Catocala

Definition

A large, primarily Holarctic genus of moths in the family Erebidae, subfamily Erebinae, characterized by cryptic, bark-patterned forewings that conceal brightly banded hindwings ('underwings') exposed only in flight. The genus comprises roughly 250 species and serves as a classic example of flash coloration in Lepidoptera.

Etymology

From Ancient Greek κάτω (katō, 'beneath, below') + καλός (kalos, 'beautiful'), referring to the vivid, often red, orange, or yellow coloration hidden on the underwings.

Example

Catocala ilia, the beloved underwing, rests with wings folded to mimic weathered tree bark; when disturbed, it flashes its black-and-orange hindwings to startle predators before escaping.

Synonyms

• underwing moths

Related Terms

• Erebidae
• Erebinae
• Lepidoptera
• flash coloration
• Crypsis
• hindwing
• forewing
• Holarctic

Usage Notes

The common name 'underwing moth' properly refers to species of Catocala, though it is occasionally applied loosely to related erebid genera with similar color patterns. In plural usage ('underwings'), the term almost exclusively denotes Catocala species. The genus is taxonomically stable but has undergone periodic revision; some former subgenera have been elevated to genus rank in recent treatments.