_Male._ Rather smaller than the female, much more closely punctured, and not so shining and smooth; the face with a transverse arched carina above the insertion of the antennae, which enters the emargination of the eyes; the clypeus strongly punctured; in other respects resembling the female. _Hab._ Aru. This species belongs to Guerin's division Liacos, of which _S. dimidiata_ is the type; the third discoidal cell is petiolated, the petiole entering the second submarginal about the middle. 4. SCOLIA INSULARIS. _S._ nitida nigra; abdomine prismatico, alis obscure fuscis cupreo submicantibus. _Male._ Length 7-9 lines. Shining black; head punctured, the vertex most finely and distinctly so. Thorax punctured, the disk of the mesothorax impunctate, the punctures wide apart on the scutellum and metathorax; the wings dark brown with a coppery iridescence, which has a remarkable dimness as if breathed upon. The basal segment of the abdomen strongly and closely punctured; the following segments more finely and distantly punctured, particularly the second and third segments. _Hab._ Key Island. 5. SCOLIA QUADRICEPS. _S._ nitida nigra; foeminae capite magno subquadrato, alis fuscis cupreo iridescentibus. _Female._ Length 6-8 lines. Black and shining; head subquadrate, smooth and shining, as wide as the thorax, with a few punctures at the sides of the face and between the antennae. Thorax finely punctured, with the disk of the mesothorax impunctate; wings dark brown with a rich coppery iridescence. Abdomen with a fine prismatic lustre, closely and strongly punctured towards the apex and at the extreme base, the second segment and the middle of the third with only a few very fine scattered punctures. _Hab._ Aru. This species also belongs to the division Liacos; the petiolated cell is small and oblong-quadrate; the male exactly resembles the female, except that its head is smaller and narrower than the thorax; the abdomen is rather more strongly punctured. Gen. POMPILUS, _Fabr._ 1. POMPILUS DUBIUS. _P._ niger, pilis mutabili-sericeis tectus; alis subhyalinis, apice nebuloso. _Female._ Length 4-1/4 lines. Black and covered with a thin changeable silvery pile, which is most dense on the sides of the metathorax and base of the segments of the abdomen. The vertex emarginate behind, the eyes very large, their inner orbits emarginate, reaching high on the sides of the head nearly to the margin of the vertex; the clypeus emarginate in front, the labrum produced. Thorax: the prothorax subelongate, narrowed anteriorly; the wings subhyaline, their apex clouded; the intermediate and posterior tibiae with a double row of spines; all the tarsi simple; the calcaria stout and elongate. Abdomen shining, with the margins of the segments slightly depressed. _Hab._ Aru. Subgen. AGENIA, _Schioedte_. 1. Agenia blanda, _Guer. Voy. Coq. Zool._ pt. 2. ii. p. 260. _Hab._ Celebes; India; Singapore; Malacca; Borneo; Key Island.