Figs 5–6
Type material. Holotype: Male ( IZCAS Ar39748), seasonal rain forest ( 22°09’45.9”N, 100°52’33.2”E, elevation 862 ± 33 m), Mengyang County, Xishuangbanna, Yunnan, China, 22 July 2012, Q. Zhao and Z. Chen leg. Paratypes: 5 males ( IZCAS Ar39749–Ar39753) and 2 females ( IZCAS Ar39754–Ar39755), same data as holotype.
Etymology. The specific name refers to the type locality and is a noun in apposition.
Diagnosis. This species resembles B. cas Yao & Li, 2018 (see Yao et al. 2018: 250, figs 7–8, 11D, 12D) with similar male chelicerae ( Fig. 6C) and bulbal apophyses ( Fig. 6D) but can be distinguished by presence of curved prolateral sclerite distally (arrow 1 in Fig. 5C) and large retrolateral membranous process distally (arrow 2 in Fig. 5C) on procursus, dorsally strongly protruding procursus (arrow in Fig. 5A), unmodified male pedipalpal coxa ( Fig. 5B). The female is recognised by presence of subcuticular teeth on epigynum ( Fig. 6A), slightly separated vulval pore plates ( Fig. 6B) and by absence of serrated sclerites on vulva ( Fig. 6B).
Description. Male ( holotype). Total length 1.39 (1.48 with clypeus), carapace 0.53 long, 0.52 wide, opisthosoma 0.86 long, 0.55 wide. Leg I: 10.06 (3.60 + 0.31 + 1.40 + 2.25 + 2.50), leg II: 7.64 (2.50 + 0.31 + 2.19 + 1.88 + 0.76), leg III: 6.20 (1.60 + 0.31 + 1.25 + 2.50 + 0.54), leg IV: 8.60 (2.50 + 0.25 + 2.00 + 3.20 + 0.65); tibia I L/d: 39. Habitus as in Figs 6 E–F. Carapace and sternum pale, without marks. Legs pale, without darker rings. Opisthosoma pale, without spots. Distance PME-PME 0.08, diameter PME 0.05, distance PME-ALE 0.03, AME absent. Ocular area not elevated. Thoracic furrow absent. Clypeus unmodified. Sternum approximately as wide as long (0.44). Chelicerae ( Fig. 6C) with pair of small proximo-lateral apophyses and pair of short distal apophyses (distance between tips: 0.14). Pedipalps as in Figs 5 A–B; coxa unmodified; trochanter with short retrolatero-ventral apophysis (arrow in Fig. 5B); femur without dorsal apophysis proximally; procursus ( Figs 5 A–D) simple proximally and complex distally, strongly protruding subdistally (arrow in Fig. 5A), with curved prolateral sclerite distally (arrow 1 in Fig. 5C) and large retrolateral membranous process distally (arrow 2 in Fig. 5C); bulb ( Fig. 6D) with hooked apophysis and simple embolus. Retrolateral trichobothria of tibia I at 23% proximally; legs with short vertical setae on metatarsi, without spines and curved setae; tarsus I with 12 distinct pseudosegments.
Female (IZCAS Ar39754): Similar to male, habitus as in Figs 6 G–H. Total length 1.55 (1.65 with clypeus), carapace 0.67 long, 0.63 wide, opisthosoma 0.88 long, 0.65 wide; tibia I: 1.37; tibia I L/d: 35. Distance PME-PME 0.09, diameter PME 0.05, distance PME-ALE 0.03, AME absent. Sternum approximately as wide as long (0.56). Epigynum ( Fig. 6A) simple and flat, with pair of pockets 0.12 apart (ep in Figs 6 A–B) and several subcuticular teeth. Vulva ( Fig. 6B) with curved anterior arch and pair of strongly curved pore plates.
Variation: Tibia I in four male paratypes (IZCAS Ar39749–Ar39752; leg I missing in IZCAS Ar39753): 1.33, 1.35, 1.37, 1.43. Tibia I in another female paratype (IZCAS Ar39755): 1.40.
Distribution. China ( Yunnan, type locality; Fig. 7).