Colastomion citrum 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 : 224-226

Colastomion citrum Long , sp. n.

Figs 27–36

Material examined. Holotype, ♂ ( IEBR), “ Rog.691 ”, NC Vietnam: Ha Tinh, Vu Quang NP, forest, 06.x.2009, KDLong.

Morphology. Holotype, ♂, body length 4.0 mm, fore wing length 2.8 mm, antenna 4.0 mm ( Fig. 27 ).

Head. Antenna with 32 flagellomeres remaining; terminal flagellomere acuminate; middle flagellomere 3.0 × longer than wide (6: 2); 3 rd antennomere 1.2 × fourth (7: 6); 3 rd segment of maxillary palp 2.0 × longer than maximally wide (12: 6); 5 th segment 0.8 × length of 6 th (4: 5); width of face as long as face length and clypeus combined (12: 12); width of face: height of eye = 1.2: 1.5; malar space 0.6 × as long as basal width of mandible (3: 5); basal width of mandible 0.7 × as long as hypoclypeal depression (5: 7); distance between tentorial pits 2.0 × distance between pit and eye (8: 2); in dorsal view, height of eye 3.0 × as long as temple (12: 4); in lateral view; width of eye 3.0 × as long as temple (12: 4); occipital carina slightly wavy ( Fig. 35 ); ocelli large, POL: OD: OOL = 3: 4: 3; distance between front and hind ocelli as long as OOL (2: 3) ( Fig. 29 ); occipital carina narrowly obliterated mediodorsally ( Fig. 29 ); between posterior ocellus with distinct groove; vertex and temple smooth; face narrowly smooth medially, transversely rugulose laterally ( Fig. 28 ); frons smooth with divergent striae laterally ( Fig. 29 ).

Mesosoma. Length of mesosoma 1.6 × as long as high (46: 28); propleuron largely smooth, sparsely crenulate anteriorly; precoxal sulcus wide, smooth posteriorly, punctate anteriorly; mesopleuron and metapleuron smooth; mesoscutum largely smooth with a deep smooth medial depression posteriorly between notauli; notauli narrow and deep anteriorly, deeply depressed posteriorly ( Fig. 30 ); scutellar sulcus deep, 2.7 × as long as scutellum (8: 3) with one medial carina; scutellum smooth; propodeum widely depressed medially, almost smooth ( Fig. 31 ).

Fore wing. Pterostigma 5.4 × as long as wide (27: 5); vein r arising before middle of pterostigma; vein M+CU1 straight; vein 1-SR+M slightly curved apically; vein cu-a postfurcal, nearly perpendicular ( Fig. 33 ); 2-CU1 8.5 × longer than 1-CU1 (17: 2); SR1: 3-SR: r = 26: 16: 4; vein 2-SR 2.25 × 2-SR+M (9: 4); 1-CU1: cu-a: 2-CU1: 3-CU1= 2:3:17:4; basal length of second submarginal cell 2.9 × as long as its apical width (20: 7).

Hind wing. Vein M+CU 1.1 × length of vein 1-M; vein M+CU: 1-M: 1r-m = 14: 15: 6; vein 2-SC+ R thickened, subquadrate; vein SR curving subbasally and getting closer to anterior margin towards wing tip ( Fig. 34 ).

Legs. Hind coxa smooth dorsally; length of hind femur: tibia: basitarsus: tarsus 1–5 = 35: 41: 23: 54; length of hind femur, tibia and basitarsus 5.0, 8.2 and 11.5 × as long as their width respectively.

Metasoma. First tergite 1.6 × as long as apical width (24: 15) ( Fig. 32 ) posteriorly wide; first tergite with interrupted carina, surface rugo-punctate medially, sparsely striate laterally; 2 nd metasomal tergite 1.3 × wider than medially long (23: 18), with wide midbasal triangular area giving rise to short midlongitudinal carina, rather sparsely irregularly longitudinally striate; medial length of 2 nd tergite 1.2 × than third (17: 14); median length of 3 rd metasomal tergite 0.6 × its basal width (14: 25) ( Fig. 32 ); 3 rd metasomal tergite 1.2 × wider than long; longitudinally striate; fourth-fifth tergites coriaceous basally, smooth apically; sixth tergite smooth.

Coloration. Head yellow; stemmaticum blackish brown; antenna creamwhite basally, brownish yellow apically; palpi creamwhite; propleuron yellow; mesopleuron yellow anteriorly, whitish yellow posteriorly; fore leg whitish yellow, except coxa creamwhite; middle legs whitish yellow, except coxa yellow; hind leg whitish yellow, except yellow medio-apically; wings hyaline with yellow veins; first metasomal tergite yellow; second-sixth tergites mainly pale yellow, brownish yellow laterally ( Fig. 32 ).

Female: Unknown.

Etymology. From “citer” (Latin for lying near, near, close), because hind wing vein SR curving basally and getting closer to anterior margin towards wing tip.

Biology. Unknown.

Distribution. NC Vietnam (Ha Tinh).

Figures

FIGURES 27–36. Colastomion citrum Long, sp. n., male, holotype. 27 Habitus 28 Head (frontal view) 29 Head (dorsal view) 30 Mesonotum (dorsal view) 31 Propodeum 32 First-fourth metasomal tergites 33 Fore wing 34 Hind wing 35 Head (lateral view) 36 Mesopleuron.