Therophilus nigrolineatus van Achterberg & Long 2010

Description. Holotype, ♀, length of body 5.5 mm, of fore wing 5.3 mm, ovipositor sheath 3.1 mm. Head. Antennal segments 38, length of third segment 1.8 times fourth segment, length of third, fourth and penultimate segments 4.0, 2.2 and 1.3 times their width, respectively; apical antennal segment 1.5 times as long as penultimate segment; length of maxillary palp 0.8 times height of head; malar space 1.9 times as long as basal width of mandible; temple short, in dorsal view length of eye 3.0 times temple; temple roundly narrowed posteriorly (Fig. 325); ocelli in low triangle, POL:OD:OOL = 10:6:13; face shiny, distinctly and finely punctate; frons with medial ridge, smooth; vertex and temple shiny, largely smooth, but sparsely punctulate. Mesosoma. Length of mesosoma 1.4 times its height; pronotum smooth with two carinae anteriorly and fine punctures dorsally; area near lateral carina of mesoscutum crenulate; latelal and middle lobes of mesoscutum with close distinct punctures anteriorly, medio-posteriorly slightly convex and smooth; notauli complete crenulate, narrower anteriorly and wider posteriorly (Fig. 322); scutellar sulcus 0.7 times as long as dorsal part of scutellum and with 3 carinae; scutellum distinctly narrowed posteriorly, shiny with sparse fine punctures, subposterior crest short and curved (Fig. 322); precoxal sulcus deep, strongly crenulate (Fig. 321); mesopleuron below precoxal sulcus with dense distinct punctures; mesopleuron above precoxal sulcus shiny and largely smooth, sparsely finely punctate posteriorly; metapleuron densely setose, rugose-punctate; propodeum with large areola-like area with irregular transverse carinae (Fig. 322); propodeal spiracle rather large, 1.7 times as long as wide Wings. Fore wing: second submarginal cell small and petiolate (Fig. 320); vein SR1 sinuate; r:3-SR+SR1 = 1:33. Hind wing: vein M+CU 0.7 times as long as vein 1-M. Legs. Length of hind femur, tibia and basitarsus 3.6, 7.5 and 10.0 times their width, respectively; hind femur (as remainder of legs) with short setae (Fig. 320); length of outer and inner spur of middle tibia 0.5 and 0.7 times middle basitarsus, respectively; outer side of middle tibia with a row of 5 pegs and 2 pegs at apex; length of outer and inner spur of hind tibia 0.4 and 0.5 times hind basitarsus, respectively; tarsal claws with lobe. Metasoma. First tergite parallel-sided without dorsal carinae, its length 2.2 times its apical width (Fig. 323); first and second tergites coarsely striate; second tergite with transverse curved groove (Fig. 323); remainder of metasoma smooth; ovipositor sheath 0.6 times as long as fore wing. Colour. Black; antenna dark brown but paler apically; fore leg (but coxa brown), middle tibia and tarsus yellow; hind leg black or blackish-brown; wing membrane infuscate apically and subhyaline basally (Figs 320, 328); first and second tergites white laterally. Variation. Antennal segments of females 39–40, of male 36; vein M+CU 0.8 times as long as vein 1-M; scutellum rugose-punctate or sparsely punctate; outer side of middle tibia with row of 2–3 pegs; length of body 4.0–5.5 mm, of fore wing 3.9–5.3 mm.

Distribution. S Vietnam: Dong Nai.