Pontia daplidice, the Bath white, is a small butterfly of the family Pieridae, the yellows and whites, which occurs in the Palearctic region. It is common in central and southern Europe, migrating northwards every summer, often reaching southern Scandinavia and sometimes southern England.
The Bath white is a small white butterfly with a wingspan of 45 to 50 mm. The underside of the hindwing has a pattern of greenish blotches, which is characteristic of the Bath whites and easily identifies it from other pierids.
Sexes can be differentiated by markings on the forewing. The male is differentiated from the female by the markings on the upperside of the forewing. The apex of the forewing is black with white spots and lines. There is a black spot at the end of the cell. In the case of the female, there is an additional discal spot in 1b. The female also has an obscure row of terminal and marginal spots on the upper hindwing.
The Bath White (Pontia daplidice/ edusa) is a migratory white butterfly known for its unique green and white patterned hindwings (underside), distinctive black spots on forewings, and a preference for sunny, dry, flowery habitats like dunes and waste ground, feeding larvae on plants like mustard and mignonette, and being easily confused with its close relatives.
Appearance & Identification
Wingspan: Around 45-50mm.
Upperside: White with black spots and markings, especially on forewing apex; females have extra spots.
Underside (Hindwing): The key feature is a mosaic of greenish-yellow (or green/grey) blotches and white veins, providing camouflage.
Distinction: Very similar to the Eastern Bath White (P. edusa); only genital analysis can definitively separate them in some regions.
