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Show 1882.] MR. W. L. DISTANT ON UNDESCRIBED CICADID^. 125 5. On some undescribed Cicadidae from the Australian and Pacific Regions. By W . L. DISTANT. [Eeceived January 13, 1882.] (Plate VII.) The species here described are almost wholly from the Museum Godeffro}* at Hamburg, the Rhynchotal collection of which I have been requested to determine by M r . Schmeltz. Australia is particularly rich in Cicadidae ; and from what little is known at present it probably possesses the greatest number of that family compared with any other region of the globe. Cyclochila, Fsal-toda, Henicopsaltria, Thopha, Cystosoma, and Chlorocysta are genera remarkable in structure, some extremely limited and none numerous in species and, so far as our present knowledge extends, completely confined to Australia; whilst the genus Melampsalta, though not altogether confined to that continent, is yet even now known to comprise a greater number of Australian species than can be found belonging to a genus in any other fauna. Two genera, Cicada and Tibicen, have almost a world-wide range, or are at least found in all the zoological regions. If we compare the distribution of the Australian Cicadidae with the geographical features of the botany of the same region, coincidences at once appear. Many affinities, as has been so ably pointed out by Dr. Hooker, exist between the South-African and Australian floras ; and genera are found common to these two regions which are found nowhere else. One very striking and parallel case may be mentioned in the Cicadidae. The Australian genus Cystosoma is strikingly dissimilar to the usual generic type in having a wonderfully inflated and dilated abdomen : in South Africa we find in this respect an analogous genus in Pydna. The extraordinary multiplicity of Australian species in the genus Melampsalta reflects the abundance of species in the genus Acacia as found in the same region. In the specific nomenclature I have largely used the names of Australian explorers, qualitative terms being an impossibility to provide for these insects, and more likely to obscure than to elucidate their differences. COSMOPSALTRIA STUARTI, n. sp. (Plate VII. figs. 2, 2a, 2b.) Body above pale greenish, sparingly pilose. Head with a spot on each lateral margin, and a smaller and rounded spot on each side of the ocelli, black; ocelli red margined with black; eyes dull ochraceous. Pronotum with two narrow, central, longitudinal fuscous fasciae, somewhat faint and obliterated about centre, more widely divergent on anterior margin, and joined together on the posterior margin; oblique strise behind eyes, and a spot on anterior inner border of lateral margin, also fuscous. Mesonotum with two central obconical spots mar- |