Holotype, ♂ (ZUH), “S. China: Hunan, Taoyuan, Wuyunjie Mts., Houxi, 6–8.VI.2010, 500 m, Xi-Ying Li, No. 38”.

Pronotal side smooth (Fig. 247); head moderately transverse and yellow; clypeus comparatively narrow, truncate ventrally, semi-circular and about 3.5 times as wide as high (Fig. 252); vein SR1 of fore wing 1.9 times as long as vein 3-SR; mesosoma completely pale yellow; propodeum, second and third metasomal tergite smooth (Figs 249, 250); first tergite superficially granulate (Fig. 250); anterior groove of metapleuron smooth; apical half of first metasomal tergite subparallel-sided (Fig. 250); occipital carina far removed from hypostomal carina; malar suture absent; hind tarsus pale yellowish as basal half of hind tibia; length of malar space 0.3 times basal width of mandible; third antennal segment about 3.5 (♂) times as long as wide; antenna 1.6 times longer than fore wing; face ivory and mesosoma pale yellowish; first tergite twice as long as wide apically (Fig. 240).

Holotype, ♂, length of body 1.7 mm, of fore wing 1.9 mm.

Head. Antenna with 27 segments and 1.4 times as long as fore wing; length of third segment 1.1 times fourth segment, length of third, fourth and penultimate segments 3.3, 3.0 and 2.8 times their width, respectively (Fig. 255); length of maxillary palp about equal to height of head; labial palp segments normal; occipital carina far removed from hypostomal carina and dorsally absent; hypostomal carina narrow; length of eye in dorsal view 4.0 times temple; frons smooth, glabrous, flattened (Fig. 254); face smooth, glabrous, medially weakly elevated (Fig. 252); width of clypeus 3.3 times its maximum height and 0.6 times width of face; clypeus comparatively narrow and truncate medially, normal ventrally and semi-circular, its ventral margin thin and straight (Figs 252, 253); hypoclypeal depression large (Fig. 252); malar suture absent; length of malar space 0.3 times basal width of mandible gradually widened basally, with a ventral carina (Fig. 253).

Mesosoma. Length of mesosoma 1.4 times its height; dorsal pronope absent; pronotal side smooth; epicnemial area smooth dorsally (Fig. 247); precoxal sulcus only medially impressed, smooth; rest of mesopleuron smooth, glabrous; pleural sulcus smooth; anterior groove of metapleuron smooth; notauli absent on disc, only anteriorly indicated by shallow depressions (Fig. 249); mesoscutum glabrous except for a few setae along imaginary notaulic courses; medio-posterior depression of mesoscutum absent; scutellar sulcus finely crenulate; scutellum smooth and flattened; surface of propodeum smooth (Fig. 249).

Wings. Fore wing (Fig. 248): pterostigma triangular; 1-R1 reaching wing apex and 1.6 times as long as pterostigma; r:3-SR:SR1 = 2:33:60; 2-SR:3-SR:r-m = 20:33:9; r rather short; 1-M slightly curved; SR1 nearly straight; m-cu postfurcal; cu-a slightly postfurcal and 1-CU1 widened; first subdiscal cell closed, CU1b medium-sized. Hind wing (Fig. 248): M+CU:1-M:1r-m = 22:18:9; cu-a straight; m-cu absent.

Legs. Length of femur, tibia and basitarsus of hind leg 7.0, 10.0 and 6.0 times as long as wide, respectively; hind femur with long setae and of tibia medium-sized (Fig. 256).

Metasoma. Length of first tergite 1.5 times its apical width, its surface moderately convex and largely finely rugose, dorsal carinae united in its anterior 0.5 and absent behind it (Fig. 250); second and following tergites smooth.

Colour. Yellow; antenna, pronotal side, mesopleuron, tegulae, pale yellowish; face, mandible, clypeus, palpi, malar space and legs ivory; pterostigma brown, veins yellowish-brown; wing membrane subhyaline.

Molecular data.None.

*China (Hunan).

Unknown.

Name derived from “flavus” (Latin for “yellow”) and “soma” (Greek for body), because of the yellow body.

The new species runs in the key by Chen and Weng (2005) to Phaedrotoma rugulosa (Chen & Weng, 2005) comb. n. and differs by having the clypeus 3.5 times wider than high (2.4 times in Phaedrotoma rugulosa), the malar space 0.3 times basal width of mandible (about 0.8 times), vein m-cu of fore wing far postfurcal (subinterstitial) and the triangular pterostigma (narrow elliptical).