Abstract
Two new species of Robertsia, R. weibleni and R. vaamondei are described from Papua New Guinea. Four species of Robertsia are now known from a single host fig tree species, Ficus xylosycia. Illustrations and keys are provided for both sexes of all four species. An online key is available at: http://www.figweb.org/Fig_wasps/Pteromalidae/Sycoecinae/Key/Robertsia.htm. Host relationships and biology are discussed.References
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