The marbled white (Melanargia galathea) is a medium-sized butterfly in the family Nymphalidae, subfamily Satyrinae — one of the 'browns' despite its striking black-and-white chequered wing pattern. Adults fly from late June to early September across flower-rich grasslands, chalk downland, and meadows throughout most of Europe, North Africa, and western Asia. Both sexes feed extensively on nectar, showing a marked preference for purple-flowered plants such as knapweeds, thistles, and scabious. Larvae feed nocturnally on fine grasses, especially fescues (Festuca spp.) and cocksfoot (Dactylis glomerata), making unimproved grassland with a mix of wildflowers and coarse grasses the ideal garden or meadow habitat.

Nectar plants · 2

Found across most of Europe except Ireland, northern Britain, Scandinavia (apart from Denmark), Portugal, and most of Spain (where it is replaced by the closely related Melanargia lachesis); extends through Turkey, the Caucasus, and Iran. In Britain it is largely confined to southern and south-western England and south Wales but has been expanding northward and eastward in recent decades, likely linked to climate warming. Populations in the Maghreb region of North Africa are currently treated by most authorities as a separate species, Melanargia lucasi, though some sources retain them as a subspecies of M. galathea.