35. Chaetocnema (Chaetocnema) sabahensis Ruan, Konstantinov & Yang, New Species (Fig. 56) Etymology: This species is named after the type locality. Specific epithet is a noun in apposition. Distribution: Malaysia, Singapore. Host plants: Unknown. Diagnosis: This species resembles C. hainanensis by the following characters: a distinct ridge present on each side of aedeagus on ventral side, in lateral view, aedeagus is strongly curved near apex and base, while straight at middle. However, they can be distinguished by the difference in shape of the body and aedeagus. This species also resembles C. luisiadae from Bagaman Islands in the Louisiade Archipelago [Papua New Guinea], however, it differs from the latter by narrower frontal ridge and sinuated base of pronotum. The female of Chaetocnema sabahensis is rather unique among the Oriental species of the genus in having a trilobed (usually simple in other species) last abdominal ventrite (Fig. 56 J). Description: Body length (excluding head): 1.85–2.10 mm, body width 1.10–1.20 mm. Ratio of elytron length (along suture) to width (maximum): 2.40–2.50. Ratio of pronotum width (at base) to length: 1.60–1.70. Ratio of length of elytron to length of pronotum (along middle): 2.30–2.40. Ratio of width of elytra at base to width of pronotum at base (in middle of humeral calli): 1.00–1.05. Ratio of maximum width of elytra to maximum width of pronotum: 1.20–1.30. Dorum coppery to bronzy. Antennomeres 1–6 completely yellow, 7–11 dark yellow to light brown. Tibiae and tarsi yellow. Pro- and mesofemora dark yellow. Metafemora dark brown. Head hypognathous. Frontal ridge narrow and convex. Ratio of width of frontal ridge to width of antennal socket: 1.10–1.20. Frontolateral sulcus present. Suprafrontal sulcus not deep, obcordate. Orbital sulcus deep. Number of punctures on vertex: 4–6 on each side near eye. Vertex evenly and minutely granulose. Number of punctures on orbit: 2–3 on each side. Punctures on orbit close to each other, forming a short longitudinal row. Number of ...