Mesochorus (Stictopisthus) sabahensis nov. sp. (Figs 5E, 11H, 14E, 19B, 23K) Holotype. (♀) Malaysia: SE Sabah, nr Danum Valley Field C, c. 150 m, WONO, Mal. trap 5, 26.x. –22.xi.1987, C. v. Achterberg, RMNH´87 (Leiden). Paratypes: (♀) with similar label (Leiden); (#f) Malaysia: SE Sabah, nr Danum Valley Field C, c 150 m, WONO, Mal. trap 5, 26.v. –20.vi.1987, C. v. Achterberg & D. Kennedy, RMNH´87 (coll. Riedel). Etymology. The species name is derived from Sabah. Description. ♀: Body length 3.5–3.6 mm. Fore wing 2.8–3.0 mm. Head. Flagellum with 28–30 flagellomeres; 1 st flagellomere 5.5–5.6 × longer than wide and 1.7 × longer than 2 nd flagellomere, 0.6 × as long as eye; 2 nd flagellomere 3.4–3.6 × longer than wide; preapical flagellomere 2.0 × longer than wide. Occipital carina complete medially. Temple moderately and roundly narrowed behind eye, dorsally c 0.5 × as long as eye. OED 1.7–2.0 × and OOD 0.6–0.8 × ocellar diameter. Frons smooth, with microsculpture laterally and with fine median longitudinal ridge. Face (Fig. 11H) coarsely but partly sparsely punctate, width 1.0 × combined length of face and clypeus and 1.1 × eye length; inner eye margins slightly convergent ventrally. Subantennal transverse carina not dipped medially. Malar space, mandible and ventral 0.3 of facial orbit with fine striae. Malar space 0.9 × as long as width of mandibular base. Mandible with two equal teeth. Genal carina reaching hypostomal carina away from mandibular base, both carinae low. Mesosoma. 1.7 × longer than high. Side of pronotum large smooth, with few very sparse punctures. Notaulus distinct in frontal 0.3 of mesoscutum. Mesoscutum (Fig. 14E) with rather dense punctures, shining. Mesopleuron densely and coarsely punctate, speculum smooth. Dorsal end of epicnemial carina reaching frontal margin of mesopleuron. Scuto-scutellar groove (Fig. 14E) rather large, c 2.5 × wider than long, with 8-10 fine longitudinal ridges. Scutellum rounded in profile, with fine sparse punctures. Propodeum (Fig. 19B) completely carinate ...