Chorebus (Phaenolexis) lobulus, Papp, 2013

Papp, J., 2013, Dacnusines From Korea: New And Known Species (Hymenoptera: Braconidae: Alysiinae: Dacnusini), Acta Zoologica Academiae Scientiarum Hungaricae 59 (3), pp. 229-265 : 243-245

Chorebus (Phaenolexis) lobulus sp. n.

(Figs 37–46)

Type material – Female holotype: Korea, Kangwon, Taebaek Cholam Idong, 22 Janu- ary 1991, leg. D.-S. Ku. Holotype is in good condition: (1) glued on card point by its mesosternum, (2) left flagellum distally deficient, i.e. with 21 antennomeres, (3) wings somewhat creased. Holotype is deposited in the Hungarian Natural History Museum, Budapest, Hym. Typ. No. 12124 .

Etymology – The species name ”lobulus” refers to the anguliform lobule of gena beyond mandible (Fig. 38).

Description of the female holotype – Body length 3.4 mm. Right antenna slightly longer than body and with 31 antennomeres. First flagellomere 2.6 times and penultimate flagellomere 1.5 times as long as broad. – Head in dorsal view transverse (Fig. 37), 1.65 times as broad as long, eye one-fourth (1.25 times) longer than temple, temple straight, i.e. not rounded, occiput less excavated. Ocelli small, elliptic, far from each other, OOL 2.3 times as long as POL. Eye in lateral view 1.7 times as high as wide and slightly less wide than gena (18:20) at lobule, lobule ventrally on gena close to mandible, angular in form and with short pubescence (Fig. 38, see arrows). Inner margin of eyes somewhat converging ventrally. Mandible (Fig. 39): upper (or first) tooth rounded, second tooth spiky, 3rd and 4th teeth small. Head polished; face hairpunctured, vertex with dispersed hairs.

Mesosoma in lateral view 1.6 times as long as high. Notaulix weakly distinct, shallow, smooth; pubescence of mesosoma abundant characteristic to species of Leptogaster-group. Mesoscutum hairy anteriorly, mesoscutal midpit long, longer than width of prescutellar furrow (Fig. 42). Precoxal suture linearform, curved, extended from fore to hind margins of mesopleuron, subcrenulated (Fig. 43). Rosette of metapleuron distinct. Propodeum and metapleuron densely rugulose. – Hind femur 3.5 times as long as broad and clearly broadening distally (Fig. 40). Hind tibia somewhat longer than hind tarsus. Hind basitarsus as long as tarsomeres 2–3 + 2/3rd of fourth tarsomere combined.

Fore wing as long as body. Pterostigma wide (Fig. 41), five times as long as wide, issuing r proximally from its middle and shorter than width of pterostigma (9:10); 2–SR 1.4 times as long as r, 1– R 1 0.8 times as long as pterostigma and approaching tip of wing; SR1 straight, 3–SR + SR1 as in Fig. 41. First subdiscal cell closed distally, veins relatively thin (Fig. 44, see arrow).

First tergite (Fig. 45) twice as long as broad behind, parallel-sided, relatively broad, pair of spiracles before middle of tergite, pair of basal keels not meeting; rugo-rugulose, baso-laterally striated, hairless. Tergites 2–3 one-fourth (40:50) shorter than first tergite, border between them indistinct. Tergites beyond first tergite polished. Hypopygium point- ed, ovipositor sheath as long as hind basitarsus (Fig. 46).

Scape, pedicel and flagellomeres 1–2(–3) brownish yellow, flagellum rather light brown. Head and mesosoma black with dark brown suffusion, first tergite blackish. Tergites 2–3 yellow, rest of tergites brown. Palpi pale yellow. Tegula and legs yellow. Wings hyaline, pterostigma and veins brown.

Male and host unknown.

Distribution: Korea.

Taxonomic position – The new species, Chorebus (Phaenolexis) lobulus , runs to Ch. (Ph.) petiolaris Tobias ( TobiAs 1998: 405) in Tobias’s key to the Far East Chorebus species of Asiatic Russia ( TobiAs 1998: 354–410; the species in question known by its description). Their common features are: gena ventrally and close to mandible with an angular lobule (Fig. 38), temple in dorsal view straight (Fig. 37), mesosoma 1.5–1.6 times as long as high, first tergite parallel-sided and legs more or less yellow; the two species are differentiated by the following features:

1 (2) Temple in dorsal view slightly longer than eye, angular lobule of gena with long pubescence. Hind femur five times as long as broad. Antenna with 40 antennomeres. Occiput pubescence. Mesoscutal midpit shorter than width of prescutellar furrow. First tergite hairy. Legs brownish yellow, hind tibia brownish fumous, tarsus brown. f: 3 mm. – Asiatic Russia (Primorski Krai) Chorebus (Phaenolexis) petiolaris Tobias, 1998

2 (1) Temple in dorsal view one-fourth (or 0.75 times) shorter than eye (Fig. 37), angular lobule of gena with short pubescence (Fig. 38). Hind femur 3.5 times as long as broad (Fig. 40). Antenna with 31 antennomeres. Occiput with disperse hairs. Mesoscutal midpit long, longer than width of prescutellar furrow (Fig. 42). First tergite bare. Legs yellow. f: 3.4 mm. – Korea Chorebus (Phaenolexis) lobulus sp. n.