Colastomion nigroconfusum Long & Pham, 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 : 229-232

Colastomion nigroconfusum Long & Pham , sp. n.

Figs 56–67

Material examined. Holotype, ♀ ( IEBR), “Rog.1162”, S Vietnam: Dong Nai, Vinh Cuu, Phu Ly Commune , 11.3049°N 107.0605°E, light traps, 11.vi.2020, PT Nhi . Paratypes: 9 ♀ ( IEBR), “Rog.1160”, “Rog.1161”, “Rog.1163”, “Rog.1164”, “Rog.1165”, “Rog.1166”, “Rog.1167”, “Rog.1171”, “Rog.1172” ; 1 ♂ ( IEBR), “Rog.1168”, locality as holotype .

Morphology. Holotype, female, body length 9.4 mm, fore wing length 6.2 mm, antenna 7.5 mm ( Fig. 56 ).

Head. Antenna with 47 flagellomeres; middle antennomeres 2.3 × longer than wide (7: 3); 3 rd antennomere 1.3 × 4 th (12: 9); 3 rd segment of maxillary palp compressed laterally, 4.0 × longer than maximally wide (16: 4); 5 th segment 0.5 × length of 6 th (6: 11); face width as wide as length of face and clypeus combined (18: 18); width of face: height of eye = 1.8: 2.7; malar space 0.3 × as long as basal width of mandible (3: 9); basal width of mandible rugose, 0.7 × as long as hypoclypeal depression (9: 13); distance between tentorial pits 5.5 × distance between pit and eye (11: 2); in dorsal view, height of eye 3.0 × as long as temple (18: 6); in lateral view, width of eye 2.6 × as long as temple (18: 7) ( Fig. 58 ); ocelli large, in high triangle, POL: OD: OOL = 3: 6: 2; distance between front and hind ocelli 2.0 × as long as OOL (4: 2) ( Fig. 57 ); occipital carina complete, rather wavy when viewed laterally ( Fig. 58 ); face sparsely punctate, except area upper clypeus smooth, transversely rugulose laterally; frons flat, smooth, with sparse fine striae ( Fig. 57 ); vertex and temple smooth.

Mesosoma. Length of mesosoma 1.7 × as long as high (75: 45) ( Fig. 61 ); propleuron crenulate; precoxal sulcus rather deep, crenulate ( Fig. 61 ); mesopleuron sparsely finely punctate; subbalar space transversely rugose; metapleuron rugulose; mesoscutum finely rugo-punctate; notauli narrow and deep anteriorly, convergent posteriorly meeting deep median depression; scutellar sulcus 0.3 × as long as scutellum (5: 15) with five carinae; scutellum smooth; propodeum with strong raised median carina, which has strong lateral carinae transversely across its length ( Fig. 60 ), rugulose laterally.

Fore wing Pterostigma 5.0 × as long as wide (50: 10); vein M+CU1 straight; vein r arising far before middle of pterostigma; vein 1-SR+M strongly S-shaped ( Fig. 62 ); vein cu-a postfurcal, perpendicular ( Fig. 62 ); vein 2-CU1 10.25 × longer than 1-CU1; SR1: 3-SR: r = 50: 27: 10; vein 2-SR 3.0 × 2-SR+M (15: 5); 1-CU1: cu-a: 2-CU1: 3-CU1 = 4: 6: 41: 7; second submarginal cell large, basal length of second submarginal cell large, 3.2 × as long as its apical width (42: 13) ( Fig. 62 ).

Hind wing. Vein M+CU 1.3 × length of 1-M (40: 31); M+CU: 1-M: 1r-m = 40: 31: 13; vein 2-SC+R vertical ( Fig. 63 ); vein SR curving subbasally and gradually getting near to wing margin then parallel apically.

Legs. Hind coxa shiny smooth; femur: tibia: basitarsus: tarsus 1–5 = 66: 79: 50: 113; length of hind femur, tibia and basitarsus 6.6, 11.3 and 16.7 × 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; hind coxa shiny smooth.

Metasoma. First tergite strongly narrowed subbasally, 2.1 × as long as apical width (60: 29) ( Fig. 64 ); first metasomal tergite with complete midlongitudinal carina, rugo-striate laterally; 2 nd metasomal tergite with well developed midbasal triangular area giving rise to complete longitudinal carina ( Fig. 64 ), and 1.25 × its basal width, and 1.25 × 2 nd tergite (40: 32); 2 nd metasomal tergite 0.8 × wider than medially long (32: 40), with longitudinally striate with approximately 6 striae lateral to midlongitudinal carina; medial length of 3 rd tergite 0.8 × its basal width (32: 40); 3 rd tergite striate, with median carina on 0.5 basal tergite, becoming rugosity posteriorly; fourth-fifth tergites striate; sixth tergite sparsely punctate ( Fig. 64 ); hypopygium strongly convex ventrally, rather densely setose ( Fig. 59 ); ovipositor sheath glabrous basally, sparsely setose; ovipositor smooth apically, with three teeth apicoventrally.

Coloration. Body black or backish brown ( Fig. 56 ), except head yellow, mesonotum dorsally, propodeum medially, metasomal tergites 2+3 brown; palpi and antenna pale yellow, apical flagellomere dark brown; stemmaticum black; wing membrane and veins dark brown, except parastigma and fore wing vein 1-R1 whitish yellow; fore legs yellow, except trochanters and trochantellus creamwhite; middle and hind legs yellow, except coxa brown, trochanters and trochantellus creamwhite.

Variation (females). Antenna with 47–49 flagellomeres.

Male. (Paratype): Body length 7.8 mm, fore wing length 5.4 mm; antenna with 37 flagellomeres remaining; 3 rd segment of maxillary palp 1.7 × longer than maximally wide (20: 12) ( Fig. 65 ); 5 th segment 0.75 × length of 6 th (6: 8) ( Fig. 66 ); width of face: height of eye = 1.7: 2.6; fore wing vein 2-SR 3.75 × 2-SR+M (15: 4); hind wing vein 2-SC+R vertical ( Fig. 67 ); basal length of second submarginal cell 3.0 × as long as its apical width (36: 12).

Etymology. In reference to the highly patterned body, i.e. “niger” (Latin for black), and “confusio” (Latin for mixture), because of dark mixed body.

Remarks. Colastomion nigroconfusum , sp. n. is close to C. pukpuk Quicke, 2012 , from Papua New Guinea, but differs from the latter by the following chracters: 1) First metasomal tergite in lateral profile convex throughout midlength; 2) Notauli deeply impressed anteriorly and finely crenulated, merging posteriorly into a deep groove; 3) Precoxal sulcus rather deep and crenulate ( Fig. 61 ); 4) Hind vein M+CU 1.3 × as long as vein 1-M ( Fig. 63 ) (1.7 × in C. pukpuk ); and 5) Propodeum with strong raised median carina, which has strong lateral carinae transverly across its length ( Fig. 60 ) (in C. pukpuk median carina of propodeum mainly smooth, cf. Fig. 49 in Quicke et al., 2012).

This new species is also similar with C. chesmanae Quicke, 2012 , from Papua New Guinea, but can be distinguished from the latter by the following chracters: 1) Antenna with 47–49 flagellomeres (55 in C. pukpuk ); 2) Fore wing vein 2-CU1 10.25 × longer than 1-CU1 (8.5 × longer than 1-CU 1 in C. chesmanae ); 3) Hind wing vein M+CU 1.3 × as long as vein 1-M ( Fig. 63 ) (1.75 × in C. chesmanae ); and 4) Mesosoma black or blackish brown (yellow in C. chesmanae ).

Biology. Unknown

Distribution. S Vietnam (Dong Nai).

Figures

FIGURES 56–64. Colastomion nigroconfusum Long & Pham, sp. n., female, holotype. 56 Habitus 57 Head (dorsal view) 58 Head (lateral view) 59 Hypopygium (lateral view) 60 Propodeum 61 Mesopleuron 62 Fore wing 63 Hind wing 64 Metasoma.

FIGURES 65–67. Colastomion nigroconfusum Long & Pham, sp. n., male, paratype. 65 Head (lateral view) 66 Maxillary palp 67 Hind wing.

FIGURES 48–55. Colastomion neuterum Long, sp. n., male, paratype. 48 Habitus 49 Head (dorsal view) 50 Head (lateral view) 51 Propodeum 52 Maxillary palp 53 Fore wing 54 Hind wing 55 First-third metasomal tergites.