Bolbochromus (Bolbochromus) mindanaicus Krikken & Li, 2013

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) mindanaicus Krikken & Li, 2013 Figs 9, 10, 17, 23

Further material examined.

PHILIPPINES: Mindanao, Sultan Kudarat Province, Culumbio, Dataksaub, Tampakan, Datal-Biaw, VIII.2015, H Cahilo (1 female at CCLI);

Diagnosis.

A small Bolbochromus species that can be separated from other congeners by the following combination of characters: body length 6.0-7.0 mm; dorsum black, pronotum with yellowish brown markings along lateral sides as well as midline or sometimes becoming entirely yellowish brown as in the individual shown in Figs 9, 10, 17; each elytron with three markings, two along suture and one close to umbone, size of markings varied; eyes small, canthus wide and simple; anterior margin of clypeus beaded with a small convexity at middle and two at side, frons with a small convexity at middle of base, tip bilobed, frons overall coarsely punctate (Fig. 23); clypeofrontal suture visible; coarse punctures concentrated on disc of both sides of pronotal midline, punctate midline distinctly indented, punctures coarse; anterior side of pronotum behind head smoothly declivous, coarse punctures concentrated on anterior face and sides of pronotum; scutellum sparsely punctate, punctures small; 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 elongate, tips rounded, equal in length of basal pieces; median lobe distinctly sclerotized, without protruding sclerite.

Distribution.

Mindanao island, southern Philippines (Fig. 39).

Remarks.

The pronotal marking pattern of this species greatly varied where the black portion might be entirely replaced by a yellowish-brown color. On the other hand, elytral markings are variable in size. Bolbochromus mindanaicus is widely distributed throughout Mindanao and neighboring islands (e.g. Jolo island roughly 110 km southwest of Mindanao).