The adults of the Australian Megaloptera 1

A key to the supraspecific taxa of the Australian Megaloptera, as recognized in this paper, is presented. Identification of species and subspecies is possible by comparison with illustrations of genitalia which are presented for all known forms. Their geographical ranges are quoted. Species status is proposed for phaeoscius Riek and polypastus Riek, both originally described as subspecies of Archichauliodes guttiferus (Walker). A new subgenus of Archichauliodes, Apochauliodes is erected. Stenosialis Tillyard is re‐instated. The adults of the following new taxa are described: Archichauliodes cervulus, A. collifer, A. conversus, A. cuspidatus, A. isolatus, A. lewis, A. neoguttiferus. A. pictus, A. piscator, A. rieki, A. simpsoni, A. uncinatus, Protochauliodes biconicus incertus, P. b. tooloomensis, P. kirramae, Austrosialis maxmouldsi, Stenosialis hollowayi. Also presented is the hitherto undescribed female of Archichauliodes phaeoscius Riek. Austrochauliodes Riek is regarded a junior synonym of Protochauliodes Weele. Archichauliodes australica Kimmins is synonymized with Archichauliodes anagaurus Riek. Five species groups are defined and proposed for the subdivision of Archichauliodes s. str.