Bracon (Lucobracon) brevicarinatus, Li & He & Chen, 2020

Li, Yang, He, Jun-hua & Chen, Xue-xin, 2020, The subgenera Glabrobracon Fahringer, Lucobracon Fahringer and Uncobracon Papp of the genus Bracon Fabricius (Hymenoptera, Braconidae, Braconinae) in China, with the description of eleven new species, Deutsche Entomologische Zeitschrift 67 (2), pp. 209-252 : 209

Bracon (Lucobracon) brevicarinatus sp. nov. Figs 13 , 14

Type material.

Holotype. ♀, China, Liaoniang Prov., Shenyang, 26.VIII.1994, Lou Juxian, No. 975731 ( ZJUH). Paratypes. 1♀3♂♂, China, Liaoniang Prov., Shenyang, VI-VII.1995, Lou Juxian, No. 975749, 975601, 975756, 975773 ( ZJUH).

Diagnosis.

This new species is very similar to B. (L.) flavitestaceus sp. nov., but can be separated from the latter by the following characters: ovipositor sheath 0.7 × as long as fore wing (0.1 × in B. (L.) flavitestaceus ); mesoscutum yellowish-brown, middle lobe anteriorly and lateral lobes with a blackish-brown spots, respectively (without spots); medio-longitudinal carina short, remaining far from middle of propodeum (long and beyond middle of propodeum); in dorsal view, length of eye 1.7-1.8 × temple (1.4-1.5 times).

Description.

Holotype, ♀, length of body 3.9 mm, of fore wing 3.5 mm, of ovipositor sheath 2.6 mm.

Head. Antenna with 29 segments; apical antennal segment acute, twice longer than its maximum width (Fig. 14l ); first flagellomere 1.9 × longer than wide, 1.1 and 1.2 × longer than second and third, respectively, the latter being 1.4 × longer than wide; malar suture rather weak, with dense short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 4: 10: 5; clypeus sparsely short setose; eye not emarginated (Fig. 14g ); face weakly granulate and with dense short setae laterally (Fig. 14g ); eye height: shortest distance between eyes: head width = 13: 18: 33; frons smooth slightly concave behind antennal sockets, with a rather weak median groove (Fig. 14h ); vertex smooth, with sparse short setae; shortest distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: shortest distance between posterior ocellus and eye = 3: 2: 5; temples linearly narrowed behind eyes (Fig. 14h ).

Mesosoma. Length of mesosoma 1.7 × its height (Fig. 14c ); notauli impressed anteriorly, rather shallow posteriorly (Fig. 14d ); mesoscutum smooth, with dense long setae along notaulic courses (Fig. 14d ); scutellar sulcus deep, moderately wide, with crenulae (Fig. 14d ); scutellum smooth, with dense setae posteriorly; metanotum moderately convex medially (Fig. 14d ); propodeum largely smooth, with a short medio-longitudinal carina posteriorly and sparsely setose medially, with dense long setae laterally (Fig. 14j ).

Wings. Fore wing (Fig. 14a ): SR1 not reaching tip of wing; SR1: 3-SR: r = 25: 15: 7; 1-SR+M straight, 1.6 × longer than 1-M; 2-SR: 3-SR: r-m = 12: 15: 8; m-cu straight, 1.2 × longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a more or less interstitial. Hind wing (Fig. 14b ): SC+R1: 2-SC+R: 1r-m = 13: 5: 6.

Legs. Length of fore femur: tibia: tarsus = 20: 24: 29; length of hind femur: tibia: basitarsus = 25: 37: 14; length of femur, tibia and basitarsus of hind leg 3.1, 9.3 and 5.6 × their maximum width, respectively; hind tibial spurs 0.3 and 0.4 × as long as hind basitarsus.

Metasoma. First tergite as long as its apical width; first tergite concave medio-basally, median area convex and largely smooth but weakly rugose laterally (Fig. 14k ); lateral grooves of first tergite moderately wide, with sparse crenulae (Fig. 14k ); second tergite largely smooth but medio-anteriorly rugose (Fig. 14e ); median length of second tergite slightly longer than that of third tergite; second metasomal suture moderately narrow, crenulate, more or less straight medially (Fig. 14e ); third to seventh tergites smooth (Fig. 14e ); ovipositor sheath 0.7 × as long as fore wing.

Colour. Largely yellowish-brown (Fig. 13 ); antenna, eyes, mandible apically, frons medially, stemmaticum, middle lobe of mesoscutum posteriorly, notaulic courses, mesopleuron posteriorly, scutellum posteriorly and laterally, metanotum, propodeum, claws and ovipositor sheath blackish-brown (Figs 13 , 14c, d, f-h, j ); median area of first metasomal tergite, second tergite medio-anteriorly and third to fourth tergites posteriorly infuscate (Fig. 14e, k ); wing membrane pale yellow, pterostigma dark brown and veins yellowish-brown to dark brown (Fig. 14a, b ).

Variation. Length of body of female 3.6-3.9 mm, of fore wing of female 2.9-3.5 mm and of ovipositor sheath 2.0-2.6 mm; second metasomal tergite medio-anteriorly blackish-brown.

Male. Length of body of male 3.1-3.4 mm, of fore wing of male 2.3-2.9 mm; antenna relatively longer, with 27 segments; second metasomal tergite sometimes largely rugose; body colour variable; head sometimes largely blackish-brown dorsally; middle lobe of mesoscutum sometimes yellowish-brown, without blackish-brown spot; third to sixth metasomal tergites sometimes blackish-brown posteriorly (fourth tergite sometimes black brown medially).

Biology.

Unknown.

Distribution.

China (Liaoning).

Etymology.

Named after the short medio-longitudinal carina posteriorly on the propodeum: “brevis” is Latin for “short” and “carina” is Latin for “ridge”.

Figures

Figure 13. Bracon (Lucobracon) brevicarinatus sp. nov., ♀, holotype, habitus lateral.

Figure 14. Bracon (Lucobracon) brevicarinatus sp. nov., ♀, holotype. a. Fore wing; b. Hind wing; c. Mesosoma, lateral view; d. Mesosoma, dorsal view; e. Metasoma, dorsal view; f. Hind leg, lateral view; g. Head, front view; h. Head, dorsal view; i. Head, lateral view; j. Propodeum, lateral view; k. First metasomal tergite, dorsal view; l. Apex of antenna; m. Apex of ovipositor, lateral view.