Carol21

Thank you, to bayucca, for ID of this Passalidae.

Thank you Paul Davis for ID information
and thank you Mark Ridgway for alerting me to my incorrect pin location. This weevil was in the Monteverde Biological Reserve, Costa Rica (not the Indian Ocean).

The little "feelers" are called halteres. In the Order Diptera (flies) they are modified hindwings and act as balance and guidance system. This explanation is on Wikipedia.