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Nathalis iole
When I approached for a closer photo it closed its wings for a better camouflage. Small butterfly 35 mm.
Semi desert
On second look, it appears that the marginal black spots are actually missing portions of the nearest forewing. Definitely a Dainty Sulphur.
It's a bit of an unusual specimen, given the marginal row of black spots on the forewing, but I don't know what else it could be.