Sorry for the late answer. I had to took at least 10 more looks, but I think it is Prepona laertes octavia, probably the female, but for that I need to see the dorsal side. I had to rule out Prepona dexamenus first, which was a little bit tricky.
http://www.flickr.com/photos/91486426@N00/8540357928
http://www.prepona.info/images/Viktor%20Suter/Prepona%20laertes/male%20Peru%202000/Prepona%20laertes%20m.%20v.jpg
http://butterfliesofamerica.com/prepona_laertes_octavia_specimens2.htm
http://www.butterfliesofamerica.com/t/1998.htm
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