Mecynorrhina, Fornasinius and Hegemus belonging to the tribe Goliathini. The Goliathini is a large tribe with about 80 genera that are found mostly in Africa.
This tribe includes very big beetles like Goliathus goliatus, which is one of the heaviest actively flying insects.
For flight, the elytra are not lifted, which is special for some Goliathini.