Ghost moths

Definition

Common name for moths of the family Hepialidae, a group of primitive Lepidoptera characterized by reduced mouthparts in adults (non-feeding), large size, and larvae that feed internally in roots or stems of host plants. The name derives from the pale coloration and erratic, floating flight of many species, particularly males of Hepialus humuli (the ghost swift) that hover over grassy areas at dusk.

Etymology

From the pale, translucent appearance of wings and the hovering, seemingly insubstantial flight pattern of males during crepuscular mating displays.

Example

The ghost moth Hepialus humuli exhibits strong sexual dimorphism: males are whitish with feathery antennae and perform lekking displays at dusk, while females are larger, yellow-brown, and emit pheromones to attract mates from upwind.

Synonyms

• Swift moths

Related Terms

• Hepialidae
• Primitive moths
• Lekking
• sexual dimorphism
• Root-boring larvae
• Crepuscular activity

Usage Notes

Often used interchangeably with 'swift moths,' though some specialists reserve 'ghost moths' for pale-colored species (especially Hepialus and related genera) and 'swift moths' for the broader family. The term is primarily European in usage; in North America, Hepialidae are more commonly called 'swift moths' or referred to by genus names (e.g., 'ghost swifts' for Sthenopis).