With no markings on the forewing and not very pronounced markings on the hindwing and the guessed smaller size, it might actually be Hesperocharis paranensis. Also in your area would be Hesperocharis anguitia (which has some stronger markings at the apices of the forewings and Hesperocharis erota (quite large, at least larger than the others, and also stronger and larger marking area on both fore- and hindwing). But this is something for a local expert...
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