Click HERE for excellent maps of the distribution of butterflies in Switzerland. All the species are here, though some are listed under different genera from the taxonomy I use in these pages. For instance, Everes argiades is listed as Cupido argiades. If you can't find a butterfly where you expect, look in related genera.
The maps cover many other taxonomic groups of Swiss fauna. To find the butterflies, select 'RHOPALOCERA' in the list of taxonomic groups. Then enter the genus and species required.