This insect, a female, is 5 lines larger than _M. iridipennis_; but I can point out no other distinction beyond a slight difference in the colour of the wings: the specimen from Borneo has a metallic bluish-green iridescence, the Celebes insect has a violet iridescence; notwithstanding which I am inclined to regard them as one species. 2. MYGNIMIA FUMIPENNIS. _M._ aurantiaco-rubra, alis obscure fuscis. _Female._ Length 9 lines. Orange-red; the anterior margin of the clypeus entire; the labrum produced, its anterior margin widely emarginate; eyes large, black and ovate. Thorax: the posterior margin of the prothorax rounded; the mesothorax with a longitudinal fuscous stripe on each side, widest anteriorly; the metathorax truncate; above, transversely striate; the tibiae and tarsi spinose; wings dark fuscous, with a pale semitransparent macula at the base of the second discoidal cell and a dark fuscous macula beyond; the insect entirely covered with a fine orange-red downy pile. _Hab._ Celebes. Fam. SPHEGIDAE. 1. SPHEX PRAEDATOR. _S._ niger, rude punctatus, facie pube fulva vestita; alis fuscis cupreo iridescentibus. _Male._ Length 10-1/2 lines. Black; the head and thorax opake. Abdomen shining blue-black. The face with silvery pile on each side of the clypeus, and sprinkled with erect black hairs. Thorax: the posterior margin of the prothorax with a line of silvery pubescence; the metathorax with a short light-brown pubescence at the apex, and thinly clothed with black hairs; wings dark brown, with a brilliant violet iridescence. Abdomen blue-black, smooth and shining. _Hab._ Celebes. 2. AMMOPHILA INSOLATA. _A._ nigra, scapo mandibulis, pedibus, abdominisque segmentis primo et secundo ferrugineis; alis subhyalinis. _Female._ Length 8-1/2 lines. Black; the scape, the base of the flagellum beneath, the anterior margin of the clypeus and the mandibles ferruginous; the latter black at their apex. Thorax: the prothorax smooth and shining; the meso- and metathorax above transversely striated, the scutellum longitudinally so; the legs ferruginous, with their coxae black; a spot of silvery-white pubescence on each side of the metathorax at its base, and two at its apex close to the insertion of the petiole; the wings fulvo-hyaline with the nervures ferruginous. Abdomen: the petiole and the following segment red, the base of the third also slightly red; the three apical segments obscurely blue, with a thin glittering pile. The _male_ differs in having the legs black, their articulations only being ferruginous; the head entirely black with the face densely covered with silvery-white pile. The thorax is sculptured as in the other sex; the petiole more elongate and slender, the basal joint black, the second and the first segment ferruginous beneath; the rest of the abdomen blue. _Hab._ Celebes. Gen. PELOPAEUS, _Latr._ 1. Pelopaeus Madraspatanus, _Fabr. Syst. Piez._ p. 203. 3. _Hab._ Malabar, Madras, Nepaul, Bengal, Celebes.