Colastomion vietnamense Long, 2021

Oanh, Nguyen Thi, Dzuong, Nguyen Van, Long, Khuat Dang, Lam, Pham Van, Nhi, Pham Thi & Hoa, Dang Thi, 2021, Six new braconid wasps of the genus Colastomion Baker, 1917 (Hymenoptera: Braconidae: Rogadinae) from Vietnam, Zootaxa 5040 (2), pp. 215-237 : 232-236

Colastomion vietnamense Long , sp. n.

Figs 68–83

Material examined. Holotype, ♀ ( IEBR), “Rog. 483 ”, NE Vietnam: Ha Giang, Vi Xuyen, Ngoc Duong , forest path, 22° 40’ 58.16” N 104° 58’ 59.736” E, sweep, 18.x.2006, KD Long . Paratypes: 6 ♀ ( IEBR), “Rog. 200 ”, N Vietnam: Ninh Binh, Cuc Phuong NP, forest, 20°20’N 105°35’E, 200m, sweep, 20–30.vi.2002, KD Long; “Rog. 235 ”, ibid. but 10–20.ix.2002, KD Long; “Rog. 482 ”, NE Vietnam: Ha Giang, Vi Xuyen, Dao Duc, forest path, 22.7280° N 104.9739° E, sweep, 20.x.2006, KD Long; “Rog. 1025 ”, NE Vietnam: Tuyen Quang, Na Hang, Thanh Tuong, forest, MT, 22°19’N 105°24’E, 162m, 10.vii.2017, KD Long; “Rog. 1085 ”, “Rog. 1086 ”, NE Vietnam: Tuyen Quang, Na Hang, Son Phu, forest, MT, 22°17’32’’N 105°28’19’’E, 570m, 15.viii.2018, KD Long ;; Paratypes: 8 ♂ ( IEBR), “Rog. 070 ”, NC Vietnam: Ha Tinh, Huong Son , forest, MT, 18° 22’ N 106° 13’ E, 300–400 m, 13–19.iv.1998, AMNH, KLong; “Rog. 198 ”, “Rog. 203 ”, N Vietnam: Ninh Binh, Cuc Phuong NP, forest, MT, 20°23’N 105°34’E, 315m, 1–10.vii.2002, KD Long; “Rog. 274 ”, ibid., but 10–20.ix.2002, KD Long; “Rog. 364 ”, “Rog. 365 ”, NW Vietnam: Lai Chau, Tam Duong, Lai Nhi Thang, forest, 22.3317° N 103.6189° E, 09.x.2005, KD Long; “Rog. 597 ”, NE Vietnam: Ha Giang, Quang Binh, Yen Thanh, 22.4203° N 104.5306° E, sweep, 25.x.2008, KD Long; “Rog. 661 ”, NW Vietnam: Phu Tho, Tan Son, Xuan Dai, fruit orchard, MT, 21°07’N 105°00’E, 120m, 1–5.vii.2009, KD Long .

Morphology. Holotype, ♀, body length 7.8 mm, fore wing length 6.2 mm, antenna 9.1 mm ( Fig. 68 ).

Head. Antenna with 52 flagellomeres; middle antennomeres 2.7 × longer than wide (8: 3); 3 rd antennomere 1.1 × fourth (10: 9); 3 rd segment of maxillary palp 4.0 × longer than maximally wide (12: 3); 5 th segment as long as 6 th; width of face 1.2 × length of face and clypeus combined (20: 17); width of face: height of eye = 2.0: 2.7; malar space 1.6 × as long as basal width of mandible (8: 5); basal width of mandible 0.5 × as long as hypoclypeal depression (8: 15); distance between tentorial pits 3.7 × distance between pit and eye (11: 3) ( Fig. 69 ); in dorsal view, height of eye 2.85× as long as temple (20: 7); in lateral view, width of eye 2.0 × as long as temple (16: 8) ( Fig. 74 ); ocelli large, POL: OD: OOL = 3: 6: 3; distance between front and hind ocelli as long as OOL (3: 3) ( Fig. 70 ); occipital carina narrowly obliterated medio-dorsally; face rugulose ( Fig. 69 ); frons flat, coriaceous medially, with sparse convergent striae laterally ( Fig. 70 ); vertex and temple almost smooth.

Mesosoma. Length of mesosoma 1.5 × as long as high (60: 41); precoxal sulcus smooth, sparsely crenulate anteriorly; precoxal sulcus short, coriaceous; mesopleuron smooth; metapleuron rugo-punctate; mesoscutum coriaceous with a smooth medial depression posteriorly between notauli ( Fig. 75 ); notauli narrow and deep anteriorly, flat posteriorly; scutellar sulcus 0.4 × as long as scutellum (6: 14) with one carina; scutellum smooth; propodeum short with basal carina, coriaceous laterally, with narrow median depression, which crenulate posteriorly ( Fig. 72 ).

Fore wing. Pterostigma 4.75 × as long as wide (57: 12); vein M+CU1 distinctly weakly curved subapically; vein cu-a postfurcal; vein r arising far before middle of pterostigma; vein cu-a reclivious ( Fig. 76 ), 2-CU1 6.0 × longer than 1-CU1; SR1: 3-SR: r = 49: 37: 12; vein 2-SR 4.5 × 2-SR+M (18: 4); 1-CU1: cu-a: 2-CU1: 3-CU1 = 6: 8: 36: 7; basal length of second submarginal cell 3.5 × as long as its apical width (49: 14).

Hind wing: Vein M+CU 1.15 × length of 1-M (31: 27); M+CU: 1-M: 1r-m = 31: 27: 16; vein 2-SC+ R quadrate ( Fig. 77 ); vein SR almost straight throughout.

Legs. Hind coxa shiny smooth; femur: tibia: basitarsus: tarsus 1–5 = 60: 76: 45: 102; length of hind femur, tibia and basitarsus 6.0, 10.85 and 15.0 × as long as their width respectively; middle tibial spur curved and outer side setose basally; apex of hind tibia with comb of specialized setae at inner side.

Metasoma. First tergite 1.8 × apical width (51: 29); first tergite with midlongitudinal carina on basal 0.85 (35: 41) of tergite, rugo-striate ( Fig. 73 ); 2 nd metasomal tergite with small midbasal triangular area giving rise to sinuate longitudinal carina ( Fig. 73 ); 2 nd tergite 1.3 × its basal width (38: 30), midlongitudinal carina on basal 0.8 (30: 38) of tergite, and 1.3 × 3 rd tergite (38: 29); 2 nd metasomal tergite 0.8 × wider than medially long (30: 38), with longitudinally striate with approximately 7 striae lateral to midlongitudinal carina; 3 rd metasomal tergite 0.7 × its basal width (29: 41), rugo-striate, rugo-punctate extremely apically ( Fig. 73 ); fourth tergite finely rugo-striate basally, sparsely punctate apically; fifth-sixth tergites sparsely punctate; hypopygium evenly convex with sparse setae ( Fig. 71 ); ovipositor sheath obiquely setose; ovipositor smooth apically, with three ventral teeth subapically distal to apex ( Fig. 71 ).

Coloration. Body yellow; antenna and palpi pale yellow; stemmaticum black; pterostigma brownish yellow medially, pale yellow basally and apically; wing membrane hyaline, smoky yellow apically and surrounding wing veins ( Fig. 76 ).

Male. (Paratype): Antenna with 47–49 antennomeres; body length 5.3–6.5 mm; fore wing 4.6–5.1 mm; 3 rd segment of maxillary palp 1.5 × longer than maximally wide (12: 8); 5 th segment 0.9 × length of 6 th ( Fig. 83 ); width of face: height of eye = 1.6: 2.4; fore wing vein 2-SR 4.7 × 2-SR+M ( Fig. 78 ); second submarginal cell elongate, basal length 3.5 × as long as its apical width ( Fig. 78 ); hind wing vein 2-SC+ R quadrate or subquadrate ( Fig. 79 ); second-third metasomal tergites sparsely striate ( Figs 80, 81 ).

Etymology. The new species is named after the country ( Vietnam), where the holotype was discovered.

Biology. Unknown.

Distribution. N Vietnam (Ninh Binh); NE Vietnam (Ha Giang, Tuyen Quang); NW Vietnam (Lai Chau, Phu Tho); NC Vietnam (Ha Tinh).

Figures

FIGURES 68–77. Colastomion vietnamense Long, sp. n., female, holotype. 68 Habitus 69 Head (frontal view) 70 Head (dorsal view) 71 Hypopygium (lateral view) 72 Propodeum 73 First-third metasomal tergites 74 Head (lateral view) 75 Mesonotum (dorsal view) 76 Fore wing 77 Hind wing.

FIGURES 78–83. Colastomion vietnamense Long, sp. n., male, paratype. 78 Fore wing 79 Hind wing 80 Second-fifth metasomal tergites 81 First-second metasomal tergites 82 Head (lateral view) 83 Maxillary palp.