Holotype, male (Fig. 82a). Length 1.90 mm. Color ferruginous, pronotum almost black. Body in dorsal aspect subovate, with weak constriction between pronotum and elytron; in profile dorsally convex. Rostrum with median and pair of indistinct submedian ridges; chagreened, with sparse rows of subrecumbent scales; in front of forehead median ridge terminating, projecting from profile; epistome with subangulate ridge. Pronotum with disk densely punctate; interspaces subglabrous, microreticulate; each puncture containing small recumbent seta. Elytra with striae indistinct; punctuation almost confused, punctures small; intervals flat, microreticulate; elytral apex subtruncate. Anteroventral ridge of femora terminating in apical third. Metafemur subapically with stridulatory patch. Dorsal edge of tibiae with subbasal angulation, dentate in pro- and mesotibia. Abdominal ventrites 1–2 at middle concave, subglabrous, anteriorly with few long erect narrow scales, laterally with swollen rim; abdominal ventrite 2 posteriorly with transverse ridge, in profile projecting dentiform; abdominal ventrite 5 basally with transverse costa, at middle weakly concave, subglabrous, laterally punctate and with sparse suberect scales. Penis (Fig. 82b) with sides of body subparallel, near middle widened; apex subtruncate, sparsely setose; transfer apparatus complex, small; apodemes 1.3 × as long as body; ductus ejaculatorius without distinct bulbus. Intraspecific variation. Length 1.90–2.32 mm. Female rostrum dorsally subglabrous, with submedian rows of coarse punctures; epistome simple. Elytral punctuation almost confused or with distinct striae.

Holotype (MZB): ARC2547 (EMBL # LM655884), W-Kalimantan Prov., Singkawang, Mt. Poteng, sample 3, N00°51.211', E109°03.418', 651 m, 13-XII-2011. Paratypes (SMNK): 1 ex, ARC2548 (EMBL # LM655885), same data as holotype.

W-Kalimantan Prov. (Singkawang). Elevation: 651 m.

This epithet is based on the type locality.

Trigonopterus singkawangensis Riedel, sp. n. was coded as “Trigonopterus sp. 367”.