Holotype, ♀ (ZUH), “S. China: Hunan, Yongzhou, Jiangyong, Yuankou, 28.VI.1988, Jian-Ping Liu, No. 184”.

Length of eye about 2.0 times temple in dorsal view; hypoclypeal depression medium-sized (Fig. 321); ventral half of posterior groove of pronotal side crenulate; precoxal sulcus moderately wide and crenulate (Fig. 314); anterior groove of metapleuron crenulate; medio-posterior depression of mesoscutum large, round and deep (Fig. 317); propodeum with medio-longitudinal carina anteriorly (Fig. 317); vein 1r-m of hind wing about 1.3 times as long as vein 1-M (Fig. 316); area below pterostigma hyaline; first tergite about as long as wide (Fig. 318).

Holotype, ♀, length of body 3.0 mm, of fore wing 2.8 mm.

Head. Antenna with 23+ segments; third segment 1.3 times as long as fourth segment, length of third and fourth segments 2.2 and 1.7 times their width, respectively (Fig. 319); length of maxillary palp 0.7 times height of head; labial palp segments slender; occipital carina rather close to hypostomal carina and dorsally absent; hypostomal carina wide; length of eye in dorsal view 2.0 times temple; frons medially convex, depressed behind antennal sockets, smooth and glabrous (Fig. 322); face coarsely punctate, setose and medially widely elevated (Fig. 320); width of clypeus 2.6 times its maximum height and 0.6 times width of face; clypeus convex, protruding forwards and punctate and its ventral margin slightly concave and thick (Figs 320, 321); hypoclypeal depression medium-sized (Fig. 321); malar suture deep; length of malar space 0.6 times basal width of mandible; mandible triangular and with narrow ventral carina (Fig. 321).

Mesosoma. Length of mesosoma 1.3 times its height; pronotal side largely smooth, but medial groove and oblique groove coarsely crenulate (Fig. 314); epicnemial area mainly smooth dorsally, but finely crenulate laterally; precoxal sulcus moderately wide and crenulate; remainder of mesopleuron smooth (Fig. 314); pleural sulcus smooth; anterior groove of metapleuron crenulate; notauli absent on disc, only anteriorly indicated by shallow depressions (Fig. 317); mesoscutum glabrous except for row of long setae along notaulic courses; medio-posterior depression of mesoscutum large, round and deep (Fig. 317); scutellar sulcus wide and coarsely crenulate (Fig. 317); scutellum slightly convex medially, smooth; propodeum with nearly complete medio-longitudinal carina and remainder largely reticulate-rugose (Fig. 317).

Wings. Fore wing (Fig. 315): pterostigma triangular; 1-R1 not reaching wing apex and 1.2 times as long as pterostigma; r:3-SR:SR1 = 17:42:67; 2-SR:3-SR:r-m = 30:42:17; r long; 1-M distinctly curved, SR1 nearly straight; m-cu postfurcal; cu-a subinterstitial; first subdiscal cell closed, CU1b medium-sized; apical third of M+CU1 desclerotized. Hind wing (Fig. 316): M+CU:1-M:1r-m = 37:21:27; cu-a straight; m-cu completely absent.

Legs. Length of femur, tibia and basitarsus of hind leg 3.5, 7.0 and 4.0 times as long as wide, respectively; hind femur and tibia with medium-sized setae (Fig. 323).

Metasoma. Length of first tergite 1.1 times its apical width, its surface longitudinally striate and evenly convex medially (Fig. 318); second and following tergites smooth; length of ovipositor sheath 0.5 times (setose part 0.4 times) as long as hind tibia (Figs 314, 324).

Colour. Dark brown; head (except medio-dorsally and posteriorly), notaulic courses, tegulae, ovipositor sheath yellowish-brown; palpi and legs yellow; pterostigma and veins brown; wing membrane subhyaline.

*China (Hunan).

Name derived from “latus” (Latin for “wide”) and “penna” (Latin for “wing”), because of the wide hind wing.

The new species runs in the key by Chen and Weng (2005) with some difficulty to Opius aquacaducus Chen & Weng, 2005, but Rhogadopsis latipennis has normal mandibles (asymmetrical in Opius aquacaducus), the medio-posterior depression is round (droplet-shaped) and the scutellum is slightly convex (strongly tuberculate convex). Rhogadopsis tabidula(Weng & Chen, 2005) comb. n. andRhogadopsis pratellae(Weng & Chen, 2005) comb. n. are similar but have vein 1r-m of hind wing less enlarged (about as long as vein 1-M and about 1.3 times in Rhogadopsis latipennis) and the setose part of the ovipositor sheath is either shorter (0.3 times hind tibia in Rhogadopsis tabidula) or longer (0.6 times hind tibia in Rhogadopsis pratellae) than in Rhogadopsis latipennis (0.4 times hind tibia). Rhogadopsis tabidula has a droplet shaped medio-posterior depression of the mesoscutum (round in Rhogadopsis latipennis) and the anterior half of the notauli present on the disc (as in Rhogadopsis latipennis; absent in Rhogadopsis tabidula).