Bracon (Bracon) virgatus Marshall, 1897

Samartsev, Konstantin & Ku, Deok-Seo, 2021, New records of Braconinae (Hymenoptera, Braconidae) from South Korea, Journal of Hymenoptera Research 83, pp. 21-72 : 21

Bracon (Bracon) virgatus Marshall, 1897

Figs 77-83 , A7

Material.

South Korea (9 females). - Gyeonggi-do • 1 female; Suwon-si, [37] Gwonseon-gu, Seodun-dong , Yeogisan Mountain ; 29 May - 6 Jul. 1994; D.-S. Ku leg.; Malaise trap; NIBR 942 • 1 female; same data as for preceding; 23-29 Jun. 1994; ZISP 939 • 1 female; same locality as in preceding; 10 Jul. 1995; June-Yeol Choi leg.; Malaise trap; SMNE 935 • 1 female; same data as for preceding; 7 Aug. 1995; SMNE 940 • 1 female; same data as for preceding; 3 Jun. 1996; SMNE 932 • 1 female; same data as for preceding; 30 Jun. 1997; SMNE 933 • 1 female; same locality as in preceding; 5 Aug. 1997; June-Yeol Choi leg.; SMNE 934 • 1 female; same data as for preceding; 25 Aug. 1997; June-Yeol Choi leg.; Malaise trap; ZISP 936 . - Gyeongsangbuk-do • 1 female ; Bonghwa-gun, [43] Myeongho-myeon ; 28 May 1993; D.-S. Ku leg.; SMNE 941 .

Additional material.

Netherlands • 1 female (holotype of Bracon lineifer van Achterberg, 1988); Waarder, Oosteinde, 33; 5-7 Aug. 1973; C. van Achterberg leg.; RMNH .

Distribution.

Europe: Eastern Europe: Hungary; Western Europe: Great Britain, the Netherlands, Switzerland. South Korea (new record).

Description.

Female. Fore wing length 2.9-3.3 mm. Width of head (dorsal view) 2.0-2.1 × its median length. Transverse diameter of eye (dorsal view) 2.3-2.5 × longer than temple. OOL 1.9-2.0 × Od; POL 0.95-1.10 × Od; OOL 1.8-2.0 × POL. Longitudinal diameter of eye (lateral view) 1.3 × larger than its transverse diameter; hind margins of eye and temple subparallel. Face width 1.4-1.5 × combined height of face and clypeus. Face width 2.3 × larger than width of hypoclypeal depression. Longitudinal diameter of eye 3.1-3.2 × longer than malar space (anterior view). Malar suture deep under eye, weak near mandible, smooth. Width of hypoclypeal depression 1.1-1.2 × larger than distance from depression to eye. Antenna about 0.9 × as long as fore wing, with 26-30 antennomeres. First, middle and penultimate flagellomeres 1.7-1.8 ×, 1.5-1.9 ×, and about 2.0 × longer than wide, respectively. Mesosoma 1.4-1.5 × longer than its maximum height. Mesoscutum evenly, but sparsely setose. Notauli very deep anteriorly, impressed and not united posteriorly. Mesepimeral and metapleural sulci smooth. Medio-longitudinal keel developed in apical half of propodeum, branching. Fore wing vein r arising from basal 0.45-0.50 of pterostigma; vein 1-R1 1.5-1.6 × longer than pterostigma; marginal cell 10-11 × longer than distance from its apex to apex of wing; vein 3-SR 2.0-2.4 × vein r, about 0.55 × vein SR1, 1.3-1.5 × vein 2-SR. Hind femur 3.5-4.1 × longer than wide. Hind tibia with without subapical row of thick setae. Fifth segment of hind tarsus 0.5-0.6 × as long as hind basitarsus, 0.9-1.0 × as long as second segment. Claws with long triangularly protruding acute basal lobe. First metasomal tergite with complete dorsal carina and developed dorsolateral carinae, its median length 0.76-0.82 × its apical width. Second metasomal tergite with weak, narrow, longitudinal median area and with deep s-shaped crenulate dorsolateral impressions bordered by long carinae; medially 1.2 × longer than third tergite; its basal width 1.6 × its median length. Apical margins of third to sixth tergites thick, without transverse subapical grooves. Ovipositor sheath 0.96-0.98 × as long as hind tibia, 0.25-0.27 × as long as fore wing. Apex of ovipositor with developed nodus and weak ventral serration. Head and mesosoma almost entirely smooth (only face and frons with vague granulate sculpture); apical two thirds of propodeum with tree-like rugosity; first metasomal tergite rugose posteriorly and laterally; second tergite areolate-rugose, third tergite areolate-rugose to foveate, fourth-fifth tergites irregularly foveate, sixth tergite smooth. Head and mesosoma dark brown with yellowish brown (or rusty) pattern, metasoma dorsally dark brown with yellow medio-longitudinal stripe and lateral and ventral sides; scape and tegula rusty; palps and legs yellow; wing membrane weakly darkened, pterostigma and wing veins brown.

Diagnosis.

Bracon virgatus Marshall is similar to B. imbricatellus Tobias; their differences are listed below. Both species may be also compared with the B. sculptithorax species group (see Samartsev and Ku 2020: 18), but differ by the absence of granulate sculpture on gena, vertex, mesopleuron, and mesoscutum.

1	Transverse diameter of eye in dorsal view 1.6-2.0 × temple (Fig. 27 ), in lateral view, 1.5-2.1 × minimum width of temple (Fig. 24 ). Mesosoma 1.7-1.8 × longer than its maximum height. Hind femur 3.0-3.4 × longer than wide. Anterolateral areas of second metasomal tergite weakly separated by having smoothed sculpture (Figs 25 , 26 , 28 ). Apical margins of third to sixth metasomal tergites with weakly foveate transverse subapical grooves (Fig. 26 ). Spiracle of second metasomal tergite located in middle of tergite (Fig. 28 ). Propodeal spiracle located in middle of propodeum (lateral view)	Bracon (Bracon) imbricatellus Tobias
-	Transverse diameter of eye in dorsal view 2.3-2.5 × temple (Fig. 79 ), in lateral view, 2.7-3.4 × minimum width of temple (Fig. 81 ). Mesosoma 1.4-1.5 × longer than its maximum height (Fig. 77 ). Hind femur 3.5-4.1 × longer than wide. Anterolateral areas of second metasomal tergite not separated (Figs 82 , 83 ). Apical margins of third to sixth metasomal tergites without transverse subapical grooves. Spiracle of second metasomal tergite located in anterior part of tergite (Fig. 82 ). Propodeal spiracle located behind middle of propodeum (lateral view)	Bracon (B.) virgatus Marshall

Remarks.

The type of B. virgatus was not examined for the current study. Our taxon concept of the species is based on the examination of the type of B. lineifer van Achterberg, 1988, which was synonymised with B. virgatus by Papp (1999), however, without due justification. The specimens from South Korea differ from the type of B. lineifer by weakly sculptured, almost smooth face and frons (Fig. 78 ).

Figures

Figures 68 - 83. Bracon (Bracon) tergalis Tobias, 2000 (68 - 76 holotype, female, ZISP) and B. (B.) virgatus Marshall, 1897 (77, 78, 80, 81 female, SMNE 79, 82, 83 female, ZISP) 68 habitus, dorsal view 69, 78 head, anterior view 70, 80 mesosoma, dorsal view 71 hind tarsus habitus, lateral view 72, 79 head, dorsal view 73, 82 metasoma, dorsal view 74, 83 head, lateral view 75 head, ventrolateral view 76, 83 first metasomal tergite, dorsal view. Scale bars: 0.5 mm (69 - 73, 78 - 83); 1 mm (68, 77).

Figures A 5 - A 8. Collecting localities of the material on the species new to South Korea. Point numbers correspond with numbers in brackets in text.

Figures 22 - 36. Bracon (Bracon) imbricatellus Tobias, 2000 (22 - 28 holotype, female, ZISP) and B. (B.) longigenis Tobias, 1957 (29, 31, 32, 35, 36 holotype 30, 34 paratype, female, ZISP) 22 habitus, dorsal view 23, 34 head, anterior view 24, 29 head, lateral view 25, 35 first metasomal tergite, dorsal view 26 metasoma, dorsolateral view 27, 33 head (and mesoscutum), dorsal view 28 metasoma, dorsal view 30 head, ventrolateral view 31 habitus, lateral view 32 apex of ovipositor 36 metasoma and hind tarsus, dorsal view. Scale bars: 0.25 mm (32); 0.5 mm (23 - 30, 34 - 36); 1 mm (31).