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Taygetis laches
Brown butterfly with one dark spot and several light ones.
Lacandon Rainforest.
Hi Luis, this was a tough one because of the missing upper wing. Anyway, it is what you can call the "Laches Satyr", Taygetis laches of the Family Satyridae which seems now to be a subfamily of the Nymphalidae as Satyrinae. It has a distribution from Mexico to northern Argentina. Here are some references:
http://www.botwf.org/page300.html
http://www.bio-nica.info/Ento/Lepido/Nym... (Scroll down for pictures)
http://en.wikipedia.org/wiki/Taygetis_la...
http://www.butterfliesofamerica.com/L/ta...