The genus Psyttalia Walker (Hymenoptera, Braconidae) in Vietnam: descriptions of seven new species and their host information Author Oanh, Nguyen Thi 0000-0002-3265-0580 Dong Thap University, Cao Lanh City, Dong Thap, Vietnam. ntoanh@dthu.edu.vn Author Long, Khuat Dang 0000-0002-9237-7344 Institute of Ecology & Biological Resources (IEBR), Vietnam Academy of Science & Technology (VAST), 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Vietnam. Author Xuan, Trinh Thi 0009-0002-0513-7922 College of Agriculture, Can Tho University, Can Tho, Vietnam. trinhthixuan@ctu.edu.vn Author Tinh, Duong Van 0009-0008-3445-7929 Master student of Plant Protection, College of Agriculture, Can Tho University, Can Tho City, Viet Nam. dvtinhdt@gmail.com Author Nghiep, Hoang Thi 0000-0003-3000-8049 Dong Thap University, Cao Lanh City, Dong Thap, Vietnam. htnghiep@dthu.edu.vn text Zootaxa 2024 2024-07-05 5477 1 1 26 http://dx.doi.org/10.11646/zootaxa.5477.1.1 journal article 10.11646/zootaxa.5477.1.1 50a8faaf-519d-4fcc-9824-1c735496846e 1175-5326 12681370 9F6054CD-B712-4150-A3C3-7C6A4788C002 Psyttalia nigristriata Long , sp. nov. Figures 7 , 8 Type material . Holotype , ♀ , “Opii. 310” ( IEBR ), NE Vietnam : Tuyen Quang , Na Hang , Thanh Tuong , forest, 22°19’01’’N 105°24’02’’E 162m , MT , 5.xii.2016 , KD Long. Paratypes , 3 ♀ , “Opii. 309” ( IEBR ), the same locality as holotype, but 15.i.2017 , KD Long ; “Opii. 026” ( IEBR ), NW Vietnam : Hoa Binh , Yen Thuy , Lac Thinh , sugarcane plantation, 20°23’45’’N 105°34’22’’E 100m , MT , 10.ix.2002 , KD Long ; Opii. 275” ( IEBR ), NW Vietnam : Son La , fruit orchard, 21°18’03’’N 103°55’38’’E 671m , MT , 25.v.2016 , KD Long . Comparative diagnosis. Psyttalia nigristriata , sp. nov. shares with P. hoabinhensis and P tricolorata the relatively short vein r of fore wing and the first subdiscal cell of fore wing nearly parallel-sided posteriorly, but is easily recognized as follows: 1) dark brown stripes on metasomal tergites 1–3 ( Fig. 8E ) [( vs entirely yellow in P. hoabinhensis , sp. nov. ( Fig. 4F ) or black P. tricolorata , sp. nov. ( Figs 14E, H )]; 2) precoxal sulcus narrow, fused punctures and crenulae ( Fig. 8F ) ( vs sulcus wider, distinctly crenulate in in P. hoabinhensis and P. tricolorata ( Figs 4E , 14F ); and 3) pterostigma narrow triangular in shape, 3.7 × as long as wide medially ( vs broad triangular in shape, 3.0–3.2 × as long as wide medially). FIGURE 7. Habitus of Psyttalia nigristriata Long , sp. nov. , holotype, female, dorsal. Description. Holotype , ♀ , length of body 2.8 mm , fore wing 3.0 mm, ovipositor 1.0 mm ( Fig. 7 ). Head . Antenna complete, 35 flagellomeres, flagellomeres bristly; first flagellomere as long as second and 3.5 × their width; length of maxillary palp subequal to height of head; in dorsal view, head 2.1 × as wide as long medially; length of eye in dorsal view 5.0 × temple ( Fig. 8A ); temple shiny, smooth and with sparse setae; OOL: OD: POL = 6: 3: 3; in lateral view, medially eye 1.7 × as long as wide and 4.0 × as wide as temple; in frontal view, width of clypeus 3.0 × its maximum height, as long as face height and 0.6 × width of face ( Fig. 8B ); ventral margin of clypeus evenly convex medially ( Fig. 8B ); hypoclypeal depression narrow and deep ( Fig. 8B ); distance between tentorial pits 2.5 × distance from pit to eye margin; malar suture absent; malar space narrow, 0.4 × basal width of mandible; clypeus punctate; face rugo-punctate with distinct raised carina medially ( Fig. 8B ); mandible rather robust, apically with both teeth wide, normal basally and with narrow ventral carina; occipital carina remains far removed from hypostomal carina and dorsally largely absent; frons nearly flat, depressed laterally, without round pit between antennal sockets, smooth medially ( Fig. 8A ); vertex and temple smooth. FIGURE 8. Psyttalia nigristriata Long , sp. nov. A Head, dorsal B Head, frontal C Head, lateral D Mesonotum E Metasoma F Mesopleuron G Propodeum H Fore wing I Hind wing. Mesosoma . Laterally, length of mesosoma 1.3 × its height; pronotal side largely smooth, with deep median groove ( Fig. 8F ); propleuron flattened; epicnemial area smooth dorsally; precoxal sulcus narrow, crenulate medially, punctate anteriorly and posteriorly ( Fig. 8F ); remainder of mesopleuron smooth and shiny; pleural sulcus smooth ventrally; mesosternal sulcus narrow and finely crenulate; postpectal carina absent; mesoscutum very shiny and nearly glabrous ( Fig. 8D ); notauli only anteriorly as pair of smooth pit-like impressions and largely absent on disc, mesoscutum flat posteriorly; scutellar sulcus deep and narrow, nearly parallel-sided medially, 0.2 × as long as scutellum, with 3 crenulae; scutellum slightly convex and smooth, only sparsely setose apically and laterally; metanotum with short carina; surface of propodeum smooth, except for short transverse crenulae median carina medio-posteriorly, and with convergent lateral grooves above spiracle ( Fig. 8G ). Wings . Vein 1-SR of fore wing as long as wide and nearly linear with 1-M; pterostigma narrow triangular in shape; length of pterostigma 3.7 × as long as its width medially ( Fig. 8H ); 1-R1 ending at wing apex and 1.8 × as long as pterostigma; vein exiting before middle of pterostigma, linear with antero-ventral margin of pterostigma, and not linear with vein 3-SR; 1-SR+M more or less sclerotized; vein r-m unsclerotized, r: 2-SR: 3-SR: r-m: SR1 = 5: 13: 18: 7: 41; subdiscal cell hardly narrowed anteriorly; vein r 0.4 × 2-RS; 2-SR+M 2.7 × its maximum width; 1-CU1: cu-a = 3: 4; r: 3-SR: SR1 = 5: 18: 41; 2-SR: 3-SR: r-m = 13: 18: 7; 1-M straight; m-cu far antefurcal, not linear with vein 2-SR+M and slightly curved, subparallel with 1-M ( Fig. 8H ); cu-a oblique, and far postfurcal; 1-CU1 widened basally; 1-CU1: 2-CU1: cu-a = 3: 13: 4; only apex of M+CU1 sclerotized, pigmented basally; vein r-m unsclerotized ( Fig. 10H ); vein SR1 nearly straight; subdiscal cell hardly narrowed anteriorly. Hind wing: M+CU: 1-M: 1r-m = 13: 17: 9; cu-a straight, unsclerotized apically; m-cu and SR absent ( Fig. 8I ). Legs . Length of femur, tibia and basitarsus of hind leg 3.9, 8.0 and 5.0 × their width, respectively; hind basitarsus 0.4 × hind tibia, and 0.6 × second–fifth tarsus combined; inner and outer spurs and as long as basitarsus, respectively; hind tibia and tarsus with long setae. Metasoma . Length of first tergite 1.1 × its apical width, convex medio-posteriorly, its surface largely smooth basally, rugo-striate medio-apically ( Fig. 8E ), dorsal carinae strong in basal half of tergite and with depressed area below; second suture not indicated; combined length of second and third metasomal tergites 0.4 × the remaining tergites posteriorly; first tergite superficially coriaceous; second and following tergites smooth, shiny and sparsely setose apically and laterally. Colour . Yellow and dark brown; antenna brown; head yellow but stemmaticum black; palpi pale yellow; propleuron, mesopleuron and metapleuron yellow; mesonotum yellow; metanotum brown; propodeum yellow anteriorly, brown posteriorly; fore and middle legs yellow, except coxa whitish yellow and tarsus yellowish brown; hind coxa and femur yellow; hind tibia and tarsus brown; tegula pale yellow; pterostigma brown entirely; wing membrane hyaline, veins brown; first tergite brown; second tergite yellowish brown medially, yellow laterally; third and fourth tergites largely brown basally, yellow apically and ventrally; fifth tergite largely brown, yellow laterally; the remainder yellow; sternites and hypopygium yellow; ovipositor sheath brown; ovipositor brownish yellow. Variation . Paratype , 3♀ , antenna with 31–45 flagellomeres; length of body 2.3–3.3– 3.8 mm , fore wing 2.7–3.8 mm , length of visible ovipositor 1.0– 2.2 mm . Male. Unknown. Distribution . NE Vietnam ( Tuyen Quang ); NW Vietnam ( Hoa Binh , Son La ). Biology. Unknown. Etymology. From “niger” (Latin for “black, dark, dusky”), in reference to the transverse dark brown stripes basally on the third–fifth metasomal tergites.