Revision of the Australian planthopper genus Monomalpha Emeljanov with the description of the new genus Latissima (Hemiptera: Auchenorrhyncha: Fulgoromorpha: Cixiidae: Cixiini).

The Australian planthopper genus Monomalpha Emeljanov, 2000 is reviewed. Males of M. gratiosa Emeljanov, 2000, a species originally described from a single female specimen, are presented for the first time. A new species, M. stenocara from Queensland is described. Together with the type species M. gratiosa, recorded from Queensland and mainland NSW, and M. fletcheri Emeljanov, 2000, a species endemic to Lord Howe Island (New South Wales) there are now three species recognised in the genus Monomalpha. A new endemic genus, Latissima gen. nov., is created within Cixiini to accommodate a new species from Queensland, Latissima isleyensis sp. nov. Identification keys to the genera of Australian Cixiini and to the species of Monomalpha are presented and host plant relationships discussed, including the first record of an Australian cixiid from the tree fern family Cyatheaceae.

Revision of the Australian planthopper genus Chidaea Emeljanov with a redescription of Cixius sidnicus Stål, 1859 (Hemiptera: Auchenorrhyncha: Fulgoromorpha: Cixiidae).

As part of the ongoing revision of the Australian Cixiidae, here we revise the endemic genus Chidaea Emeljanov, 2000. Examination of the holotype of Cixius sidnicus Stål, 1859 revealed that it is not congeneric with Cixius nervosus (Linnaeus, 1758) but belongs to the hitherto monotypic genus Chidaea resulting in the new combination Chidaea sidnicus (Stål, 1859). Chidaea dayi Emeljanov, 2000 is redescribed and thirteen new species are described: Chidaea algida sp. nov., Ch. armidalensis sp. nov., Ch. belairensis sp. nov., Ch. bobadeenensis sp. nov., Ch. carinata sp. nov., Ch. crassa sp. nov., Ch. dickinsonorum sp. nov., Ch. etelis sp. nov., Ch. kimbaensis sp. nov., Ch. orangensis sp. nov., Ch. pulyonna sp. nov., Ch. punctata sp. nov., and Ch. wilarra sp. nov. An identification key to species of Chidaea and to Australian genera of Cixiini is presented. Host plant relationships and distribution are discussed. Chidaea is endemic to Australia and occurs in all states and territories apart from the Northern Territory.

Revision of the Australian species of Aka White, 1879 (Fulgoromorpha: Cixiidae) with the description of a new genus.

The Australian species of the genus Aka White are revised. Seven new species are described: A. balma sp. nov., A. dobsonensis sp. nov., A. gwana sp. nov., A. issidopsis sp. nov., A. kuraka sp. nov., A. pirri sp. nov., A. sorellensis sp. nov. Adding to those the 5 species solely occurring in New Zealand, we have a total number of 14 species in Aka. The types of A. hardyi Muir, 1931 and part of the type series including the holotype of A. tasmani Muir, 1931 are declared lost. However, based on the original descriptions and the remaining type material, these species have been matched with new material examined and are redescribed in this paper. Neotypes are designated for A. hardyi and A. tasmani. A new monotypic genus Yanganaka gen. nov. is described from Australia. Based on characters such as the general shape of the body as well as a forked frontal carina it appears to be closely related to Aka and the New Zealand genus Chathamaka Larivière, 1999. Yanganaka ariecornia sp. nov. is described and illustrated. An identification key to differentiate between the two genera occurring in Australia, Aka and Yanganaka, is provided. Information on how to distinguish Chathamaka from the latter two genera, as well as a key to identify all Australian species of Aka is presented. Host plant associations are discussed which support the hypothesis that Aka is a Gondwanan relict.

Taxonomic revision of Calamister Kirkaldy, 1906 (Fulgoromorpha: Cixiidae) with the description of a new species.

Calamister obscurus Kirkaldy, 1906 is redescribed, illustrated and a lectotype designated from the type series. A new species, C. cougalensis, is added to the genus. An identification key is provided and morphological characters discussed. Doubts are raised about a specimen published as C. obscurus by Jacobi (1928).