euphrosyne and selene
I usually distinguish them by a combination of two features
the v-shaped brackets bounding the inner part of the marginal band in euphrosyne are brown or brown-purple, in selene either black or dark brown
in this sense, this butterfly is selene
https://www.inaturalist.org/observations/120718640
in selene, in the space between C3 and M2, the postdiscal band is noticeably lighter than the zones located above and below this space, which are colored brown. While euphrosyne they are clearly going in a purple tone.
This sign is clearly visible from the link that I gave above (selena from Croatia)
We now take euphrosyne from Croatia
https://www.inaturalist.org/observations/29104459
the v-shaped brackets are clearly lighter than selena's,
the postdiscal sling is more uniform and goes not into brown, like the village, but into purple, which in general makes her euphrosyne.
When my father taught me butterflies, he said it was very easy to distinguish Euphrosyne from selena. Euphrosyne is purple, selena is yellow-cherry!
It's about UHW, of course!
And it is better not to pay attention to the spot in the center of the wing if other Clossiana (as in Siberia, for example) several more species are found.
A mother-of-pearl-silver spot is a confusing sign that often fails due to variability. In your part of Europe, it is better to distinguish them in the way I described above.
I hope my explanation didn't seem too confusing to you.
Best regards!
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