Bracon (Uncobracon) longwangshanensis, 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 (Uncobracon) longwangshanensis sp. nov. Figs 25 , 26

Type material.

Holotype. ♀, China, Zhejiang Prov., Anji, Mt. Longwang, 31.VIII.1993, Xu Zaifu, No. 9310129 (ZJUH). Paratype. 1♀, China, Zhejiang Prov., Mt. Tianmu, 29.VII.1984, Qian Ying, No. 842895 (ZJUH).

Diagnosis.

This new species is very similar to B. (U.) eurysulcatus sp. nov., but can be separated from the latter by the following characters: metasomal tergites largely blackish-brown, third to fifth tergites laterally and sixth tergite (except medio-basally) white yellow, seventh tergite yellowish-brown (largely blackish-brown, first and second tergites whitish-yellow, with black spots in B. (U.) eurysulcatus ); propodeum with medio-longitudinal groove and with medio-longitudinal carina posteriorly (only with complete medio-longitudinal carina); second tergite without medio-longitudinal carina (medio-longitudinal carina connected to medio-basal area of second tergite); in dorsal view, length of eye 2.2 × temple (2.6 times); hind femur 3.2 × longer than its maximum width (4.6 times).

Description.

Holotype, ♀, length of body 5.1 mm, of fore wing 4.9 mm, of ovipositor sheath 3.0 mm.

Head. Antenna with 35 segments; apical antennal segment strongly acute, 2.7 × longer than its maximum width (Fig. 26l ); first flagellomere 2.1 × longer than wide, 1.2 and 1.3 × longer than second and third, respectively, the latter being 1.8 × longer than wide; malar suture rather weak, with some short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 3: 8: 4; clypeus sparsely short setose; eye nearly not emarginate (Fig. 26g ); face weakly granulate and with dense short setae laterally (Fig. 26g ); eye height: shortest distance between eyes: head width = 17: 15: 31; frons weakly granulate, weakly concave behind antennal sockets, with a indistinct median groove and sparsely short setose laterally (Fig. 26h ); vertex largely smooth, with sparse short setae; shortest distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: shortest distance between posterior ocellus and eye = 3: 3: 5; temples linearly narrowed behind eyes (Fig. 26h ).

Mesosoma. Length of mesosoma 1.6 × its height (Fig. 26c ); notauli complete and deeply impressed (Fig. 26d ); mesoscutum weakly punctate, with relatively dense short setae along notaulic courses (Fig. 26d ); scutellar sulcus deep, wide, with four sparse strong crenulae (Fig. 26d ); scutellum smooth, with dense short setae posteriorly; metanotum moderately convex medially, with a short carina anteriorly (Fig. 26d ); propodeum largely smooth except for weakly rugose medially, with a strong medio-longitudinal groove and with a short medio-longitudinal carina posteriorly and with dense long setae laterally (Fig. 26d ).

Wings. Fore wing (Fig. 26a ): SR1: 3-SR: r = 35: 22: 7; 1-SR+M more or less straight, 1.2 × longer than 1-M; 2-SR: 3-SR: r-m = 6: 11: 4; m-cu straight, 1.2 × longer than 2-SR+M; angle between 1-SR and C+SC+R about 75°; cu-a interstitial. Hind wing (Fig. 26b ): SC+R1: 2-SC+R: 1r-m = 8: 2: 5.

Legs. Length of fore femur: tibia: tarsus = 22: 24: 31; length of hind femur: tibia: basitarsus = 29: 42: 14; length of femur, tibia and basitarsus of hind leg 3.2, 7.6 and 5.6 × their maximum width, respectively; hind tibial spurs 0.5 and 0.6 × as long as hind basitarsus.

Metasoma. First tergite as long as its apical width; first tergite concave medio-basally, median area convex and strongly sculptured posteriorly, without medio-longitudinal carina (Fig. 26k ); lateral grooves of first tergite moderately wide, with sparse crenulae (Fig. 26k ); second tergite coarsely sculptured, with a small and rugose triangular medio-basal area, without medio-longitudinal carina (Fig. 26e ); second metasomal suture wide, deep, with strong crenulae, weakly curved medially (Fig. 26e ); third tergite with fine antero-lateral grooves; third to sixth tergites with subposterior transverse grooves (but absent medially on third tergite); third to fifth tergites coarsely sculptured (Fig. 26e ); sixth and seventh tergites weakly rugose, posteriorly smooth (Fig. 26e ); ovipositor sheath 0.6 × as long as fore wing.

Colour. Head and mesosoma largely pale reddish-yellow (Fig. 25 ); antenna (but inner side of scapus yellow), eyes, mandible apically, metanotum and propodeum (but laterally reddish-yellow) black (Fig. 26d, g ); fore leg yellow (but claws black), middle (except for trochanter and femur yellow) and hind leg black (Figs 25 , 26f ); metasoma largely black, second to fifth metasomal tergites laterally and sixth tergite (but medio-basally black) whitish-yellow, seventh tergite yellowish-brown (Fig. 26e, k ); ovipositor sheath black (Fig. 25 ); wing membrane pale fruscate, pterostigma and veins dark brown (Fig. 26a, b ).

Variation. Length of body of female 5.0-5.1 mm, of fore wing of female 4.7-4.9 mm and of ovipositor sheath 2.7-3.0 mm; mesopleuron posteriorly and metapleuron black; middle femur black; whitish-yellow area of second to fifth metasomal tergites relatively larger in paratypes.

Biology.

Unknown.

Distribution.

China (Zhejiang).

Etymology.

Named after the type locality, Longwangshan, Zhejiang Province.

Figures

Figure 25. Bracon (Uncobracon) longwangshanensis sp. nov., ♀, holotype, habitus lateral.

Figure 26. Bracon (Uncobracon) longwangshanensis 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. Mandible, lateral view; k. First metasomal tergite, dorsal view; l. Apex of antenna.