Tmarus undatus sp. nov.

Figs 13 E–F, 15A–C

Type material: (all from CHINA, Yunnan: Xishuangbanna, Mengla County, Menglun Town, G. Zheng leg.) Holotype: male, secondary tropical montane evergreen broad-leaved forest (N21º54.767', E101º11.431', alt. 880 m), 6 August 2007 (Zheng_sp61-1); Paratypes: 1 female, same data as holotype; 1 female, primary tropical seasonal rainforest (N21º57.669', E101º11.893', alt. 790 m), 7 August 2007; 2 females, primary tropical seasonal rainforest (N21º54.725', E101º13.261', alt. 734 m), 8 August 2007.

Etymology. The specific name comes from the Latin adjective undatus and means undulate, referring to the W-shape of the epigynal structure.

Diagnosis. This new species is similar to T. menglae Song and Zhao, 1994 . The differences are discussed in the “diagnosis” of T. menglae .

Description. Female (holotype): Total length 6.00. Prosoma length 2.20, width 2.10; opisthosoma length 3.70, width 2.10. Prosoma yellow with some small white markings. Tubercle grayish black with white rim. Chelicerae, gnathocoxae, labium and sternum yellow. Eye measurements: AME 0.06; ALE 0.14; PME 0.08; PLE 0.12; AME–AME 0.22; AME–ALE 0.20; PME–PME 3.40; PME–PLE 0.36. MOA length 0.32 with front width 0.34 and back width 0.48, Legs yellow. Leg formula: 1243; leg measurements: I: 10.20 (3.00, 4.00, 2.10, 1.10); II: 9.60 (3.00, 3.60, 2.00, 1.00); III: 4.50 (1.30, 1.80, 0.80, 0.60); IV: 4.60 (1.60, 1.80, 0.60, 0.60). Opisthosoma dorsum grayish white with a large black markings medially, venter gray.

Epigynum (Figs 13 E–F, 15B–C). Epigynum with a “W”-shaped ridge in the median from ventral view, under which bear a small hood, copulatory duct thick, fold and twisted, spermathecae small.

Male: Unknown.

Variation. Total length: female, 5.80–6.20. Distribution. China (Yunnan).