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Hessles, Hairstreak
Unusual for this area. Blew in from tropical storms, hurricanes.
On wildflower, Biden.
The hindwing white markings, and colors are more similar to 'Sweadner's' Juniper Hairstreak than to the Hessles hairstreak.
http://portugal.inaturalist.org/taxa/842...
http://portugal.inaturalist.org/taxa/840...
Butterflies are insects. Insects are classified under Arthropoda. Have corrected the category for you.