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.

Published as part of Zwick, Peter, 2015, Australian Marsh Beetles (Coleoptera: Scirtidae). 7. Genus Nothocyphon, new genus, pp. 301-359 in Zootaxa 3981 (3) on pages 306-307, DOI: 10.11646/zootaxa.3981.3.1, http://zenodo.org/record/240978