_Female._ Length 5 lines. Black; the joints of the antennae, from the 6th to 13th, white, the vertex also white. Thorax: a spot in the middle of the disk of the mesothorax, the scutellum, a spot on the postscutellum, two beneath the wings, the apex of the metathorax, and a spot on each side white; the legs white, the anterior pair slightly fuscous above; the intermediate femora and tibiae beneath, and the tarsi above, black; the posterior femora above and beneath the tibiae, except their extreme base and the base and apex of the tarsi, black; wings hyaline, the nervures black. Abdomen: the apical margins of the segments, excepting the fourth and fifth, with white fasciae, the second and third fasciae attenuated in the middle. _Hab._ Aru. 3. MESOSTENUS ALBOPICTUS. _M._ niger, albo varius; alis hyalinis. _Female._ Length 7 lines. Black; the clypeus, mandibles, palpi, the joints of the antennae from the sixth to the thirteenth, and a broad stripe at the inner orbits of the eyes white. Thorax: an ovate spot on each side of the prothorax above, a similar spot in the middle of the mesothorax, the tegulae, scutellum and postscutellum, a T-shaped spot reversed on the metathorax, a large quadrate one on its sides, three irregular-shaped maculae beneath the wings, and the anterior and intermediate legs white, the legs with a black line above; the posterior legs have a large spot on the coxae behind, the trochanters, the tibiae, and tarsi white, the tibiae black at their apex, and the femora palish at their base outside; the wings hyaline and iridescent, with the nervures black. The abdomen beneath, and the apical margins of the segments above, white. _Male._ Rather smaller than the female, but only differs otherwise in the colour of the legs, the anterior and intermediate pairs being entirely yellowish-white, excepting the intermediate tibiae and tarsi, which are slightly fuscous above; the posterior femora are ferruginous, the tibiae and tarsi white, with the base and apex of the two former black as well as the apical joint of the tarsi. _Hab._ Key Island. Gen. PIMPLA, _Fabr._ 1. PIMPLA OCHRACEA. _P._ ochracea; antennis ferrugineis; facie lutea; alis hyalinis, apice fuscis. _Female._ Length 5 lines. Entirely ochraceous, with the face and scape in front yellow; the body beneath is pale ochraceous; the antennae ferruginous, above dusky; the eyes emarginate within; the tarsi have the tips of the claws black; the wings flavo-hyaline, with the apex of the anterior pair fuscous, the nervures black, becoming yellow at the base of the wings. The head, thorax, legs and base of the abdomen smooth and shining; the abdomen, except at the base, finely punctured; a transverse impressed row of punctures a little before the apical margin of each segment, and the space between impunctate. _Hab._ Aru. 2. PIMPLA BRACONOIDES. _P._ rufo-flava; antennis tarsisque et abdominis dimidio posteriori nigris; alis fuscis, dimidio basali flavis.