activity.

Occasional minor pest in gardens and lawns when larval densities are high, causing yellowing or dieback of turf and herbaceous plants. Generally not economically significant. Used as indicator species in ecological studies due to abundance and ease of identification. Subject of citizen science monitoring in Europe.

• Korscheltellus fusconebulosaMap-winged Swift has more distinct dark brown patches on forewings creating map-like pattern; flies slightly later (June–August); genitalia differ.
• Hepialus humuliGhost Moth is larger (wingspan 46–70 mm), males are white, females are yellow-brown; flies June–August; larvae feed on roots of trees and shrubs rather than herbs.
• Pharmacis fusconebulosaFormerly confused with K. fusconebulosa; now recognized as distinct species with different genitalia and more northern distribution.

• moth
• swift moth
• Hepialidae
• root feeder
• Europe
• common species
• nocturnal

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Grasshoppers of Colorado