The genus Pristaulacus Kieffer, 1900 (Hymenoptera: Aulacidae) in Vietnam and Northeastern Laos with descriptions of ten new species Author Pham, Nhi Thi 0001-0002-9304-9863 Institute of Ecology & Biological Resources (IEBR), Vietnam Academy of Science & Technology (VAST), 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Vietnam & Graduate University of Science & Technology, Vietnam Academy of Science & Technology (VAST), 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Vietnam ptnhi2@yahoo.com Author Long, Khuat Dang Institute of Ecology & Biological Resources (IEBR), Vietnam Academy of Science & Technology (VAST), 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Vietnam Author Dzuong, Nguyen Van 0000-0003-2363-0088 Tay Bac University, Son La, Vietnam duongdhtb@gmail.com Author Mai, Pham Quynh 0000-0002-9479-9604 Institute of Ecology & Biological Resources (IEBR), Vietnam Academy of Science & Technology (VAST), 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Vietnam & Graduate University of Science & Technology, Vietnam Academy of Science & Technology (VAST), 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Vietnam pqmai70@gmail.com Author Turrisi, Giuseppe Fabrizio 0000-0002-5258-367X Museum of Natural History “ La Specola ”, Entomology, University of Florence, via Romana, 17, 50125 Florence, Italy giuseppefabrizio.turrisi@unifi.it text Zootaxa 2024 2024-03-28 5432 2 213 249 http://dx.doi.org/10.11646/zootaxa.5432.2.4 journal article 10.11646/zootaxa.5432.2.4 1175-5326 10898639 86CDBFBF-A565-4C97-AE83-306369B48E5A Pristaulacus emarginaticeps Turner, 1922 ( Figures 18C–D , 23 ) Pristaulacus emarginaticeps Turner 1922 . Turrisi & Smith 2011: 22 , Figs 46–54 ( VIETNAM : holotype ♀ , “ Tonkin : Hoabinh. , Aug. 1918 , R.V. De Salvaza / Indo China , R.V. De Salvaza , 1919–25/ Pristaulacus emarginaticeps Turn. , Type / Type / B.M. Type Hym. 3.a.105.” (BMNH). Material examined . VIETNAM : 2♀ labelled “Aulac. 001 ” and “Aulac. 002 ” ( IEBR ), NW Vietnam : Son La , Chieng Sinh , forest, MT , 15 – 25.v.2021 , KD Long , NV Dzuong . Diagnostic characters (based on specimens collected in Vietnam ). Female, body length: 10.1 mm ; antenna length: 5.2 mm ; fore wing length: 8.2 mm ; ovipositor length: 8.4 mm . Median occipital groove deep, U-shaped; occipital carina narrow, 0.2–0.3 × diameter of an ocellus, obsolescent medially; vertex and temple with fine, and scattered to dense punctures (distance between punctures 2.0–3.0 × puncture diameters); clypeus with coarse, deep and dense punctures on basal half; frons with dense fine punctures; scape 1.3 × length pedicel; first flagellomere 1.3 × as long as scape, and 0.6 × length of second flagellomere; pronotum, in lateral view, with two projecting tooth-like processes, anterior tooth-like process obtuse; scutellum areolate rugose; fore wing with vein 1-M 0.7 × vein 1m-cu; vein 1cu-a antefurcal; r: 3-Rs = 17: 17; 2-Rs+M short; discal cell subrectangular; 2-Ma: 3-Ma: 3-Mb = 26: 9: 13; subapical hind coxal groove sparsely setose; apical hind trochanteral groove deep, smooth ( Fig. 18D ); trochantellus distinct; tarsal claw with 5 tooth-like processes ( Fig. 18C ); fore wing membrane smoky brown, with large blackish brown spot, occupying basal half of marginal and second submarginal cells and apical half of the first submarginal cell; vein 3-Ma much shorter than vein 3-Mb; vein cu-a slightly antefurcal; vein 2r-m perpendicular to vein 3-Ma; petiole elongate, slender, slightly widened apically, 5.0 × its apical width; ovipositor slightly longer than fore wing. Distribution . Northwestern Vietnam ( Hoa Binh province , Turrisi & Smith 2011: 22 ); Northwestern Vietnam ( Son La province : labelled “Aulac. 001 ” and “Aulac. 002 ” in this paper) ( Fig. 23 ); Laos ( Houaphanh province , Kuroda 2018 , figs) Remarks . Type material examined by Turrisi G.F., see Turrisi & Smith (2011) for redescription.