_Male._ Length 7 lines. Black; the head and thorax very closely punctured, thinly clothed with griseous pubescence, that on the face, thorax beneath, and on the coxae most dense and glittering; antennae more slender than is usual in this genus, and tapering to their apex, the joints slightly subarcuate; the mandibles bidentate at their apex and with a yellow spot at their base. Thorax: the posterior margin of the prothorax, a spot beneath the wings, the tegulae, and the postscutellum yellow; the anterior and intermediate tibiae ferruginous and more or less dusky above, the posterior pair ferruginous beneath. Abdomen shining, the margins of the segments deeply depressed; a small ovate spot on each side of the first segment, the second and three following segments with a narrow stripe on each side in the middle, yellow; the yellow markings obscure; the apical segment coarsely rugose; beneath, the segments are closely and strongly punctured. _Hab._ Aru. Gen. SCOLIA, _Fabr._ Division I. The anterior wings with two submarginal cells and two recurrent nervures. 1. Scolia grossa, _Burm. Abh. Nat. Ges. Halle_, i. p. 23. (Tiphia grossa, _Fabr. Syst. Piez._ p. 232. 4.) _Hab._ Aru; Java. The specimens of this species received from Aru are only 9 lines in length; I have examined others from Celebes, Borneo, India, and Java, showing every difference between 9 lines and 18 lines. Division II. Anterior wings with two submarginal cells and one recurrent nervure. 2. SCOLIA NITIDA. _S._ nitida, aterrima; alis aeneo et violaceo splendide micantibus. _Female._ Length 11 lines. Shining jet-black, the abdomen with prismatic tints. The flagellum fusco-ferruginous beneath, the mandibles ferruginous at their apex; the wings dark brown with a splendid lustre of coppery and golden tints mixed with shades of violet. The head with a few punctures behind the ocelli; the thorax with scattered punctures; the metathorax finely but not closely punctured; the disk of the mesothorax impunctate; the abdomen with fine scattered punctures; the apical segment opake, rugose, and with its apical margin pale testaceous; the abdomen beneath with strong distant punctures. _Hab._ Aru. 3. SCOLIA FULGIDIPENNIS. _S._ nitida, nigra; abdomine prismatico, alis fuscis viride et violaceo micantibus. _Female._ Length 12-13 lines. Jet-black, shining; head very smooth, the hinder margin of the vertex finely punctured, the face with a few fine scattered punctures; the flagellum obscurely rufo-fuscous. Thorax finely punctured, the disk of the mesothorax impunctate; wings dark brown with a splendid green iridescence, with violet tints towards their base; the legs thickly spinose and pubescent; the calcaria simple. Abdomen with scattered fine punctures; the apical segment densely clothed with black pubescence; beneath, with strong scattered punctures.