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wingspan :
Cantha sp, close to, but different from, Cantha calva, at the start of the Canelos road.
Andrew Neild took a picture of the same butterfly on the Apuya track, Napo ; hence it should be an undescribed species.
https://www.noreste.eu/en/fiche-papillon/025-Hesperiidae/003-Hesperiinae/006-Moncini/007-Cantha/011-calva+resembling/_