Holotype, male (Fig. 48a). Length 3.31 mm. Color of legs and head ferruginous, elytra deep ferruginous with indistinct transverse black band near middle and black mark near apex; remainder black. Body elongate; in dorsal aspect with marked constriction between pronotum and elytron; in profile dorsally flat, apically convex. Rostrum with median and pair of submedian ridges; intervening furrows with each with partly abraded row of erect piliform scales; epistome simple. Pronotum with indistinct subapical constriction; disk densely punctate. Elytra with striae indistinct; intervals flat; with small, confused punctures; especially basally with scattered elongate, recumbent, cream-colored scales; interspaces microreticulate; interval 7 in apical third forming sharp lateral edge; apex subtruncate, sutural interval not protruding. Anteroventral ridge of femora crenulate, forming blunt tooth. Metafemur subapically with stridulatory patch. Dorsal edge of tibiae subbasally with angulation extended as acute tooth in pro- and mesotibia. Abdominal ventrite 5 with shallow concave pit laterally bordered by ridges. Penis (Fig. 48b) with sides of body subparallel; apex bidentate, with median notch; transfer apparatus spiniform, ca. as long as body; apodemes 2.3 × as long as body; ductus ejaculatorius without bulbus. Intraspecific variation. Length 2.88–3.31 mm. Color of elytra with black marking more or less extensive, sometimes with apical half almost completely black. Female rostrum with median and pair of submedian glabrous costae. Female abdominal ventrite 5 flat.

Holotype (MZB): ARC2332 (EMBL # LM655785), East Java Prov., Banyuwangi Reg., Meru Betiri N.P., Sukamade, sample 2, S08°32.221', E113°51.985', 260 m, 12/13-IV-2011. Paratypes (MZB, SMNK, ZSM): E-Java Prov., Banyuwangi Reg., Meru Betiri N.P., Sukamade: 5 exx, ARC2333 (EMBL # LM655786), same data as holotype; 2 exx, ARC2334 (EMBL # LM655787), ARC2335 (EMBL # LM655788), sample 4, S08°32.163', E113°51.904', 340 m, 13-IV-2011.

E-Java Prov. (Meru Betiri N.P.). Elevation: 260–340 m.

This epithet is based on the type locality, Meru Betiri National Park.

Trigonopterus merubetirensis Riedel, sp. n. was coded as “Trigonopterus sp. 346”.