I'm sorry to say that Aniel is wrong on that one. This is definitely NOT H. affinis but indeed Canthon triangularis, as Klaas mentioned. Contrary to C. triangularis, H. affinis has no yellow on the body or legs, and its pronotum is shiny dark green. Both species are common in Suriname, and both belong in the family Scarabaeidae, subfamily Scarabaeinae and tribe Deltochilini.
Cheers, Auke