Rhyacobates abdominalis Andersen & Chen, 1995

Rhyacobates abdominalis Andersen & Chen, 1995: 58 –59, Figs. 12–15 (type locality: Ruyang Nat. Res., Guangdong Prov., China); Tran & Yang, 2006: 19 (record Vietnam).

Material examined. Paratypes: 1 male, 1 female (apterous), “ China: Guangdong Prov., Ruyang Nat. Res., Lao Peng Keng stream, 1100m, 14.8.1990, coll. P.P. Chen, C9012” (NHMW). For formerly examined specimens (from Vietnam), see Tran & Yang (2006).

Size. Males, length 6.8–7.0, width 2.10–2.20 (apterous), length 6.4–6.6, width 2.06–2.11 (macropterous, dealated); females, length 9.9–10.0, width 3.50 (apterous), length 9.4–9.6, width 3.14–3.30 (macropterous, dealated).

Remarks. Rhyacobates abdominalis can be recognised by the following diagnostic characters: abdominal segment 8 of the male is ventrolaterally impressed; the proctiger of the male has a small angular projection on each side; the male paramere is slender with a broad basal part and hook-shaped apex (see Andersen & Chen 1995: Fig. 15); the abdomen of the female is distinctly curved dorsad, abdominal segment 7 possesses a short projection on each connexivum, and the posterior margin of sternum 7 has a sharp, small median process (see Andersen & Chen 1995: Figs. 12–14). The specimens of R. abdominalis from Vietnam were not significantly different compared to the paratypes from China, except for the larger size and less pointed median process of sternum 7 in the female. They were collected from the same habitat as Rhyacobates gongvo . For description notes of Vietnamese specimens, see Tran & Yang (2006: 19).

Habitats. See Tran & Yang (2006: 18, 19).

Distribution. Vietnam: Lao Cai. China: Guangdong.