Australian Diplectroninae reviewed (Insecta: Trichoptera), with description of 21 new species, most referred to a new genus Author Wells, Alice Author Contents, Arturs Neboiss Table Of text Zootaxa 2018 2018-04-27 4415 1 1 44 journal article 30163 10.11646/zootaxa.4415.1.1 c803bce9-4469-43db-8acd-8291d035b6a2 1175-5326 1241736 5DAA824F-BCBD-47FF-9948-F7EC45829AEB Key to males of species of Arcyphysa 1 Apicolateral processes length at least 4x length of coxopodites of gonopods ( Figs 144–145 )....... Arcyphysa nebo sp. nov . -. Apicolateral processes length less than 4x length of coxopodites................................................ 2 2(1) Gonopods with coxopodites in lateral view subquadrate to irregularly stout, with length equal to or less than 2x width (e.g., Figs 133, 137, 139 ).................................................................................... 3 -. Gonopods with coxopodites in lateral view more or less rectangular or rod-shaped, with length exceeding 2x maximum width (e.g., 105, 118, 129)................................................................................... 7 3 (2) In ventral view, apicolateral processes on segment IX strongly curved, distally club-shaped ( Fig. 134 ), coxopodites triangular; in lateral view, coxopodites sub-quadrilateral ( Fig. 135 )................................ Arcyphysa anaplasis sp. nov . -. In ventral view, apicolateral processes tapered to acute apices or narrowly rounded apically, shape of coxopodites varied, not triangular in ventral view and sub-quadrangular in lateral view.................................................. 3 4(3) Harpagones each single, tapered ( Fig. 141 )........................................... Arcyphysa volsella sp. nov . -. Harpagones each distinctly bilobed (e.g., Figs 132, 136 )....................................................... 5 5(4) Coxopodites of gonopods sub-rectangular in ventral and lateral views ( Figs 132–133 )........... Arcyphysa acmea sp. nov . -. Coxopodites of gonopods triangular in ventral view ( Figs 136, 138 ).............................................. 6 6(5) Apicolateral processes on segment IX twisted, sinuous ( Figs 136–137 )....................... Arcyphysa tortula sp. nov . -. Apicolateral processes on segment IX not as above ( Figs 138–139 )........................... Arcyphysa flinti sp. nov . 7(2) Phallic apparatus with parameres visible towards base; harpagones usually sharply and shallowly bifid apically (e.g., Figs 117, 122 )............................................................................................... 8 -. Phallic apparatus without parameres; harpagones never bifid apically, sometimes cup- or spatula-shaped (e.g., Figs 104 , 110)................................................................................................... 12 8(7) Ventral lobe of each apicolateral process on segment IX elaborately crescent-shaped in lateral view, with curves lined with spe- cialised setae ( Figs 118, 120 )........................................................................... 9 -. Ventral lobe of each apicolateral process not as above...................................................... 10 9(8) Apicolateral processes in lateral view bilobed, each with ventralmost lobe loosely crescent-shaped; tergite X covered with dense microtrichia ( Fig. 118 )....................................................... Arcyphysa caldera sp. nov .