Insula nigricula sp. nov.

Figs 180–192, 258

Type material: Holotype: male, Mt. Limushan (19°10.874′N, 109°45.322′E, alt. 637 m), Qiongzhong County, Hainan Island, China, 3 May 2011, leg. Yuanye Zhou. Paratypes: 1 male, 6 females (IZCAS), same data as holotype.

Etymology. The specific name is from Latin nigriculus (dim), in reference to the colour of the species; adjective.

Diagnosis. Male can be distinguished from other species as follow: from I. hebetata sp. nov., I. longa sp. nov., I. minuta sp. nov., I. ramosa sp. nov., I. scutata sp. nov., I. tumida sp. nov. and I. uncinata sp. nov. in having a relatively short patellar apophysis, which is just reaching the bottom of bulbus (Figs 180, 186; 122, 128; 148, 154; 167, 173; 193, 199; 206, 212; 232, 238; 245, 251); from I. limuensis sp. nov. in having a thinner compound teminal apophysis (Figs 185, 186; 140, 141); from I. maculata (Peng & Kim, 1997) and I. squamata sp. nov. in having a notch between the rough and smooth portion of compound teminal apophysis (Figs 180, 186; 161, 165; 219, 225). Female resembles I. maculata (Peng & Kim, 1997), I. minuta sp. nov., I. tumida sp. nov. and I. uncinata sp. nov., can be distinguished by the position of spermatheca and the shape of sclerite to which the spermathecae connect (Figs 183, 189; 169, 176; 235, 241; 248, 254).

Description. Male (Figs 180, 181, 184–187, 190): Total length 1.6, PL 0.8, PW 0.7, OL 0.7, OW 0.6. Eye sizes: AME 0.2, ALE 0.15, PME 0.05, PLE 0.15, AER 0.7, PER 0.65, EFL 0.55. Legs: I 1.45 (0.45, 0.25, 0.3, 0.25, 0.2), II 1.3 (0.4, 0.2, 0.25, 0.25, 0.2), III 1.2 (0.4, 0.15, 0.25, 0.25, 0.15), IV 1.75 (0.55, 0.25, 0.45, 0.3, 0.2); formula: 4123.

Dorsal prosoma dark brown, with dark sides, clothed brown and white setae. Clypeus height 0.05, Clypeus brown, covered with light brown setae. Fovea, cervicle and radial grooves unclear. Chelicerae small and brown, with one promarginal teeth, retromargin with two teeth. Endites, labium and sternum light brwon. Leg I with black longitudinal stripes. Metatarsus I with three pairs of ventral spines. Optisthosoma cylindrical, dark brown, with two pairs of yellow spots, following one yellow latitudinal stripe; anterior margin covered with long white setae; ventral opisthosoma yellow. Spinnerets brown, anterior spinnerets shorter and stronger than posterior ones. Palp (Figs 180, 181, 184–187): Patellar apophysis extending to the bottom of bulbus, with irregular apophyses distally. Compound teminal apophysis as wide as embolus, partially membranaceous, with a notch at tip of bulbus, rough and pointed distally. Embolus long and curved distally. Seminal duct moderately wide and twisted.

Female (Figs 182, 183, 188, 189, 191, 192): Total length 1.8, PL 0.9, PW 0.7, OL 1.0, OW 0.8. Eye sizes: AME 0.25, ALE 0.15, PME 0.025, PLE 0.16, AER 0.75, PER 0.7, EFL 0.6. Legs: I 1.6 (0.5, 0.3, 0.35, 0.25, 0.2), II 1.4 (0.4, 0.25, 0.3, 0.25, 0.2), III 1.35 (0.4, 0.2, 0.25, 0.3, 0.2), IV 2.0 (0.6, 0.25, 0.5, 0.4, 0.25); formula: 4123.

Optisthosoma oval, yellowish brown, with three garyish black latitudinal stripes. Other characters similar to those of male. Epigyne (Figs 182, 188): moderately sclerotized, longitudinal axis heavily sclerotized. Vulva (Figs 183, 189): Copulatory ducts membranaceous and coiled, merged at middle of the vulva. Glandular ducts thin, along with the copulatory ducts. Spermathecae oval, with short duct connect to fertilization duct.

Distribution. The species is known only from the type locality (Fig. 258).