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 tricolorata Long , sp. nov. Figures 13 , 14 Type material . Holotype , ♀ , “Opii. 328 ” ( IEBR ), CH Vietnam : Lam Dong , Bi Doup-Nui Ba NP , forest, MT , 8.x.2017 , PT Nhi. Paratypes , 1 ♀ , “Opii. 314” ( IEBR ), the same data as holotype ; 1 ♂ , “Opii. 319” ( IEBR ), NC Vietnam : Ha Tinh , Huong Son , 18°22’N 106°13’ E 200m , April 13–19 1998 , Malaise (trap), AMNH , K. Long . Comparative diagnosis . Easily recognizable species, because of the contrast tri-coloured body ( Fig. 15 ); malar space wide and malar suture well defined ( Figs 14B, C ); malar space relatively wide compared with Vietnamese Psyttalia species , 0.8 × basal width of mandible; and ventral margin of clypeus nearly sinuate ( Fig. 14B ). Regarding the contrasting colouration of P. tricolorata , it is similar to P. spectabilis van Achterberg , from Japan , but distinctly differs from the latter by having: 1) clypeus narrow rectangular in shape, width of clypeus 2.0 × its maximum height ( Fig. 14B ) [ vs wide triangular in shape, 4.0 × its maximum height, see Fig. 95 in Wu et al. (2016) ]; 2) malar space wide and malar suture well defined ( Fig. 14B ) [ vs malar space narrow and malar suture hardly defined in P . spectabilis , see Fig. 95 in Wu et al. (2016) ]; 3) first metasomal tergite with dorsal carinae united in its middle ( Fig. 16E ) [ vs not united dorsal carinae in the middle of the tergite in P. spectabilis , see Fig. 93 in Wu et al. (2016) ]; and 4) face rugo-punctate with distinct raised carina medially ( Fig. 14B ) ( vs face moderately punctate in P. spectabilis ). Description. Holotype , ♀ , length of body 4.0 mm, fore wing 4.4 mm , ovipositor 2.1 mm ( Fig. 13 ). FIGURE 13. Habitus of Psyttalia tricolorata Long , sp. nov. , holotype, female, dorsal. Head . Antenna with 49 flagellomeres, flagellomeres bristly; first flagellomere 1.1 × as long as second; length of first and second flagellomeres 2.0 and 1.75 × their width, respectively; length of maxillary palp 0.9 × height of head; in dorsal view, head 2.0 × as wide as long medially; length of eye in dorsal view 3.8 × temple ( Fig. 14A ); frons, temple and vertex smooth ( Fig. 14A ); OOL: OD: POL = 7: 4: 4; in lateral view, medially eye 1.7 × as long as wide and 2.0 × as wide as temple ( Fig. 14C ); ventral margin of clypeus sinuate ( Fig. 14B ); width of clypeus 2.0 × its maximum height, and 0.75 × height and 0.5 width of face, respectively; hypoclypeal depression wide and deep ( Fig. 14B ); distance between tentorial pits 2.6 × distance from pit to eye margin; malar well defined; clypeus rugulose; face rugo-punctate with distinct raised carina medially ( Fig. 14B ); mandible twisted, with both teeth wide, enlarged basally and with narrow ventral carina ( Fig. 14B ); occipital carina remains far removed from hypostomal carina and dorsally largely absent; frons nearly flat, smooth ( Fig. 14A ); vertex and temple smooth. FIGURE 14. Psyttalia tricolorata Long , sp. nov. A Head, dorsal B Head, frontal C Head, lateral D Mesonotum E Metasomal tergites 1–3 F Mesopleuron G Propodeum H Metasoma I Fore wing K Hind wing. Mesosoma . Laterally, length of mesosoma 1.4 × its height; pronope absent, only with groove; pronotal side largely smooth ( Fig. 14F ); propleuron flattened; epicnemial area smooth dorsally; precoxal sulcus rather wide and deep medially, moderately crenulate anteriorly ( Fig. 14F ); remainder of mesopleuron smooth and shiny; metapleuron largely smooth, except for ventral crenulate groove and foveolate-punctate area posteriorly ( Fig. 14F ); pleural sulcus smooth ventrally; mesosternal sulcus narrow and deep, finely crenulate; postpectal carina absent; mesoscutum very shiny and nearly entirely glabrous ( Fig. 14D ); notauli with pair of partly crenulate impressions only anteriorly and groove-like depression on disc posteriorly ( Fig. 14D ); mesoscutum near flat posteriorly; scutellar sulcus narrow and deep, crenulate, slightly concave medio-posteriorly, 0.3 × as long as scutellum; scutellum slightly convex and smooth, sparsely setose apically and laterally; metanotum with short longitudinal; propodeum with rather wide and deep lateral grooves above spiracle, sparsely crenulate; surface of propodeum coriaceous, except for convergent rugo-striate area near median carina posteriorly ( Fig. 14G ). Wings . Vein 1-SR of fore wing as long as wide and not linear with 1-M; pterostigma broad triangular in shape; length of pterostigma 3.2 × as long as its width medially; vein r angled with anterior-ventral margin of pterostigma, and not linear with 3-SR ( Fig. 14I ); vein r 0.4 × as long as 2-SR; 1-R1 ending at wing apex and 1.4 × as long as pterostigma; vein M+CU1 basally unsclerotized; and r-m unpigmented; 1-SR+M sclerotized; r: 2-SR: 3-SR: r-m: SR1 = 5: 12: 18: 7: 30; vein 2-SR+M slender, 2.7 × its maximum width; 1-CU1: cu-a = 4: 5; r: 3-SR: SR1 = 5: 18: 30; 2-SR: 3-SR: r-m = 12: 18: 7; SR1 distinctly curved medially; 1-M slightly curved basally; m-cu far antefurcal, not linear with 2-SR+M and nearly parallel with 1-M ( Fig. 14I ); cu-a postfurcal, oblique; vein M+CU1 curved apically; cu-a: 1-CU1: 2-CU1= 4: 4: 22; subdiscal cell hardly narrowed anteriorly; hind wing with M+CU: 1-M: 1r-m = 19: 27: 14; cu-a straight; m-cu and SR absent ( Fig. 14K ). Legs . Length of femur, tibia and basitarsus of hind leg 3.3, 9.7 and 6.0 × as long as wide, respectively; hind basitarsus 0.4 × hind tibia, and 0.6 × second–fifth tarsus combined; inner and outer spurs 0.4 and 0.3 × as long as basitarsus, respectively; hind femur with rather dense and long setae; hind tibia and tarsus with dense and long setae. Metasoma . Length of first tergite 1.3 × its apical width, convex medio-posteriorly, its surface largely rugo-striate ( Fig. 14E ), dorsal carinae strong in basal half of tergite and nearly united in the middle of the tergite ( Fig. 14E ); second suture indistinctly indicated; second tergite enlarged ( Fig. 14E ); combined length of second and third metasomal tergites 0.6 × the remaining tergites posteriorly; first tergite depressed and smooth in 0.3 basal tergite and striate-rugulose in 0.7 apical tergite; second and following tergites smooth, shiny with long and sparse setae apically and laterally ( Fig. 14H ). Colour . Reddish yellow and black; antenna darkish brown; scapus yellow but brown laterally; head reddish yellow but stemmaticum black; palpi whitish yellow; propleuron and mesopleuron reddish yellow; metapleuron reddish yellow but black extreme posteriorly; mesonotum and propodeum reddish yellow, except extreme posteriorly black; fore and middle legs yellow, except all coxa, trochanter and trochantellus ivory or white; hind coxa, trochanter, trochantellus and femur ivory or white; hind tibia and tarsus black but hind telotarsus yellow; tegula yellow; pterostigma dark brown; wing membrane subhyaline, veins dark brown; first–fifth tergites black; sixth tergite, sternites and hypopygium ivory or white; ovipositor sheath blackish brown; ovipositor yellow. Variation . Paratype ♀ , “Opii. 314 ”, antenna with 54 flagellomeres; length of body 4.4 mm , fore wing 4.9 mm , length of visible ovipositor 2.3 mm ; paratype ♂ . “Opii. 319 ”, antenna with 40 flagellomeres remaining; length of body 4.5 mm , fore wing 4.6 mm ; and the same colour of body. Distribution . NC Vietnam : Ha Tinh (Huong Son), SH Vietnam : Lam Dong (Bi Doup-Nui Ba NP). Biology. Unknown. Etymology. From “tri” (Latin for “three”), and “coloris” (Latin for “hue, tint”), because of the tricoloured body.