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This is Phimenes arcuatus.
It seems to be Subancistrocerus monstricornis.
This is Phimenes flavopictus flavopictus
This is Delta pyriforme philippinense.
This isn't a Masarinae, it's a Polistinae: Polistes dominula.
Polistes flavus is an American species so it can't be. In my opinion it could be P. hebridensis, a species endemic of Vanuatu.
This isn't a Belonogaster, it's a Delta sp. Maybe D. dimidiatipenne.
This is a Delta sp.
This is a Ropalidia. In Madagascar there are a lot of species that can be distinguished only examining specimens under microscope.
This isn't a Synagris, it's a Rhynchium marginellum sabulosum.