Bolbochromus (Metabolbochromus) sulcicollis (Wiedemann, 1819)

Krikken, Jan & Li, Chun-Lin, 2013, Taxonomy of the Oriental genus Bolbochromus: a generic overview and descriptions of four new species (Coleoptera: Geotrupidae: Bolboceratinae), Zootaxa 3731 (4), pp. 495-519 : 516

Bolbochromus (Metabolbochromus) sulcicollis (Wiedemann, 1819)

( Figs. 17–18 , 41, 58–59)

Identification. Clypeogenal angles as well as clypeal apex distinctly tuberculate, i.e., clypeus actually trituberculate along its outer margin. Pronotum and scutellum usually largely black or dark brown, pronotal sides with two more or less contiguous brown markings; elytra with shallowly impressed striae, usually medium-brown (castaneous, lacking discrete lighter markings), more convex interstria 1 may be infuscate; pronotum and elytra occasionally uniformly black(-brown), on the other hand, generally much lighter specimens also occur. Apicomedian tubercle of clypeus and postfrontal tubercle long in major individuals. Median sulcus of pronotum distinct, adjacent surface on either side convex, anteromedian surface slightly, broadly depressed (occasionally slightly deplanate, Fig. 18 ). Body length usually 8.5–11.5 mm.

Distribution. Indonesia: Java, Sulawesi, islands off southeast Sumatra (! Belitung), possibly elsewhere in Sundaland.

Figures

FIGURES 17 – 24. Habitus of male Bolbochromus (oblique and lateral views). 17 – 18, B. sulcicollis; 19 – 20, B. ludekingi; 21 – 22, B. walshi; 23 – 24, B. laetus or near. Scale lines 1 mm.