Monograph on the Cillaeinae (Coleoptera: Nitidulidae) from the Australian Region with comments on the taxonomy of the subfamily Author Kirejtshuk, Alexander G. Author Kovalev, Alexey V. 0000-0003-3328-8867 agk@zin.ru text Zootaxa 2022 2022-02-23 5103 1 1 133 journal article 112023 10.11646/zootaxa.5103.1.1 1bf32ba1-8e0d-4435-ba04-6d7dbd0d7238 1175-5326 6245709 9E1A72E7-3862-44F7-B69F-ECE64B239FF9 36. Key to species of Ithyphenes from Australia 1a. Pronotum slightly longer than head; anterior edge of frons tridentate; antennal grooves not expressed; anterior angles of mentum much longer (sides of mentum almost 4.0 × as long as its median part); apex of prosternal process about 3.0 × as wide as distance between procoxae; abdominal segments 5 and 6 almost 2.0 × wider than long; male pygidium about 1.3 × as long as wide and hypopygidium clearly transverse (about 0.7× as wide as long); 1a. Remarks. Antennal club less compact (antennomeres 9 and 10 rather separated). 5.5–7.8 mm . Figs 29 , A–K. Australia : QLD...................................................................................... I. marinae sp. nov. 1b. Pronotum about 1.5 × longer than head; anterior edge of frons bi-emarginate or subrectilinear; antennal grooves distinct; anterior angles of mentum much shorter (sides of mentum about 2.0 × as long as its median part); apex of prosternal process about 2.0 × as wide as distance between procoxae; abdominal segments 5 and 6 about 1.5 × as wide as long; male pygidium at least 1.5 × as long as wide and hypopygidium elongate or slightly transverse (about as long as wide)....... ............. 2 2a. Labrum rather exposed from under frons but oriented downwards and not visible from above; pronotum about 1.3 × as long as wide and more widening posteriorly; anterior part of frons subflattened and bi-emarginate at anterior edge; antennal club at least 2.0 × as long as wide, antenna somewhat longer than head wide and with club less compact (antennomeres 9 and 10 rather separated); inner side of antennal grooves quite distinct behind posterior level of eye; anterior angles of mentum somewhat shorter and wider; mesothoracic median plate distinctly isolated by longer lateral ridges; elytra somewhat longer than pronotum; exposed part of abdomen comparatively shorter and more narrowed apically; upper integument comparatively more finely, more shallowly and more sparsely punctured. 5.6–6.8 mm . Figs 28 , A–I. Australia : QLD, NSW............................................................................................. I. australiaensis sp. nov. 2b. Labrum slightly exposed from under frons and slightly declined, visible from above; pronotum almost 1.5 × as long as wide and less widening posteriorly; anterior part of frons somewhat roof-like (sloping at side) and subrectilinear; antennal club about 1.5 × as long as eye, antenna slightly shorter than head wide and with club more compact (antennomeres 9 and 10 slightly separated); inner side of antennal grooves obliterated behind posterior level of eye; anterior angles of mentum somewhat longer and narrower; mesothoracic median plate not completely isolated by shorter lateral ridges becoming obsolete anteriorly; elytra about as long as pronotum; exposed part of abdomen comparatively shorter and less narrowed apically (subparallel-sided); upper integument comparatively more coarsely, more deeply and more sparsely punctured. 4.8 mm . Figs 30 , A–H. Australia : NSW............................................................................... I. rectifrons sp. nov.