Holotype, male (Fig. 66a). Length 1.75 mm. Color of antennae and tarsi ferruginous, remainder black. Body in dorsal aspect with marked constriction between pronotum and elytron; with distinct constriction in profile. Rostrum with median ridge and pair of submedian ridges, intervening furrows with sparse rows of setae; epistome with transverse, subangulate ridge. Pronotum with subapical constriction; disk coarsely punctate-rugose, sparsely setose; in basal half with pair of sublateral, kidney-shaped impressions; with median ridge. Elytra with striae deeply impressed, each with row of short, suberect setae; intervals costate-carinate, subglabrous; apex subtruncate, weakly rounded. Femora each with small tooth; profemur relatively long. Metafemur subapically with stridulatory patch. Abdominal ventrite 5 flat, coarsely punctate. Penis (Fig. 66b) with sides of body subparallel, in apical third converging; apex subangulate, medially with sparse setae; transfer apparatus flagelliform, relatively thick, 2.6 × as long as body; apodemes 2.5 × as long as body. Intraspecific variation. Length 1.71–1.86 mm. Coloration dark as in holotype, or largely deep ferruginous. Female rostrum dorsally subglabrous, sparsely punctate, with dorsolateral pair of furrows.

Holotype (MZB): ARC2219 (EMBL # LM655675), East Nusa Tenggara Prov., Flores, Labuhan Bajo, Roe, sample 1, S08°36.540', E120°01.871', 955 m, 13-III-2011. Paratypes (MZB, SMNK): Flores: 1 ex, ARC2218 (EMBL # LM655674), same data as holotype; 2 exx, ARC2227 (EMBL # LM655683), ARC2228 (EMBL # LM655684), Labuhan Bajo, Roe, sample 5, S08°35.395', E120°00.383', 790 m, 13-III-2011; 2 exx, ARC2245 (EMBL # LM655700), ARC2246 (EMBL # LM655701), Labuhan Bajo, Tebedo, lowland forest, sample 1, S08°29.848', E119°59.633', 525 m, 14-III-2011.

East Nusa Tenggara Prov., Flores (Labuhan Bajo). Elevation: 525–955 m.

This epithet is based on the type locality.

Trigonopterus roensis Riedel, sp. n. was coded as “Trigonopterus sp. 353” by Tänzler et al. (2014).