Walker described a number of Australian species in the British Museum Catalogue, Hymenoptera 1846, others in his Monograph of the family 1839, and the Proceedings of other Journals (1863, &c.); but his usual locality is simply “New Holland,” and without access to the types one would have some difficulty in determining any species. Westwood obtained and figured some of our largest; and Haliday others in the “Entomologist” 1842; while the few others described are those obtained by the zoologists on the various scientific expeditions visiting this country. Ashmead has contributed the only modern paper (Pro. Linn. Society N.S.W. 1900) on these and other parasitic hymenoptera collected by Mr. Koebele and myself. The species in the Genus _Leucaspis_ are large thickset chalcids, with the ovipositor curving round and fitting into grooves in the dorsal surface of the abdomen. _Leucaspis darlingi_ was obtained by Westwood from the Darling Downs Queensland (I have specimens from Mackay Q.): it is black mottled with yellow, and has brownish wings; the hind legs are swollen: the antennae thickened; and it measures ½ an inch. _L. australis_ was obtained by Walker from S. Australia. Nothing is known about their habits, but _Leucaspis gigas_ in Europe lays its eggs in the nests of mud-dauber wasps, piercing the clay walls with its stout ovipositor. _Trichoxenia cineraria_, a slightly smaller black insect, is deeply punctured all over the dorsal surface of the head and thorax; the wings are clouded at the apex; and the upper surface of the body is thickly clothed with dense yellow down, thickest toward the apex. Specimens in my collection were taken about Sydney.