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Cactophagus sp.
about 3/4"
primary rainforest
This was the first of many weevils of all different sizes I spotted in Colombia.
Species level ID verified with genus revision. This is the predominant colour form of C. ornatus (Champion, 1910) in S-America.
(typical form from C-Am. resembles C. sinuatus)
Only two species of the genus live on Cactus - most feed on Bromeliads, epiphytic Arums, etc.
May be a variety of C. sinuatus:
http://www.naturalista.mx/taxa/500737
or a different species.