Zootaxa 4415 (1): 001–044 ISSN 1175-5326 (print edition) http://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2018 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4415.1.1 http://zoobank.org/urn:lsid:zoobank.org:pub:5DAA824F-BCBD-47FF-9948-F7EC45829AEB Australian Diplectroninae reviewed (Insecta: Trichoptera), with description of 21 new species, most referred to a new genus ALICE WELLS1 & ARTURS NEBOISS†2 1Australian National Insect Collection, CSIRO, PO Box 1700, Canberra, ACT 2601 Australia. E-mail: [email protected] †2Formerly Museum Victoria, Melbourne; deceased June 2010 TABLE OF CONTENTS ABSTRACT . 2 INTRODUCTION. 2 MATERIAL AND METHODS. 4 TAXONOMY . 5 Subfamily Diplectroninae . 5 Key to Australian genera of Diplectroninae . 6 Genus Diplectrona Westwood 1839 . 6 Diplectrona castanea (Kimmins, in Mosely & Kimmins 1953) . 7 Diplectrona inermis (Banks 1939) . 8 Diplectrona serrula (Neboiss 2003). 10 Diplectrona spinata (Banks 1939) . 10 Diplectrona tasmanica Jacquemart 1965 . 14 Diplectrona willandi sp. nov. 14 Genus Austropsyche Banks. 15 Austropsyche acuta sp. nov. 16 Austropsyche ambigua sp. nov.. 18 Austropsyche bifurcata (Kimmins, in Mosely & Kimmins 1953) . 19 Austropsyche kaputar sp. nov. 19 Austropsyche morana sp. nov. 20 Austropsyche victoriana Banks 1939 . 21 Genus Arcyphysa gen. nov. 22 Arcyphysa angusta Group. 25 Arcyphysa angusta (Banks 1939) . 25 Arcyphysa diamontona sp. nov. 27 Arcyphysa fraserensis sp. nov. 29 Arcyphysa hystricosa (Neboiss 1979). 29 Arcyphysa lovedayi sp. nov. 30 Arcyphysa naumanni sp. nov. 30 Arcyphysa rossi (Kimmins, in Mosely & Kimmins 1953) . .31 Arcyphysa satana (Mosely, in Mosely & Kimmins 1953) . .31 Arcyphysa hugginsi Group . 32 Arcyphysa candela sp. nov.. 32 Arcyphysa caldera sp. nov. 32 Arcyphysa carnarvona sp. nov.. 33 Arcyphysa crescentina sp. nov. 34 Arcyphysa hugginsi sp. nov. 34 Arcyphysa sybillae sp. nov. 35 Arcyphysa acmea Group . 37 Arcyphysa acmea sp. nov. 37 Arcyphysa anaplasis sp. nov. 37 Arcyphysa flinti sp. nov. 37 Arcyphysa nebo sp. nov. 38 Arcyphysa tortula sp. nov.. 38 Arcyphysa volsella sp. nov. 42 ACKNOWLEDGEMENTS . 43 REFERENCES . 43 Accepted by J. Morse: 7 Feb. 2018; published: 27 Apr. 2018 1 Licensed under a Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0 Abstract The history of studies on Australian caddisflies in the hydropsychid subfamily Diplectroninae is outlined against a broader background of uncertainties in the delineation of the worldwide type genus, Diplectrona Westwood. For the Australian fauna, keys are given to genera of Diplectroninae that occur in Australia and to adult males of species in Diplectrona (in- cluding a newly synonymised genus, Diemeniluma Neboiss), Austropsyche Banks, and Arcyphysa gen. nov. Of the 32 diplectronine species recognised, six are referred to each of Diplectrona and Austropsyche, among them one and four new- ly described species, respectively; and four established species are transferred from Diplectrona to Arcyphysa gen. nov., to join 16 newly described species. Diplectrona cognata Banks is synonymised with D. spinata Banks and Diplectrona bispinosa Jacquemart with Austropsyche victoriana Banks. Diagnoses and descriptions are accompanied by line drawings illustrating.