Sorry, there is even a 3rd one: Leucochimona molina:
http://butterfliesofamerica.com/imagehtmls/Riodinidae/Leucochimona_molina_SYNTYPE-HOLOTYPE_of_Mesosemia_lagora-ECUADOR_BMNH-E-810390-BMNH-3_i.htm
Personally I cannot separate them for sure, I would go with Leucochimona sp. as scientific ID.
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