Ischnothyreus xiaolongha Tong & Li sp. nov. Figures 17, 18, 19, 21A-E, 24C, D

Type material.

Holotype ♂: China, Yunnan, Mengla County, Xiaolongha, Xishuangbanna Biodiversity Conservation Corridor, Qidaoban, valley forest; 21°24.832'N, 101°37.906'E; 721 m; 18.VI.2013; Q. Zhao and Z. Chen leg. (SYNU-428). Paratypes 1♀: same data as for holotype (SYNU-429); 1♂3♀: same data as for holotype; 21°24.253'N, 101°36.324'E; 761 m; 15.VI.2013; Q. Zhao and Z. Chen leg. (SYNU-430-433).

Diagnosis.

The new species is similar to I. cristiformis sp. nov. and I. mangun sp. nov. in the lamella-like membrane of the male palp and the short dorsal scutum of the abdomen, but can be distinguished by the tongue-shaped sclerotized process (Fig. 17H-J) of the cheliceral fang (vs large cockscomb-shaped sclerotized process (Fig. 1H-J) in I. cristiformis sp. nov. and the unmodified male cheliceral fang (Fig. 4H, I) in I. mangun sp. nov.), the broad leaf-shaped retrolateral lobe of the male palp (Fig. 18F) (vs broad rectangular-shaped (Fig. 2F) in I. cristiformis sp. nov. and narrow leaf-shaped (Fig. 5F) in I. mangun sp. nov.) and the small bell-shaped atrium (Fig. 19H) of the female (vs the large bowl-shaped atrium (Fig. 3H) in I. cristiformis sp. nov. and the small rectangular shaped atrium (Fig. 6F) in I. mangun sp. nov.).

Description.

Male (holotype). Body: habitus as in Fig. 17A-C; body length 1.48. Carapace: 0.80 long, 0.61 wide; yellow, with egg-shaped patches behind eyes, surface of elevated portion of pars cephalica smooth, sides finely reticulate, fovea absent, lateral margin straight, smooth (Fig. 17D, E). Clypeus: height about equal to ALE diameter (Fig. 17G). Eyes: see Fig. 17D, G. Sternum: pale orange (Fig. 17F). Mouthparts: chelicerae, endites and labium orange; chelicerae straight, base of fangs with tongue-shaped sclerotized process, fang groove with a few small denticles (Figs 17H-J, 21D, E); anteromedian tip of endites with one strong, tooth-like projection (Fig. 17F). Abdomen: 0.64 long, 0.48 wide; dorsal scutum pale orange, very small, covering approximately 1/4 of the abdomen width and 1/3 of the abdomen length, not fused to epigastric scutum; epigastric and postgastric scutum well sclerotized, pale orange, fused, postgastric scutum covering about 1/2 of the abdomen length (Fig. 17A-C). Legs: pale orange, femur I with 2 prolateral spines, tibia I with 4 pairs, metatarsus I with 2 pairs of long ventral spines. Leg II spination similar to leg I except femur with only 1 prolateral spine. Legs III and IV spineless. Palp: trochanter with ventral projection, cymbium brown; bulb with 2 ventral protuberances, one large and another very small, distal end of bulb stout, with one narrow needle-shaped prolateral projection and a lamella-like membrane, retrolateral lobe broad leaf-shaped (Figs 18, 21A-C).

Female (paratype, SYNU-429). Same as male except as noted. Body: habitus as in Fig. 19A-C; body length 1.70. Carapace: 0.76 long, 0.63 wide. Mouthparts: chelicerae and endites unmodified. Abdomen: 0.95 long, 0.64 wide. Epigastric area: surface without external features (Fig. 19H). Endogyne: from the middle of the slightly thickened margin of the postgastric scutum runs a dark, simple winding tube posteriorly, ending in a small bell-shaped atrium (Fig. 24C, D).

Etymology.

The specific name is a noun in apposition taken from the type locality.

Distribution.

Known only from the type locality.