1. TRYPOXYLON EXIMIUM. _T._ nigrum; clypeo argentato-pubescente; abdominis segmentis secundo tertio quartoque basi rubris; alis hyalinis. _Female._ Length 8-1/2 lines. Black, smooth, and shining; the head and thorax very delicately punctured; the face and clypeus below the insertion of the antennae densely covered with silvery-white pubescence; the anterior margin of the clypeus rounded and much produced, with a slight curving upwards at its margin; the mandibles yellow, with their apex ferruginous; the palpi pale testaceous; the inner orbits of the eyes very deeply notched. Thorax: the metathorax, the sides, and beneath with a thin silvery-white pubescence, most dense on the former; the metathorax not distinctly enclosed at its base, but with two shallow impressed lines, which mark the form of the usual enclosed space; a central longitudinal channel extends from its base to the apex, slightly subinterrupted in the middle; the wings hyaline and iridescent, the nervures dark fuscous; the anterior and intermediate tibiae in front, their tarsi, the apical joints of the posterior pair, and the base of the tibiae very pale ferruginous; the claw-joint of the intermediate and posterior tarsi fuscous above; the calcaria pale testaceous. Abdomen, the second, third, and base of the fourth segment more or less ferruginous; the apex of the basal petiolated joint ferruginous beneath. _Hab._ Aru and Key Island. Gen. CRABRO, _Fabr._ 1. CRABRO SOLITARIUS. _C._ niger; abdomine petiolato; scapo flagellique articulo ultimo, collari, tuberculis, postscutelli maculis duabus flavis; pedibus petioloque basi ferrugineis. _Female._ Length 5 lines. Black and opake; the head large, quadrate, and wider than the thorax; the ocelli in a curve on the vertex; the clypeus covered with silvery pubescence, carinated in the middle, and slightly produced; the scape and basal joint of the flagellum pale yellow. Thorax: an interrupted line on the collar, the tubercles, a spot beneath the wings, and two minute ones on the postscutellum yellow; the disk of the thorax longitudinally delicately rugose; the metathorax oliquely striated, with an enclosed space at its base, and having a central longitudinal channel, the side covered with thin silvery pubescence; the wings hyaline and iridescent, the nervures fuscous; the legs ferruginous, variegated with yellow. Abdomen: the basal petiolated segment ferruginous, with its apical half black above; the apical segment with an angular shape at its base, which is smooth and shining, with its lateral margins carinate, the extreme apex ferruginous; beneath smooth and shining, with the apical margins rufo-piceous. _Hab._ Aru. This species would, according to the views of some Hymenopterists, belong to the genus _Rhopalum_ of Kirby. Group SOLITARY WASPS. Fam. EUMENIDAE, _Westw._ Gen. EUMENES, _Latr._ 1. Eumenes arcuata, _Fabr. Syst. Piez._ 287. 11. _Hab._ Key Island; coast of New Guinea (Triton Bay); Australia.