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Good call Marta. I found a site that shows the subtle differences between the Brown argus and the female common blue.https://www.britishbutterflies.co.uk/components/downloads/cb-ba-id-guide-low-res.pdf . The configuration of the black dots does favor the Common blue(Polyommatus icarus).
Thank you Marta RubioTexeira
Looks to me like: https://es.wikipedia.org/wiki/Polyommatu...
Lat: 45.40, Long: 20.37
Spotted on Sep 3, 2017 Submitted on Sep 3, 2017
and 5 other people favorited this spotting