Streblocera (Eutanycerus) neutra Mai & Long & Hiep & Hoa & Duong 2025, sp. nov.

Streblocera (Eutanycerus) neutra Long, sp. nov. Figures 7, 8, 21 Type material. Holotype, ♀, labelled “Euph. 342 ” (IEBR), NW Vietnam: Son La, Thuan Chau, Co Ma, forest, UV light trap, 5.v.2017, PT Nhi. Diagnosis. S. (E.) neutra, sp. nov. is relatively close to S. (E.) uncifera Li et. Al, 2020, from China, but differs from the latter by having: 1) Antenna with 26 antennomeres (vs 24 in S. uncifera); 2) First to seventh flagellomeres with blunt serrations (vs in S. uncifera see Fig. 14D in Li et al. 2020); 3) First tergite elongate, 2.0 × longer than its apical width (vs 1.7 × in S. uncifera), and apical width 2.8 × longer than its minimum width (vs 3.4 × in S. uncifera). Regarding ventral serrations of first– seventh flagellomeres, S. (E.) neutra, sp. nov. is also close to S. (E.) hsiufui You, 1993, but differs by having: 1) Ventral serrations of first-seventh flagellomeres without hook-shaped prominence apically (vs hook-shaped prominence apically in S. hsiufui); 2) Scapus 7.5 × longer than its maximum width (vs 8.5 × in S. hsiufui); 3) First metasomal tergite 2.0 × (vs 2.3 × in S. hsiufui) longer than its apical width, and 2.8 × (vs 3.1 × in S. hsiufui) longer than its minimum width; and 4) ovipositor curved upwards (ovipositor wave-like bent in S. hsiufui). Description. Holotype, ♀, length of body 6.0 mm, fore wing 5.5 mm, ovipositor 0.6 mm (Fig. 7). (antenna 5.6 mm) Head. Antenna with 26 antennomeres; length of scapus (without baso-ventral pointed horn) 7.3 × its maximum width, with tooth-shaped horn in basal 0.4 of scapus (Fig. 8F); scapus 2.5 × of head height; first flagellomere 2.0 × second flagellomere; second-seventh flagellomeres serrate ventrally (Fig. 8G); length from eighth flagellomere to apex of antenna subequal to scapus; in dorsal view, occipital carina nearly complete medio-dorsally (Fig. 8A), width of head 1.6 × its median length, and 1.4 × width of mesoscutum (without tegulae); temple roundly narrowed behind eye; length of eye 1.5 × as long as temple; ocelli small, POL: OD: OOL= 5: 4: 14 (Fig. 8A); eye 1.5 × as high as broad; in lateral view, transverse diameter of eye 1.9 × temple; in frontal view, head obliquely narrowed below (Fig. 8B); diameter of antennal socket 4.5 × distance between sockets, face width as long as length of face and clypeus combined, and 1.3 × height of eye; clypeus margin straight; malar space 0.8 × as long as basal width of mandible, and 0.25 × as long as eye height; distance between tentorial pits 1.5 × distance from pit to eye margin; face in upper part with median smooth groove between antennal sockets, densely setose in lower part; clypeus with dense setae (Fig. 8B); frons flat, with dense striate rugosities direct to antennal sockets; temple and vertex polished, with sparse fine punctures (Fig. 8A). Mesosoma. In lateral view, length of mesosoma 1.6 × as long as its height in lateral view; notauli narrowed anteriorly, sparsely crenulated, widened posteriorly with median carina in rugose area (Fig. 8D); prescutellar sulcus wide and deep, 0.8 × as long as scutellum, scutellum smooth; median lobe of mesoscutum coriaceous; lateral lobes smooth; subalar depression rugose; pronotal side sparsely crenulated medially, smooth dorsally and ventrally (Fig. 8E); precoxal sulcus long and wide, crenulated; mesopleuron smooth; metapleuron transversely rugose; propodeum with short basal carina-like rugosity, transversely rugose medio-posteriorly (Fig. 8C). Wings. Length of pterostigma 3.50 × its width, 1.25 × vein 1-R1 (Fig. 8I); vein r arising distinctly behind middle of pterostigma, 0.5 × as long as width of pterostigma, and 0.2 × vein 1-R1; r: 2-SR = 5: 25; vein cu-a postfurcal; vein cu-a: 1-CU1: 2-CU1 = 6: 4: 24 (Fig. 8I); hind wing: 1-M: 1r-m: 2-SC+R = 8: 11: 15. Legs. Length of hind femur, tibia and basitarsus 9.0, 17.5 and 14.0 × as long as their maximum width, respectively; hind basitarsus 0.4 × hind tibia; hind basitarsus 0.5 × hind tibia combined, and subequal to second–fifth tarsus; fourth hind tarsus 0.7 × as long as fifth tarsus (without pretarsus). Metasoma. Length of first tergite 2.0 × its apical width, apical width of first tergite 2.9 × its minimum width; ovipositor sheath 0.1 × length fore wing, and 0.5 × length first tergite; ovipositor flat, weakly sinuate; first metasomal tergite smooth in basal half, with oval striae medially and convergent striae apically (Fig. 8H); the remainder highly smooth. Colour. Head and mesosoma yellow; eyes silver-grey; legs and metasoma pale yellow, except first metasomal tergite yellowish brown; ovipositor sheath; pterostigma pale brown, yellow basally; wing veins yellow; wing membrane hyaline (Fig. 8H). Male. Unknown. Host: Unknown. Etymology. “ neuter ”, Latin meaning neither one nor the other. Distribution. NW Vietnam: Son La province (Fig. 21).