Streblocera (Asiastreblocera) laichauensis Mai & Long & Hiep & Hoa & Duong 2025, sp. nov.

Streblocera (Asiastreblocera) laichauensis Long, sp. nov. Figures 1, 2, 21 Type material. Holotype, ♀, labelled “Euph. 017 ” (IEBR), NW Vietnam: Lai Chau, Tam Duong, Phong Tho, forest+bushes, sweep (nets), 19.x.2004, KD Long. Diagnosis. Antenna with 19 antennomeres; scapus robust, expanded subapically, without horn subbasally; length of scapus 3.6 × its maximum width (Fig. 2A), and 1.6 × of head height (in dorsal view); malar space 0.6 × as long as basal width of mandible; mesosoma 1.65 × as long as its height; in lateral profile, propodeum highly convex medially (Fig. 1); propodeum with basal carina; surface of propodeum with transverse rugae posteriorly (Fig. 2F); first metasomal tergite distinctly widened basally, and nearly parallel behind spiracle (Fig. 2E), length of first tergite 2.3 × as long as its apical width; apical width 2.2 × as long as its minimum width. Notes. Streblocera (A.) laichauensis, sp. nov. shares the non-furcate medio-posterior projection from the fifth metasomal sternite with Streblocera (A.) olivera, Quicke & Purvis, from Thailand, but differs from the latter by having the following characters: 1) Malar space 0.6 × as long as basal width of mandible (vs 1.0 × in S. olivera); 2) Length of first metasomal tergite 2.3 × its apical width (vs 1.65 × in S. olivera); 3) Apical width of first tergite 2.5 × its minimum width (vs 3.1 × in S. olivera); and 4) Vein cu-a of fore wing nearly interstitial (vs vein cu-a postfurcal in S. olivera). Description. Holotype, ♀; body length 2.7 mm, fore wing length 2.5 mm (Fig. 1). Head. Antenna with 19 antennomeres; length of scapus 3.6 × its maximum width, face with blunt tooth-shaped horn in basal (Fig. 2B); dorsally scapus 1.6 × of head height, and head 1.7 × as wide as height; first flagellomere lanceolate, second flagellomere inserted near middle of outer side of the first flagellomere (Fig. 2D); in dorsal view, occipital carina widely incomplete medio-dorsally, width of head 1.7 × its median length, and 1.7 × width of mesoscutum (without tegulae); temple roundly narrowed behind eye; length of eye 4.25 × as long as temple; ocelli small, in high triangle, POL: OD: OOL = 4: 3: 7 (Fig. 2A); eye 2.1 × as high as broad; in lateral view, width of eye 3.5 × temple; in frontal view, diameter of antennal socket 4.0 × distance between sockets; face width 8.5 × length of face and clypeus combined, and 1.1 × height of eye; ventral margin of clypeus evenly curved; malar space 0.6 × as long as basal width of mandible, and 0.25 × as long as eye height; distance between tentorial pits 2.6 × distance from pit to eye margin; face and clypeus shiny, with finely punctures; frons coriaceous; temple and vertex polished, smooth (Figs 2A, B). Mesosoma. In lateral view, length of mesosoma 1.6 × as long as its height; notauli sparsely crenulated, narrowed posteriorly, nearly smooth (Fig. 2C); prescutellar sulcus wide and deep, 0.8 × as long as scutellum, with one carina (Fig. 2C); mesoscutum and scutellum smooth; subalar depression almost smooth; pronotal side wide, largely smooth, sparsely crenulated anteriorly; precoxal sulcus short and deep, sparsely crenulated; mesopleuron largely smooth; propodeum convex medially, with median carina occupying 0.3 basal; propodeum smooth basally, with sparse transverse rugae posteriorly (Fig. 2F). Wings. Length of fore wing 2.8 × its width; length of pterostigma 3.2 × its width, 1.45 × vein 1-R1 (Fig. 2G); vein r arising behind middle of pterostigma, 0.4 × as long as width of pterostigma, and 0.2 × vein 1-R1; vein 1-CU1 short and thick, nearly quadrate (Fig. 2G); vein cu-a 4.8 × vein 2-CU1; hind wing: M+CU: 1-M: 1r-m: 2-SC+R = 17: 4: 6: 5. Legs. Length of hind femur, tibia and basitarsus 7.5, 16.7 and 12.0 × as long as their maximum width, respectively; hind basitarsus 0.4 × hind tibia, and 0.8 × second–fifth tarsus combined; fourth hind tarsus as long as fifth tarsus (without pretarsus). Metasoma. First tergite metasomal tergite distinctly widened basally (Fig. 2E); length of first tergite 2.3 × its apical width, apical width of first tergite 2.5 × its minimum width; first metasomal tergite largely smooth basally and apically, rugo-striate medially (Fig. 2E); the rest tergites highly smooth; ovipositor sheath very short. Colour. Antenna yellow; head and mesosoma yellow; eyes silver-grey; legs and metasoma whitish yellow, except first metasomal tergite and ovipositor sheath yellowish brown; wing veins yellow; wing membrane hyaline. Male. Unknown. Host. Unknown. Etymology. Named after type locality, Lai Chau province, Northwestern Vietnam. Distribution. NW Vietnam: Lai Chau province (Tam Duong) (Fig. 21).