Ithyphenes, Murray, 1864

Kirejtshuk, Alexander G. & Kovalev, Alexey V., 2022, Monograph on the Cillaeinae (Coleoptera: Nitidulidae) from the Australian Region with comments on the taxonomy of the subfamily, Zootaxa 5103 (1), pp. 1-133 : 93

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.

Figures

FIGURE 28. Ithyphenes australiensis sp. nov., orig. A–D, F–H: holotype, male from NSW (“3 km N of Landsowne …”); E, I: paratype from QLD (“… Cape Tribulation…”); A: body, dorsal; B: head, dorsal; C: head, ventral; D: thorax, ventral; E: terminal abdominal segment, ventral; F: male anal sclerite, ventral; G: tegmen, ventral; H: penis trunk, dorsal; I: ovipositor, ventral. Scale bars: a = 1.0 mm to Fig. A; b = 0.5 mm to Figs B–E; с = 0.25 mm to Figs F–I.

FIGURE 29. Ithyphenes marinae sp. nov., orig. A–G, I–K: holotype, male from QLD (“… Iron Range…”); H, J: paratype, male from QLD (“… 9 km ENE of Mt. Tozer…”); A: body, dorsal; B: head, dorsal; C: head, ventral; D: thorax, ventral; E: terminal abdominal segment, ventral; F: male anal sclerite and spiculum gastrale, ventral; G–H: tegmen, ventral; I–J: penis trunk, dorsal; K: proximal part of inner sac with armature. Scale bars: a = 1.0 mm to Fig. A; b = 1.0 mm to Figs B–E; с = 0.25 mm to Figs F–K.

FIGURE 30. Ithyphenes rectifrons sp. nov., orig. Holotype, male from MSW (“… Umumgar S.F.…”); A: body, dorsal; B: head, dorsal; C: head and prothorax, ventral; D: terminal abdominal segment, ventral; E male anal sclerite and spiculum gastrale, ventral; F: tegmen, ventral; G: penis trunk, dorsal; H: proximal part of inner sac with armature. Scale bars: a = 1.0 mm to Fig. A; b = 0.5 mm to Figs B–D; с = 0.25 mm to Figs E–H.