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Black-veined White

Aporia crataegi

  • Family: Whites and Yellows – Pieridae
  • Subfamily: Whites – Pierinae
  • Wing span: Large, 51–70 mm (2.01–2.76 in.). Females larger than males.
  • Wing upper side: Translucent white, wing veins black (male) or dark brown (female).
  • Wing underside: Like upper surface.
  • Habitat: Open forest and grazing land.
  • Flying time: Mid-June–mid-July.
  • Overwintering form: Caterpillar.
  • Larval foodplant: Rowan (Prunus padus), bird cherry (Prunus padus), hawthorns (Crataegus), apple tree (Malus domestica) and other Rose family (Rosaceae) trees and bushes.

Black-veined whites are quite rare in Finland and variations in the size of population are quite large. The black-veined white is the only blotchless white butterfly species in Finland. The only markings on its wings are its black veins. It is also the largest member of the Pierinae subfamily in Finland.

Black-veined whites are social and appear in large groups, often sucking moisture from damp roads. The females lay their eggs in groups of 30–100 among the leaves of the host plant. The caterpillars live in large groups and overwinter as a colony in a cocoon among entwined leaves. The abundance of the species varies greatly from year to year.

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