Myrmarachne sabahna sp. nov. (Figs 37 A–G, 38 A–F) Type material. Holotype male (UMS), Guramboi, Sabah, BORNEO, 15 III 2008, T. Yamasaki leg. Paratypes: BORNEO: 1 female (UMS), Danum Valley, Sabah, 20 II 2005, T. Endo leg.; 1 male (UMS), same loc., 20 II 2005, Inoue leg.; 1 female (UMS), same loc., 16 XII 2006, R. Oie leg.; 1 male (UMS), Mahua, Sabah, 4 X 2009, T. Yamasaki leg.; 2 males and 1 female (UMS), Bukit tupai, Kinabalu Park, Sabah, 3 III 2008, T. Yamasaki leg; 2 males (BMNH), Gunung Alab substation, Crocker Range Park, Sabah, 17–19 III 2008, T. Yamasaki leg.; 1 male (MSNG), same loc., 4 X 2010, T. Yamasaki leg. Diagnosis. Dark brown to black species. In males, chelicera in dorsal view tapering toward apex, with distinct incision on its outer margin basally (Fig. 37 A); fang almost straight except for curved tip, and without tooth-like apophysis. In females, margins of copulatory atria indistinct (Figs 38 D–F); sclerotised copulatory ducts twisted, narrow posteriorly; elongated median pocket located between sclerotised copulatory ducts. Measurements (male/female). Carapace length 1.85–2.40 (2.35)/ 2.25–2.43, width 1.14 –(1.52)/ 1.20–1.30. Abdomen length 1.88 –(2.35)/ 2.50–2.77. Chelicera length 1.30 –(2.35). Sternum length 1.05–1.38 (1.30)/ 1.13–1.27. Width of eye row I 1.05 –(1.34)/ 1.18–1.27; II 0.92 –(1.18)/ 1.08–1.15; III 1.16 –(1.46)/ 1.30–1.42. ALE–PLE 0.83 – (1.08)/ 0.98 –1.00; ALE–PME 0.42 –(0.54)/ 0.46–0.50. Eye size: AME 0.32 –(0.40)/ 0.34–0.42, ALE 0.18 –(0.22)/ 0.20–0.22, PME 0.04 –(0.06)/ 0.06–0.07, PLE 0.19 –(0.25)/ 0.20–0.24. Male (Figs 37 A–G). Cephalic part almost flat or weakly convex dorsally. Thoracic part in lateral view lower than upper margin of PLE; anterior dorsum of thoracic part almost flat, and posterior dorsum abruptly sloping downward. Chelicera in dorsal view tapering toward apex with distinct incision on outer margin basally, and with six or seven prolateral and seven retrolateral teeth. Fang almost straight except for curved tip, and without toothlike apophysis. Sternum ...