Psyttalia hoabinhensis Long, sp. nov.

Figures 3, 4

Type material. Holotype, ♀, “Opii. 087” (IEBR), NW Vietnam: Hoa Binh, Yen Thuy, Hang Tram, fruit orchard, 20°23’47’’N 105°36’14’’E 55m, MT, 25.iv.2002, KD Long.

Paratype 1♀ “Opii. 091 ” (IEBR), ibid. but 10.v.2003, KD Long .

Comparative diagnosis. Psyttalia hoabinhensis, sp. nov. is close to P. nigristriata, sp. nov., with differences between the two species given in the key. Psyttalia hoabinhensis, sp. nov. is also similar to P. majocellata Wu & van Achterberg, from China, but differs from the latter by having: 1) posterior margin of scutellar sulcus deeply concave medially (Fig. 4D) (vs scutellar sulcus parallel-sided in P. majocellata, see Fig. 47 in Wu et al. 2016); 2) vein 2- SR 0.75 as long as 3-SR (Fig. 4H) (vs 0.50 in P. majocellata see Fig. 45 in in Wu et al. 2016); and 3) propodeum (female) with median carina part very short and without reversed Y-shaped posteriorly (Fig. 4G) (vs propodeum with median carina part rather short and reversed Y-shaped posteriorly, see Figs 46, 64 in Wu et al. 2016).

Description. Holotype, ♀, length of body 2.9 mm, fore wing 3.0 mm, length of visible ovipositor 1.5 mm (Fig. 3).

Head. Antenna complete, with 36 flagellomeres, flagellomeres bristly; first flagellomere as long as second; length of first and second flagellomeres 2.0 and 2.0 × their width, respectively; length of maxillary palp 0.9 × height of head; in dorsal view, head 1.9 × as wide as long medially; length of eye in dorsal view 4.0 × temple (Fig. 4A); temple shiny, smooth except for some punctures posteriorly and with sparse setae; OOL: OD: POL = 7: 4: 3 (Fig. 4A); in lateral view, medially eye 1.7 × as long as wide and 2.2 × as wide as temple (Fig. 4C); ventral margin of clypeus slightly concave medially (Fig. 4B); width of clypeus 3.0 × its maximum height, as long as eye height and 0.6 × width of face (Fig. 4B); hypoclypeal depression wide and deep (Fig. 4B); distance between tentorial pits 3.0 × distance from pit to eye margin; malar suture absent; malar space narrow, 0.4 × basal width of mandible; clypeus rugulose; face nearly coriaceous (Fig. 4B); mandible twisted, apically moderately narrowed and with both teeth wide, normal basally and with narrow ventral carina (Fig. 4B); occipital carina remains far removed from hypostomal carina and dorsally largely absent; frons nearly flat, slightly depressed laterally, with round pit between antennal sockets, largely smooth (Fig. 4A); vertex and temple smooth.

Mesosoma. Laterally, length of mesosoma 13.0 × its height; pronotal side largely smooth, but anterior groove present (Fig. 4E); propleuron flattened, sparsely setose; epicnemial area smooth dorsally; precoxal sulcus rather wide medially, sparsely crenulate (Fig. 4E); remainder of mesopleuron smooth and shiny; pleural sulcus smooth ventrally; mesosternal sulcus shallow and narrow and sparsely crenulate; postpectal carina absent; mesoscutum very shiny and nearly entirely glabrous (Fig. 4D); notauli only anteriorly as pair of partly crenulate impressions and largely absent on disc, mesoscutum flat posteriorly; scutellar sulcus deep, 0.3 × as long as scutellum, with 4 crenulae, its posterior margin deeply concave medially (Fig. 4D); scutellum slightly convex and smooth, only laterally setose; metanotum with longitudinal carina medially; surface of propodeum smooth, except transverse rugosities subapically and with short lateral smooth groove above spiracle, fused into depressed area of propodeum posteriorly (Fig. 4G).

Wings. Vein 1-SR of fore wing angled with 1-M; pterostigma swollen, broad triangular in shape (Fig. 4H); vein r exiting from middle of pterostigma and linear with antero-ventral border of pterostigma (Fig. 4H); length of pterostigma 3.0 × as long as its width medially; 1-R1 ending at wing apex and 1.6 × as long as pterostigma; vein r emitted from middle of pterostigma and linear with antero-ventral margin of pterostigma and vein 3-SR; r-m and most of S-shaped 1-SR+M unsclerotized; subdiscal cell hardly narrowed anteriorly; r: 2-SR: 3-SR: r-m: SR1 = 5: 12: 16: 6: 33; vein 2-SR+M of fore wing widened, 2.0 × as long as its maximum width; r: 3-SR: SR1 = 5: 16: 33; 2-SR: 3-SR: r-m = 12: 16: 6; 1-M straight; m-cu narrowly antefurcal, slightly curved, linear with 2-SR+M (Fig. 4H); 1-CU1 widened; cu-a oblique, postfurcal; 1-CU1: cu-a: 2-CU1 = 3: 5: 15; vein SR1 slightly curved medially; subdiscal cell hardly narrowed anteriorly. Hind wing: vein M+CU as long as 1-M; M+CU: 1-M: 1r-m = 11: 11: 6; cu-a straight; vein SR absent (Fig. 4I).

Legs. Length of femur, tibia and basitarsus of hind leg 3.3, 8.0 and 4.3 × as long as wide, respectively; hind basitarsus 0.3 × hind tibia, and 0.5 × second–fifth tarsus combined; inner and outer spurs 0.4 and 0.3 × as long as basitarsus, respectively; hind femur with sparse short setae; hind tibia and tarsus with dense, long setae.

Metasoma. Length of first tergite as long as its apical width, convex medio-posteriorly, its surface coriaceous, except irregular sculpture medio-apically; dorsal carinae rather strong, nearly converging and extending to apex of tergite; 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 (Fig. 4F).

Colour. Yellow; antenna yellow basally, brownish yellow apically; head yellow but stemmaticum brown; palpi and; mesosoma yellow; all legs yellow, except hind tarsus yellowish brown; tegula yellow; pterostigma entirely yellow; wing membrane subhyaline, veins brownish yellow; metasoma entirely yellow; ovipositor sheath brown; ovipositor yellow.

Variation. Paratype, ♀, “Opii. 091 ”, antenna with 33 flagellomeres; length of body 2.6 mm, fore wing 2.6 mm, length of visible ovipositor 1.2 mm.

Male. Unknown.

Distribution. NW Vietnam: Hoa Binh (Yen Thuy).

Biology. Unknown.

Etymology. Named after the holotype locality, Hoa Binh province, Northwest Vietnam.