Bolbochromus (Bolbochromus) hirokawai Ochi, Kon & Kawahara, 2010

Li, Chun-Lin, Krikken, Jan & Wang, Chuan-Chan, 2019, Review of the genus Bolbochromus (Coleoptera, Scarabaeoidea, Geotrupidae, Bolboceratinae) in the Philippines, ZooKeys 842, pp. 135-152 : 135

Bolbochromus (Bolbochromus) hirokawai Ochi, Kon & Kawahara, 2010 Figs 3, 4, 14

Material examined.

Mt. Canlaon Negros Is. PHILIPPINES, XII. 1988 (1 female at National Museum of Nature & Science, Tsukuba, Japan).

Diagnosis.

A distinct large Bolbochromus species that can be separated from other congeners by the following combination of characters: body length 9.0-10.4 mm; dorsum brown to blackish brown, head, scutellum and elytral suture blackish brown, sides of pronotal midline varied (Fig. 3, 4, 14); eyes small, canthus wide and simple; anterior margin of clypeus beaded with a small convexity at middle and two at side, horn at middle of frons well developed with a small convexity at side of eye, frons overall coarsely punctuate, rugose; clypeofrontal suture vestigial; anterior side of pronotum behind head upright, face concave, coarse punctures concentrated on anterior and lateral sides of pronotum, midline deeply indented, coarsely punctate; scutellum sparsely punctate; each elytron with 7 coarsely punctate striae between suture and humeral umbone, stria 2 interrupted by stria 1 not reaching base, stria 5 terminated in length subequal to stria 2; intervals 1, 3 and 4 more convex and wider than others, interval 2 less convex than others; parameres moderately swollen, a tuft of long setae at dorsal base of parameres, half in length of basal piece; apex of median lobe bilobate with a hook-like sclerite, lateral sclerite well developed.

Distribution.

Negros Island, central Philippines (Fig. 39).

Remarks.

We have examined the species based on a single female which was collected at the type locality, and this specimen agrees with the original description of the species. Bolbochromus hirokawai has distinct features such as body color pattern and structures of the head and pronotum that make it easily distinguishable from others within the genus.