wingspan : male 50/55, female 55/60 mm
Eresia datis (formerly Eresia moesta) flies from Colombia to Peru (d’Abrera 1987) ; this butterfly is a Nymphalid which looks like some Ithomiids.
this species has many different and sympatric forms ; f. fassli is uncommon, and today fassli would be a ssp of datis ? it does not sound very convincing...
seen at rio San Luis, near Mera.