Pearl-bordered Fritillary
Boloria (Clossiana) euphrosyne

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Boloria euphrosyne

Male, Switzerland, May 2014

Boloria euphrosyne

Female, Switzerland, May 2014

Boloria euphrosyne

Male, Switzerland, June 2014

Boloria euphrosyne

Switzerland, August 2014

Boloria euphrosyne

Female, Switzerland, July 2013

Boloria euphrosyne

Male, Switzerland, June 2013

Boloria euphrosyne

Female, Switzerland, June 2012

Switzerland, May 2005

Switzerland, May 2005

Switzerland, June 2009


Taking minerals, Switzerland, May 2009



At bugle, its favourite plant. Switzerland, May 2009.

This species is very similar to the small pearl-bordered fritillary but in my experience is more strictly a woodland species (though their habitats do overlap). The classic diagnostic feature is the single pearl in the middle of the underside hindwing, with yellow spots in the rest of the band. This is clearly visible in the second picture above. Other points of distinction are the very reddish underside and the yellow ring around the black spot in the cell of the underside hindwing.

In England this used to be called the April fritillary, though it rarely if ever flies in April there - possibly this was a throwback to the Julian calendar! The small pearl-bordered fritillary flies a little later and was called the May fritillary. In the wood where I photographed the first two above, small pearl-bordered does certainly succeed pearl-bordered as the year goes on.