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Charidotella sexpunctata
0.5 cm long bug, light blue-metallic gold color.
Tropical forest -altitude 1800 mts-
Charidotella sexpunctata is listed as present in the Costa Rica Biodiversity Portal http://www.crbio.cr/portalCRBio/species/...
This is a Tortoise Beetle. I'm not an expert, and not familiar with all the species that may be in Costa Rica, but I'm fairly certain it is a member of the Subgenus Charidotella.
http://bugguide.net/node/view/633889