Figs 1–2
Type material. Holotype: Male ( IZCAS Ar39745), Xiaolongha Village, ( 21°24’19.8”N, 101°37’01.3”E, elevation 801 ± 22m), Mengla County, Xishuangbanna, Yunnan, China, 30 June 2012, Q. Zhao and Z. Chen leg. Paratype: 1 female ( IZCAS Ar39746), same data as holotype.
Etymology. The specific name refers to the type locality and is a noun in apposition.
Diagnosis. This species resembles B. yangxiaodongi Yao & Li, 2018 (see Yao et al. 2018: 255, figs 9– 10, 11E, 12E) with similar male chelicerae ( Fig. 2D), bulbal apophyses ( Fig. 2C) and vulva ( Fig. 2B) but can be distinguished by presence of dorsal apophysis proximally on pedipalpal femur (arrow in Fig. 1A), absence of spine distally and membranous flap retrolaterally on procursus ( Figs 1 A–D), presence of angular distal sclerite retrolaterally (arrow 1 in Fig. 1D) and large, flat, distal membranous lamella (arrow 2 in Fig. 1D) on procursus, and by presence of subcuticular teeth on epigynum ( Fig. 2A).
Description. Male ( holotype): Total length 1.50 (1.61 with clypeus), carapace 0.73 long, 0.63 wide, opisthosoma 0.77 long, 0.56 wide. Leg I: 11.32 (3.80 + 0.40 + 2.64 + 3.36 + 1.12), leg II: — (2.19 + 0.31 + 2.00 + 2.91 + –), leg III missing, leg IV: — (2.10 + 0.50 + 1.75 + 2.35 + –); tibia I L/d: 42. Habitus as in Figs 2 E–F. Carapace and sternum pale, without marks. Legs pale, without darker rings. Opisthosoma pale, without spots. Distance PME- PME 0.13, diameter PME 0.08, distance PME-ALE 0.03, AME absent. Ocular area not elevated. Thoracic furrow absent. Clypeus unmodified. Sternum approximately as wide as long (0.64). Chelicerae ( Fig. 2D) with pair of small proximo-lateral apophyses and pair of long, curved distal apophyses each provided with modified seta on its tip (distance between tips: 0.42). Pedipalps as in Figs 1 A–B; coxa unmodified; trochanter with very short retrolateroventral apophysis (arrow in Fig. 1B); femur with small dorsal apophysis proximally (arrow in Fig. 1A); procursus ( Figs 1 A–D) simple proximally but complex distally, with angular distal sclerite retrolaterally (arrow 1 in Fig. 1D) and large, flat, distal membranous lamella (arrow 2 in Fig. 1D); bulb ( Fig. 2C) with hooked apophysis and wide embolus. Retrolateral trichobothria of tibia I at 13% proximally; legs with short vertical setae on metatarsi, without spines and curved setae; tarsus I with 17 distinct pseudosegments.
Female (IZCAS Ar39746): Similar to male, habitus as in Figs 2 G–H. Total length 1.40 (1.52 with clypeus), carapace 0.68 long, 0.56 wide, opisthosoma 0.72 long, 0.68 wide; tibia I: 1.42; tibia I L/d: 37. Distance PME-PME 0.14, diameter PME 0.08, distance PME-ALE 0.03, AME absent. Sternum approximately as wide as long (0.58). Epigynum ( Fig. 2A) simple and flat, with pair of pockets 0.47 apart (ep in Figs 2 A–B) and several subcuticular teeth. Vulva ( Fig. 2B) with ridge-shaped anterior arch and pair of narrow, curved pore plates far apart.
Distribution. China ( Yunnan, type locality; Fig. 7).