Blacus (Leioblacus) pentagonus, Papp, 2018

Papp, Jenő, 2018, Braconidae (Hymenoptera) From Korea, Xxiv. Species Of Thirteen Subfamilies, Acta Zoologica Academiae Scientiarum Hungaricae 64 (1), pp. 21-50 : 38-40

Blacus (Leioblacus) pentagonus sp. n. ( Figs 77–83 )

Material examined – Female holotype: Korea, prov. Kangwon , Do Wonju, Mt. Chiak, taken with mercury vaour lamp at night, 3–4 August 1995, leg. D–S. Ku. Holotype is in good condition: (1) glued on card point by its mesosternum, (2) right middle tarsus hardly visible owing to the mounting.

Type depository – Holotype is deposited in the Hungarian Natural History Museum ( Department of Zoology ), Budapest, Hym. Typ. No. 12274.

Etymology – The new species received the name ”pentagonus” after the form of the propodeal areolae ( Fig. 79 ).

Description of the female holotype – Body 1.8 mm long, fore wing 1.9 mm long. Antenna as long as fore wing and with 19 antennomeres. First flagellomere 3.6 times as long as broad apically, second flagellomere distinctly shorter than first flagellomere: 2.4 times as long as broad, i.e., first flagellomere 1.5 times longer than second flagellomere ( Fig. 77 ). Flagellomere 3–18 gradually shortening so that penultimate flagellomere 1.8 times as long as broad; ultimate flagellomere four times as long as broad and pointed apically.

Head in dorsal view of usual ”Blacus-form”: cubic, 1.5 times as broad as long, temple 1.2 times longer than eye, rounded, gena and occiput margined ( Fig. 78 ). Eye in lateral view 1.6 times as high as wide, gena as wide as eye. Clypeus three times as wide as high, distance between tentorial pits twice longer than that between pit and eye.

Mesosoma in lateral view 1.3 times as long as high. Pronotum laterally striolaterugose, medially rugose. Notauli evenly deep, narrow, subcrenulate (or almost smooth), meeting and shortly continuing. Mesoscutal lobes glabrous and polished. Scutellum also polished and margined. Propodeum with four, pentagonal areolae, areola basalis short, pair of lateral tubercules missing, laterally from areolae propodeum rugulose ( Fig. 79 ). Precoxal sulcus wide and faintly crenulate, otherwise mesopleuron polished ( Fig. 80 ). – Hind femur thin, 5.5 times as long as broad apically, weakly thickening distally ( Fig. 81 ). Fore femur five times as long as broad. Claws without long blackish bristles.

Fore wing slightly longer than body (1.9 mm). Pterostigma 3.6 times as long as wide, width of pterostigma equal to length of r (10:10), 3–SR (+ SR1) almost straight (or faintly arched) and reaching tip of wing. Parastigma distinct, first discal cell acute anteriorly ( Fig. 82 see arrow). Subdiscal (or brachial) cell nearly missing.

Metasoma about as long as mesosoma. First tergite 1.6 times as long as broad and gradually broadening posteriorly, pair of basal keels almost reaching hind end of tergite, tergite with rather longitudinal rugulosity; second tergite quadrate in form: slightly longer than broad behind (35:30, Fig. 83 ), together with further tergites polished. Ovipositor sheath somewhat shorter than hind tibia (32:38).

Ground colour of body brown. Scape, pedicel and flagellomeres 1–2(–3) yellow, rest of flagellomeres brownish. Face and pronotum light brownish. Tegula and legs yellow, fifth tarsomeres darkening. Wings hyaline, pterostigma yellow, veins proximo-distally pale yellow to yellow.

Male and host unknown.

Taxonomic position – The blacine new species, Blacus (Leioblacus) pentagonus sp. n., is close to Blacus (Leioblacus) fischeri Haeselbarth : it runs to this species with HAESELBARTH’ s (1973) as well as with VAN ACHTERBERG’ s (1988) and BELOKOBYLSKIJ’ s (2000) keys to the Palaearctic species of Blacus . The two species are distinguished by the features as follows:

1 (2) Areolation of propodeum as in Fig. 46. First tergite 2–2.3 times as long as broad posteriorly, parallel-sided; second tergite 1.5–1.6 times longer than broad posteriorly ( Fig. 84 ). Fore wing: pterostigma somewhat less wide than length of r, r issuing clearly distally from its middle (Fig. 47 see arrows). Head in dorsal view slightly more cubic, 1.4 times as broad as long, temple 1.3 times longer than eye ( Fig. 85 ). Antenna with 17–18 antenomeres; first flagellomere slightly longer than second flagellomere (11:10, Fig. 86 ). f: 2.3 mm. – Germany, Nederland, Austria, Romania, Slovenia, Asiatic Russia: Primorski krai Blacus (Leioblacus) fischeri Haeselbarth, 1973

2 (1) Areolation of propodeum as in Fig. 79 . First tergite 1.6 times as long as broad and broadening posteriorly; second tergite slightly longer than broad posteriorly (35:30, Fig. 83 ). Fore wing: pterostigma somewhat wider than length of r (10:9), r issuing slightly distally from its middle ( Fig. 82 see arrows). Head in dorsal view slightly less cubic, 1.5 times as broad as long, temple 1.2 times longer than eye ( Fig. 85 ). Antenna with 19 antennomeres; first flagellomere long, 1.5 times longer than second flagellomere ( Fig. 77 ). f: 1.8 mm. – Korea Blacus (Leioblacus) pentagonus sp. n.

Figures

Figs 75–88. 75–76. Chelonus formosanus Sonan (f): 75 = carapace in lateral view, 76 = carapace in dorsal view. – 77–83. Blacus (Leioblacus) pentagonus sp. n. (f holotype): 77 = flagellomeres 1–2, 78 = head in dorsal view, 79 = propodeum, 80 = mesopleuron with precoxal sulcus, 81 = hind femur, 82 = distal part of right fore wing, 83 = tergites 1–2. – 84–86.Blacus (Leioblacus) fischeri Haeselbarth (f): 84 = tergites 1–2, 85 = head in dorsal view, 86 = flagellomeres 1–2. – 87–88.Microchelonus koreanus Tobias 87 (f) – 88 (m) = carapace in dorsal view