Australian Marsh Beetles (Coleoptera: Scirtidae). 7. Genus Nothocyphon, new genus Author Zwick, Peter text Zootaxa 2015 3981 3 301 359 journal article 10.11646/zootaxa.3981.3.1 13ca0acb-0db1-4ee9-bb85-a90cdc65dcf3 1175-5326 240978 34F39733-E55C-4695-8749-E6811F675740 Key to males of the lindensis -group 1 A large hollow cone-like spine between penis and S9 (e.g., Figs. 12 , 19 ). Yellow or light brown beetles with a brown spot close to the suture near the top of elytra ( Fig. 165 ), rarely more extended maculae ( Fig. 166 )............................... 2 1' Groups of slender spines between penis and S9 (Figs. 26, 29). Brown beetles...................................... 5 2 Parameres enveloping the penis, one or two huge curved spines along their medioventral edge ( Figs. 10, 11 )............. 3 2' Parameres slender, lying alongside penis, not surrounding it.................................................... 4 3 Apex of trigonium entire, with spines in irregular dorsoventral rows ( Figs. 8−10 )................ N. lindensis (Blackburn) 3' Trigonium forked, the hollow spine visible between the short branches ( Figs. 12, 13 ).................... N. ypsilon n. sp. 4 Trigonium truncate, short, with curved lateral horns ( Fig. 18 )....................................... N. taurus n. sp. 4' Trigonium deeply excised, each lobe medially with many spinules ( Fig. 24 )......................... N. banksiae n. sp. 5 Notch in trigonium deeper than wide. Each lobe of S9 with a rounded notch. A single triangular patch of spines, parameres with strong teeth (Fig. 26).............................................................. N. donnabuangi n. sp. 5' Notch of trigonium shallower, wider than deep. Caudal lobes of S9 not notched. Paired spinule patches, parameres with fine teeth (Fig. 29)........................................................................... N. imitator n. sp.