According to http://www.eurobutterflies.com:
"The range of this species (A. belia) has recently "lost" its European distribution. The European taxon euphenoides has been designated a new species in its own right". Hence my suggestion. The taxon Anthocharis belia euphenoides is sometimes still encountered for this species.
See:
http://www.eurobutterflies.com/species_pages/belia.htm
http://www.eurobutterflies.com/species_pages/euphenoides.htm
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