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Monodontomerus dentipes is decribed by Grissell as "unique in the subapical placement of the femoral tooth". I've created a crude image comparing the hind femur of your insect with that of dentipes, which seems to suggest that it is not that species. Another feature of dentipes is that the ovipositor is about 0.5 x length of the metasoma, which again is evidently not the case. There is no other species listed as parasitizing Diprionidae.

That probably doesn't help much but suggests you may be right in looking for an alternate host.