The Genus _Sextius_ contains five species, in which the prothorax is ridged in the centre and produced on either side into a rather short acute horn standing out on either side, and with the apical portion produced into a keeled spine extending to the tip of the abdomen. _Sextius virescens_, our commonest species, is of a delicate green colour, and feeds upon the sap of the black wattle and other species of Acacia. In early summer it may be found among the foliage in all stages of development; the trees they frequent are frequently infested with ants which come to obtain the honey dew. The female slits the bark with her ovipositor, and lays the eggs in rows. _S. depressus_, about the same size, slightly over ¼ of an inch in length, ranges from Western Australia to Queensland: at Kempsey, N.S.W., I obtained specimens on a slender leafed Acacia. It is of similar green colour to _S. virescens_, with the front of the thorax of a lighter tint, but the projecting horns are shorter and depressed, and the venation of the elytra is much finer. _S. australis_ is about the same size, and of a uniform black tint with a patch of bright silvery pubescence on the sides of the thorax, which is rounded in front and has very short blunt horns. It lives upon the branchlets of a prickly Hakea growing about Sydney. _Lubra spinicornis_ is a slightly smaller insect, of a general dull brown tint: it has the prothorax produced into two almost erect clubbed horns. Specimens have been obtained from Brisbane, Queensland, and the northern rivers of New South Wales. _Daunus tasmaniae_ is of the same chocolate brown colour; is more robust in proportion. The prothorax forms a regular hood swelling out on either side at the base of the tegmina, and the projecting horns are curved and deeply ridged, and are chisel-shaped at the tips. It is one of the commonest species in Tasmania, and is recorded over a wide area of the eastern mainland as far North as Brisbane. _Eufroggattia tuberculata_ is a rare insect usually found resting on a twig of a eucalyptus sapling, and is shaped very much like some of the small plant bugs belonging to the Genus _Testrica_; it is short and broad in form, with the head exposed; the thorax has short blunt horns; and the abdomen is broadly rounded at the apex. Family 4. Lantern-flies. FULGORIDAE. This is a very difficult family to satisfactorily define, as their members are very diverse in general shape and structure, with points of resemblance that bring some of the genera very close to the Cercopidae (from which however they differ in the shape of the head), while they somewhat resemble the Jassidae in the structure of the legs.