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Non-pollinating fig wasps (NPFWs), particularly long-ovipositored Sycoryctina wasps, exhibit a high species specificity and exert complex ecological effects on the obligate mutualism between the plant genus <i>Ficus</i> and pollinating fig wasps. <i>Apocrypta</i> is a genus of NPFWs that mostly interacts with the <i>Ficus</i> species under the subgenus <i>Sycomorus</i>, and the symbiosis case between <i>Apocrypta</i> and <i>F. pedunculosa</i> var. <i>mearnsii</i>, a <i>Ficus</i> species under subgenus <i>Ficus</i>, is unique. As fig’s internal environments and the wasp communities are distinct between the two subgenera, we addressed the following two questions: (1) Are the parasitism features of the <i>Apocrypta</i> wasp associated with <i>F. pedunculosa</i> var. <i>mearnsii</i> different from those of other congeneric species? (2) Is this <i>Apocrypta</i> species an efficient wasp that lives in its unique host? Our observation revealed that this wasp is an endoparasitic idiobiont parasitoid, as most congeneric species are, but developed a relatively long ovipositor. Furthermore, the relationships of the parasitism rate versus the pollinator number, the fig wall, and the sex ratio of the pollinator, respectively, showed that it possessed a higher parasitism ability than that of other congeners. However, its parasitism rate was low, and thus it was not an efficient wasp in its habitat. This difference between parasitism ability and parasitism rate might be a consequence of its oviposition strategy and the severe habitat conditions. These findings may also provide insights into the mechanism to maintain the interaction between the fig tree and the fig wasp community.