Bracon (Osculobracon) perspicillatus, Samartsev & Ku, 2020

Samartsev, Konstantin & Ku, Deok-Seo, 2020, New species of the genera Bracon Fabricius and Syntomernus Enderlein (Hymenoptera, Braconidae, Braconinae) from South Korea, ZooKeys 999, pp. 1-47 : 1

Bracon (Osculobracon) perspicillatus sp. nov. Figs 99-106 , 107-114

Type material.

Holotype. South Korea - Gangwon-do • female; Goseong-gun, [5] Ganseong-eup, Jinbu-ri; 12 Jun. 1992; D.-S. Ku leg.; 306; NIBR.

Paratypes. 2 females, 4 males. South Korea - Gangwon-do • 1 male; same data as for holotype; 307; ZISP • 1 male; same data as for holotype; 308; SMNE • 1 female; Goseong-gun, [4] Geojin-eup, Naengcheon-ri, Geonbongsa Temple; 25 May 1993; D.-S. Ku leg.; 278; SMNE • 2 males; same data as for preceding; 313, 314; SMNE • 1 female; same data as for preceding; 304; ZISP.

Etymology.

The name perspicillatus (from Latin perspicillum for spectacles) refers to a pair of light patches on the face below toruli which characterise the species.

Description.

Female. Body length 2.3-3.4 mm; fore wing length 2.6-3.7 mm.

Head. Width of head (dorsal view) 1.8-1.9 × its median length. Transverse diameter of eye (dorsal view) 1.7-1.8 × longer than temple. Eyes with sparse, short setae. OOL 2.4-3.0 × Od; POL 1.3-1.9 × Od; OOL 1.5-1.8 × POL. Frons with deep mid-longitudinal groove. Longitudinal diameter of eye in lateral view 1.4-1.5 × larger than its transverse diameter. Transverse diameter of eye (lateral view) 1.8-2.4 × longer than minimum width of temple, hind margins of eye and temple broadened downwards. Face width 1.4-1.5 × combined height of face and clypeus; 2.3-2.6 × larger than width of hypoclypeal depression. Longitudinal diameter of eye 2.4-2.8 × longer than malar space (front view); malar space 0.87-0.92 × base of mandible. Malar suture deep and smooth. Width of hypoclypeal depression 1.0-1.3 × larger than distance from depression to eye. Clypeus not separated from face by dorsal carina, flattened, with not protruding ventral rim, height of clypeus 0.30-0.35 × width of hypoclypeal depression; clypeal sulcus smoothened. Maxillary palp longer than eye, but shorter than head.

Antenna ca. 1.2 × longer than fore wing, with 32-40 antennomeres. First flagellomere 2.0-2.2 × longer than its apical width, 1.0-1.1 × longer than second flagellomere. Middle and penultimate flagellomeres 1.6-2.0 × and 1.8-2.2 × longer than wide, respectively. Apical flagellomere spiculate.

Mesosoma ca. 1.6 × longer than its maximum height. Transverse pronotal sulcus smoothened. Notauli smooth, impressed anteriorly, smoothened and not united posteriorly. Mesoscutum setose only on notauli. Scutellar, mesepimeral and metapleural sulci smooth, mesopleural pit indistinct. Median area of metanotum with incomplete median carina. Mid-longitudinal keel on propodeum absent.

Wings. Fore wing 1.0-1.1 × longer than body. Pterostigma 3.2-3.7 × longer than wide. Vein r arising from basal 0.40-0.45 of pterostigma length. Vein 1-R1 1.3-1.6 × longer than pterostigma. Marginal cell 7.5-9.7 × longer than distance from its apex to apex of wing. Vein 3-SR 2.3-2.7 × longer than vein r, 0.60-0.65 × as long as vein SR1, 1.5-1.7 × longer than vein 2-SR. Vein 1-M 0.75-0.85 × vein 1-SR+M, 1.5-1.7 × vein m-cu. 2.1-2.2 × longer than vein cu-a. Vein 2-SR+M 0.16-0.22 × as long as vein 2-SR, 0.23-0.38 × as long as vein m-cu. Vein 1-CU1 (posterior margin of discal cell) 2.3-2.8 × longer than vein cu-a. Vein cu-a interstitial. Vein 2-1A of hind wing absent or very short; vein r-m strongly antefurcal.

Legs. Fore tibia with sparse longitudinal and dense transverse apical rows of thick setae. Hind femur 3.8-3.9 × longer than wide. Hind tibia 1.5-1.7 × longer than hind femur, without subapical row of thick setae, its inner spur 0.23-0.30 × as long as hind basitarsus. Hind tarsus 0.95-1.00 × as long as hind tibia. Fifth segment (without pretarsus) of hind tarsus 0.45-0.50 × as long as hind basitarsus and 0.80-0.85 × as long as second segment. Claws with large, protruding and blunt basal lobes.

Metasoma 1.2-1.4 × longer than mesosoma. Median length of first tergite (measured from petiolar tubercle) 1.3-1.5 × larger than its apical width. Dorsolateral and dorsal carinae of first metasomal tergite absent. Median area of first tergite separated by smooth furrow, 0.6-0.7 × apical width of tergite. Second tergite sclerotised in anterior 0.85-0.95, medially 0.9-1.0 × as long as third tergite and 0.85-1.05 × as large as apical width of first tergite. Basal width of second metasomal tergite 1.8-1.9 × larger than its median length. Anterolateral margin of second metasomal tergite shortly de-sclerotised. Suture between second and third tergites thin, shallow, weakly curved and smooth. Apical margins of third to sixth tergites largely de-sclerotised. Ovipositor sheath 0.50-0.75 × as long as hind tibia and 0.16-0.21 × as long as fore wing. Apex of ovipositor with weak nodus and weak or absent ventral serration.

Sculpture. Body completely smooth.

Colour. Body brownish black or brown. Head with more or less developed brownish yellow patches near eyes (on face, vertex and in lower part of gena), below toruli and on oral parts. Maxillary palps yellow. Tegulae, legs and de-sclerotised parts of metasoma yellow to brownish yellow or yellowish brown. Wing membrane weakly darkened, basally yellowish; pterostigma and wing veins brown or yellowish brown.

Male. Body length 2.1-2.6 mm; fore wing length 2.5-2.7 mm. Width of head (dorsal view) 1.6-1.8 × its median length. Transverse diameter of eye (dorsal view) 1.8-2.2 × longer than temple. Hind margins of eye and temple less broadened downwards (subparallel). Mesosoma 1.5-1.8 × longer than its maximum height. Fore wing vein 3-SR 2.7-2.9 × longer than vein r, 0.61-0.74 × as long as vein SR1, 1.6-1.9 × longer than vein 2-SR. Second tergite sclerotised in anterior 0.75-0.90, its basal width 1.2-1.8 × larger than median length. Otherwise similar to female.

Diagnosis.

The new species is most similar to Bracon cingulator Szépligeti, B. koreanus Papp, and B. osculator Nees, which also have the entirely smooth body and not shortened marginal cell of the fore wing. The differences between these species are listed in the key below (the characters for B. cingulator and B. osculator are given on the basis of an unpublished dataset).

Figures

Figures 99 - 106. Bracon (Osculobracon) perspicillatus sp. nov. (holotype, NIBR) 99 habitus, lateral view 100 head, front view 101 head, dorsal view 102 head and mesosoma, lateral view 103 hind leg 104 head, ventrolateral view 105 apex of hind tarsus 106 fore tibia. Scale bars: 1 mm (99, 102); 0.5 mm (100, 101, 103, 104); 0.25 mm (105, 106).

Figures 107 - 114. Bracon (Osculobracon) perspicillatus sp. nov. (107 - 111 holotype, NIBR, 112 - 114 male paratype, SMNE) 107 wings 108 mesosoma, dorsal view 109 propodeum and first metasomal tergite, dorsal view 110 metasoma, dorsal view 111 apex of ovipositor 112 habitus, lateral view 113 first metasomal tergite, dorsal view 114 second and third metasomal tergites, dorsal view. Scale bars: 1 mm (107, 112); 0.5 mm (108 - 110); 0.25 mm (111, 113, 114).

Figures 115 - 126. Bracon (Osculobracon) koreanus Papp, 1998 (115, 118, 121, 124 holotype, HNHM), B. (O.) cingulator Szepligeti, 1901 (116, 119, 122, 125 holotype, HNHM) and B. (O.) osculator Nees, 1811 (117, 120, 123, 126 lectotype of B. coniferarum Fahringer, 1928, MNB) 115 - 117 head, front view 118 - 120 head, lateral view 121 - 123 first metasomal tergite 124 - 126 second and third metasomal tergites, dorsal view. Scale bars: 0.25 mm.