It isn't that unusual for butterflies to be reclassified from time to time. I usually refer to www.butterfliesandmoths.org as they tend to keep more abreast of any changes than wikipedia for instance. The site also has a regional search function which is handy for identification. They use the alternate scientific name for this species http://www.butterfliesandmoths.org/species/Aglais-milberti
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