Streblocera (Eutanycerus) intermedia Long, 2020

Long, Khuat Dang & Nhi, Pham Thi, 2020, Notes on the genus Streblocera Westwood, 1883 (Hymenoptera: Braconidae: Euphorinae) from Vietnam, with description of four new species, Zootaxa 4767 (3), pp. 402-414 : 404-406

Streblocera (Eutanycerus) intermedia Long , sp. n.

( Figs 1–11 )

Material examined. Holotype, ♀, “Euph. 117 ” ( IEBR), NW Vietnam: Hoa Binh, Yen Thuy , forest, MT 20°23’N 105°34’E, 300m, 10–20.iii.2002, KD Long . Paratypes, 2 ♀, “Euph. 118 ”, “Euph. 119 ” ( IEBR), locality as holotype; 1 ♀ “Euph. 111 ” ( IEBR), ibid. but 01–10.iv.2002, KD Long.

Diagnosis. Antenna with 21 antennomeres; scapus slender, with tooth-shaped horn in basal 0.2 of scapus ( Fig. 8 ); length of scapus 7.8 × its maximum width, and 2.0 × of head height (in dorsal view); tentorial pits at lower level of eyes ( Fig. 3 ); malar space 1.5 × as long as basal width of mandible; mesosoma 1.6 × as long as its height; propodeum rugose baso-laterally, areolate-rugose medially and apically; first metasomal indistinctly narrowed behind spiracle, 2.45 × as long as its apical width; apical width 2.75 × as long as its minimum width.

Description. Holotype, ♀; body length. 3.5 mm, fore wing length 3.1 mm, ovipositor sheath 0.5 mm ( Fig. 1 ).

Head. Antenna with 21 antennomeres; scapus slender, length of scapus 7.8 × its maximum width (47: 6), with tooth-shaped horn in basal 0.2 of scapus; scapus 2.0 × of head height (47: 23); third antennomere 1.2 × fourth (6: 5); second-seventh flagellomeres serrate ventrally ( Fig. 7 ); length from eighth flagellomere to apex of antenna equal to scapus (47: 47); in dorsal view, width of head 1.6 × its median length (37: 23), and 1.6 × width of mesoscutum (without tegulae) (37: 23); temple roundly narrowed behind eye; length of eye 1.85 × as long as temple (13:7); ocelli small, POL: OD: OOL = 3: 2: 8 ( Fig. 2 ); eye 2.85 × as high as broad (20: 7); in lateral view, transverse diameter of eye twice length of temple (14: 7); in frontal view, diameter of antennal socket 0.9 × between sockets (9: 10), diameter of antennal socket as long as distance between sockets (7: 7), face width equal to length of face and clypeus combined, and 1.2 × height of eye (18: 15); clypeus margin straight; malar space 1.5 × as long as basal width of mandible (6: 4), and 0.4 × as long as eye height (6: 16); distance between tentorial pits 1.6 × distance from pit to eye margin (8: 5); face finely punctate; clypeus with dense fine punctures ( Fig. 3 ); frons rugo-punctate ( Fig. 2 ); temple and vertex polished, with sparse punctures ( Figs 2, 4 ).

Mesosoma. Length of mesosoma 1.6 × as long as its height (50: 31); notauli deep, sparsely crenulated, widened posteriorly, largely rugose ( Fig. 5 ); prescutellar sulcus wide, deep, 0.6 × as long as scutellum (4: 7), with one carina ( Fig. 5 ); scutellum convex, almost smooth; subalar depression almost smooth; pronotal side crenulated medially, smooth dorsally, ventrally with sinuate rugae ( Fig. 6 ); precoxal sulcus wide, sparsely crenulated; mesopleuron smooth; metapleuron and propodeum largely rugose; median lobe of mesoscutum finely sparsely punctate; lateral lobes almost smooth.

Wings. Length of fore wing 2.9 × its width (124: 43); length of pterostigma 3.0 × its width (30: 10), 1.5 × vein 1-R1 (30: 20) ( Fig. 11 ); vein r arising distinctly behind middle of pterostigma, 0.1 × as long as width of pterostigma (3: 30), and 0.15 × vein 1-R1 (3: 20); vein 1-CU1 short and thick, nearly quadrate ( Fig. 11 ); vein cu-a 0.3 × vein 2-CU1 (4: 12); length of hind wing 4.3 × its width (98: 23); 1-M: 1r-m: 2-SC+R = 2: 7: 6.

Legs. Length of hind femur, tibia and basitarsus 7.0, 17.3 and 11.0 × as long as their width, respectively; hind basitarsus 0.9 × hind tibia (49: 55); hind basitarsus 0.4 × hind tibia (22: 55), and 0.8 × second-fifth tarsus (22: 27); fourth hind tarsus 0.7 × fifth tarsus without pretarsus (4: 6).

Metasoma. Length of first tergite 2.45 × its apical width (27: 11), apical width of first tergite 2.75 × its minimum width (11: 4); ovipositor sheath 0.15 × fore wing (19: 124), and 0.7 × first tergite (19: 27); ovipositor flat, sinuate; first metasomal tergite smooth basally, longitudinally striate medially and apically ( Fig. 10 ), remaining tergites very smooth.

Colour. Head and mesosoma yellow; eyes silver-grey; legs and metasoma pale yellow, except first metasomal tergite and ovipositor sheath brown; wing veins yellow; wing membrane hyaline.

Male. Unknown.

Host: Unknown.

Etymology. From “inter” (Latin for between), because this species is intermediate between Streblocera quangbinhensis , sp. n. and S. tuyenquangensis , sp. n.

Variation. Paratypes, females, body length 3.3–3.5 mm, fore wing 2.7–2.9 mm, ovipositor sheath 0.4–0.5 mm.

Distribution. Vietnam: N Vietnam: Ninh Binh (Cuc Phuong); NC Vietnam: Ha Tinh (Huong Son), Quang Binh (Minh Hoa).

Figures

FIGURE 1. Streblocera (Eutanycerus) intermedia Long, sp. n. Holotype, female. 1 Habitus, lateral view

FIGURES 2–11. Streblocera (Eutanycerus) intermedia Long, sp. n. Holotype, female. 2 Head, dorsal view 3 Head, frontal view 4 Head, lateral view 5 Mesonotum 6 Mesopleuron 7 First-seventh flagellomeres, lateral view 8 Scapus 9 Propodeum 10 First metasomal tergite 11 Fore wing.