(“Agricultural Gazette,” N.S.W.)] The Genus _Chlorocysta_ contains two curious pale green insects with vitreous tegmina and wings, the former much more closely reticulated than the ordinary cicada, with many cross and parallel nervures. The head is small, and the body of the male is swollen and cylindrical. _Chlorocysta vitripennis_ was described by Westwood (Ann. Nat. Hist. 1851); the larger male measures slightly over 2 inches across the wings. The female is greenish or reddish, the abdomen conical but not inflated. They frequent low scrub; the southern forms found about the Tweed River, N.S.W., are green or yellowish; those from North Queensland quite brown. _Glaucopsaltria viridis_, described by Goding and me from S. Queensland, is placed by Distant in this genus. [Illustration: =Fig. 158.=--Section of stem of eucalyptus, in which the Black Cicada (_Psaltoda moerens_) has laid her eggs.] The Genus _Melampsalta_ contains a great number of our small black or dark brown cicadas often marked with orange red or dull yellow. The members of the genus are found over Asia, Africa and Europe, over 40 are described from Australia, and 7 from New Zealand. Some species are very numerous in early summer, and are known as “Squeakers” on account of their musical notes. _Melampsalta torrida_, originally described by Erichson from Tasmania, has a wide range round from Queensland to W. Australia. It is almost black, with several light marks in the centre of the thorax, and two irregular rounded confluent black spots at the tips of the tegmina. It measures about two inches across the wings, but is variable both in size and in the wing markings. _M. abdominalis_, about the same size, is black, with two lines of reddish yellow on the apical portion of the dorsal surface of the abdomen, and the under surface red; when the tegmina are closed there is a distinctive opaline mark on either side. It is common in S. Australia and N.S.W. _M. eyrei_ is a much smaller species, with the head and thorax black, lined with yellow, and the whole of the abdomen except the black tip, bright yellow; it is common in N. Queensland. The members of the Genus _Pauropsalta_ are easily distinguished from those of the previous group by having five apical areas in the wings, while the former have six. Sixteen species are described from Australia. _Pauropsalta encaustica_ is our commonest species with a very wide range over Australia; it is of a uniform black tint, with faint pale brown marks on the head and prothorax, and an infuscated patch on the hind margins of the wings; the abdominal segments are finely ringed with white to reddish brown. _P. annulata_ is a synonym of this cicada. _P. nodicosta_ is a small brown species from Kalgoorlie, W.A., with a curious node in the centre of the costal nervure of the tegmina. _P. mneme_, larger, and broader than _P. encaustica_, has the abdominal segments richly edged with red. It is common on the Blue Mountains, N.S.W.