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Cuphotes sp.
Tenebrionidae, Cnodaloninae, Cuphotes sp. I would say. You are not so wrong with Erotylidae. Cuphotes is a Gibbifer-mimic, so Erotylidae-mimic.
http://www.perou-insectes.com/cuphotes-s...
http://www.boldsystems.org/index.php/Tax...