Ischnothyreus mengyang Tong & Li sp. nov. Figures 7, 8, 9, 20G-I, 22E, F, 23E, F

Type material.

Holotype ♂: China, Yunnan, Jinghong City, Mengyang Town, Xishuangbanna Natural Reserve, monsoon forest; 21°24.161'N, 101°36.412'E; 791 m; 16.VI.2013; Q. Zhao and Z. Chen leg. (SYNU-387). Paratypes 5♂12♀: same data as for holotype (SYNU-388-404).

Diagnosis.

The new species is similar to I. taunggyi Tong & Li, 2020 in the male palp and the large, sclerotized process of male cheliceral fang, but can be distinguished by the broad retrolateral lobe of male palp (Fig. 8F) (vs small, ear-shaped retrolateral lobe in I. taunggyi; Tong et al. 2020: fig. 9F) and by the long abdominal dorsal scutum of the female (5/6 of the abdomen length (Fig. 9A) vs less than 1/2 of the abdomen length in I. taunggyi; Tong et al. 2020: fig. 10A).

Description.

Male (holotype). Body: habitus as in Fig. 7A-C; body length 1.86. Carapace: 0.95 long, 0.78 wide; pale brown, with egg-shaped patches behind eyes, surface of elevated portion of pars cephalica smooth, sides finely reticulate, lateral margin straight, smooth (Fig. 7D, E). Clypeus: height about 0.74 times ALE diameter (Fig. 7G). Eyes: see Fig. 7D, G. Sternum: pale orange (Fig. 7F). Mouthparts: chelicerae, endites and labium brown; chelicerae straight, base of fangs with large, sclerotized process, fang groove with a few small denticles (Figs 7H-J, 22E, F); anteromedian tip of endites with one strong, tooth-like projection (Fig. 7F). Abdomen: 0.92 long, 0.55 wide; dorsal scutum well sclerotized, pale orange, covering approximately 4/5 of the abdomen length and 3/4 of the abdomen width, not fused to epigastric scutum; epigastric and postgastric scutum well sclerotized, pale orange, fused, postgastric scutum covering about 3/4 of the abdomen length (Fig. 7A-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 elongated, with one narrow leaf-shaped prolateral projection and a distal hook-shaped membrane, retrolateral lobe broad (Figs 8, 20G-I).

Female (paratype, SYNU-393). Same as male except as noted. Body: habitus as in Fig. 9A-C; body length 1.96. Carapace: 0.94 long, 0.82 wide. Mouthparts: chelicerae and endites unmodified. Abdomen: 1.05 long, 0.73 wide; dorsal scutum covering 5/6 of the abdomen length, about 2/3 of the abdomen width. Epigastric area: postgastric scutum with central anchor-shaped structure (Fig. 9H). Endogyne: from the middle of the slightly thickened margin of the postgastric scutum runs a dark, complex winding tube, ending in a very small nipple-shaped atrium (Fig. 23E, F).

Etymology.

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

Distribution.

Known only from the type locality.