Belisana xiangensis sp. nov.

Figs 22–24, 41

Type material. Holotype: Male (IZCAS), Tham Xiang [18°54.550′N, 102°26.527′E, alt. 270 m], 1.54 km south of Vieng keo Village, Vang Vieng District, Vien Tiane, Laos, 3 December 2012, leg. Z. Yao (Yao-LA 086). Paratypes: 1 male and 2 females (IZCAS), same data as holotype.

Etymology. The specific name refers to the type locality; adjective.

Diagnosis. The species resembles B. leuser (Huber 2005a: 62, figs 376–394), but can be distinguished by different shape of distal apophyses of male chelicerae (Figs 23 D and 24C), small membranous flap (Figs 22 B and 24B) and different position of pockets (Figs 23 A and 24D).

Description. Male (holotype): Total length 1.47 (1.56 with clypeus), prosoma 0.56 long, 0.63 wide, opisthosoma 0.91 long, 0.75 wide. Legs I, II and IV lost, leg III: 6.76 (1.95 + 0.25 + 1.60 + 2.41 + 0.55). Habitus as in Fig. 23 E. Dorsal shield of prosoma and sternum whitish, without marks; ocular area with indistinct dark marks. Leg III yellowish, without darker rings. Opisthosoma yellowish, without spots. Distance PME-PME 0.11, diameter PME 0.07, distance PME-ALE 0.01, AME absent. Ocular area not elevated. Thoracic furrow absent. Sternum wider than long (0.50/0.44). Chelicerae as in Figs 23 D and 24C, with a pair of thumb-shaped apophyses proximally and a pair of long, curved apophyses distally (distance between tips: 0.28). Pedipalpi as in Figs 22 A–B and 24A–B; trochanter with a short retrolatero-ventral apophysis; femur with a dorsal apophysis; procursus simple proximally but complex distally, with a membranous flap retrolaterally and a bent spine; bulb with a hooked apophysis and a simple embolus.

Variation: Total length in another male: 1.47 (1.57 with clypeus); leg I lost.

Female: Similar to male, habitus as in Figs 23 F–G. One of the specimens measured: Total length 1.69 (1.78 with clypeus), prosoma 0.59 long, 0.63 wide, opisthosoma 1.10 long, 0.73 wide; tibia I: 3.27 (leg I lost in another specimen). Distance PME-PME 0.12, diameter PME 0.08, distance PME-ALE 0.01, AME absent. Epigynum (Figs 23 A and 24D) simple and flat externally, with dark internal shade and a pair of pockets 0.29 apart. Vulva (Figs 23 B and 24E) with a wavy arch anteriorly and a pair of long, narrow pore plates. Retrolateral trichobothrium of tibia I at 18%; most hairs lost on legs.

Distribution. Known only from the type locality (Fig. 41).