These insects are minute froghopper-like forms with the head rounded in front, and with the body tapering towards the tips of the tegmina. The head is large, with the oval or rounded eyes projecting on the sides, and with a pair of ocelli situated on the front margin. The antennae, bristle-like, of considerable length, are each composed of two short cylindrical basal joints with a thread-like terminal portion, and are placed in front and below the eyes. The legs are long, well adapted for jumping (their chief means of progression); and the tibiae of the hind pair are thickly clothed with stout spines. Though these insects are very small, many species appear upon crops and herbage in such immense numbers that they often do a great deal of damage, and are very interesting from an economic standpoint. In Japan, for instance, there are several species very serious pests in the rice fields; while in North America _Erythroneura vitis_ is a well-known pest upon the foliage of vines. They are abundant on the low scrub and grass lands in this country in favourable localities, and may be easily collected with a sweeping net, or by shaking the bushes over an open umbrella; yet, probably on account of their small size and retiring habits, few specimens are to be found even in our Museum collections. The sugar-cane hopper, _Perkinsiella saccharicida_, a native of Queensland, is a dull brownish yellow hopper with a dark parallel stripe down the centre of the basal portions of the tegmina; it measures a ¼ of an inch in length. Kirkaldy described it from Hawaii, where it has been introduced, and is a serious pest to the sugar-cane. A very pretty little unidentified species, bright red and yellow, with the fore wings marked with dark brown, is common upon the broad soft leaves of _Eucalyptus robusta_, where the curious little larvae rest in families of three or four; each is enveloped in white filaments which proceed from round the tip of the abdomen. The larvae of another species have been observed to form large colonies on the surface of the leaves of low eucalyptus bushes on the hills near Capertee N.S.W. They suck up the sap, discolouring the centre of the leaves; each exudes a globule of liquid from the tip of the abdomen, which they drag out into thin threads with their hind legs, to form a spider-web-like covering over their bodies, and this web dries soon after the leaves are gathered. Family 6. Lerp Insects. PSYLLIDAE.