Sinoderces nawanensis Li & Li, sp. nov. (Figs 9–10, 15)

Material examined. Holotype male, China, Guangxi Zhuang Autonomous Region, Nanning City, Longan County, Nanxu Town, Nawan Village, cave without name (23º12.528’N, 107º35.020’E; elev. 113 m), 13 May 2015, leg. F. Li & Z. Chen. Paratypes. 1 male, 2 females, same data as holotype (IZCAS) .

Etymology. The species name is an adjective refering to the type locality.

Diagnosis. The male of this species is easily recognized by the sickle-shaped embolus (Figs 9 A–D). Females of the two species of Sinoderces Li & Li, sp. nov. are very similar but can be distinguished as follows. The female of this species is diagnosed by the elongate, curved spermathecae which narrow distally (Fig. 10A) (versus spermathecae of same width throughout their length in S. exilis).

Description. Male (holotype). Total length 2.02; carapace 0.70 long, 0.75 wide; abdomen 1.13 long, 0.63 wide. Carapace round, yellow with some brown bands of differing width (Fig. 10C). Fovea shallow. Chelicerae yellow. Cheliceral promargin with distinct lamina and no teeth, retromargin with one small tooth, posterior surface of fang with 12 small denticles. Clypeus slanting, brown. Labium slanting, brown, triangular. Sternum brown. Abdomen elongate with complex patterns dorsally and ventrally. Legs brown, measurements: I missing, II missing, III 5.09 (1.48, 0.23, 1.52, 1.17, 0.69), IV 7.46 (2.10, 0.26, 2.30, 1.80, 1.00). Palp (Figs 9 A–D): tibia swollen, cymbium with numerous long macrosetae distally; bulb yellow, oval; conductor small, lamina-like; embolus slender, sickle-shaped; conductor and embolus separated basally, arising from bulb distally.

Female. Similar to male in coloration and general features, but slightly larger (Figs 10 D–E). Measurements: total length 2.23; carapace 0.65 long, 0.55 wide; abdomen 1.58 long, 1.11 wide. Leg measurements: I 6.31 (1.75, 0.28, 1.88, 1.50, 0.90), II missing, III 4.04 (1.10, 0.23, 1.22, 0.94, 0.55), IV 5.65 (1.41, 0.25, 1.80, 1.33, 0.86). Vulva with two pairs of transparent, distinctly curved, duct-like spermathecae, narrowing distally (Fig. 10A).

Distribution. Known only from the type locality (Fig. 15).