Bracon (Lucobracon) flavitestaceus, 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
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|Bracon (Lucobracon) flavitestaceus|
Holotype. ♀, China, Jilin Prov., Tonghua, 1.VIII.1994, Lou Juxian, No. 976765 ( ZJUH). Paratypes. 1♀, China, Liaoning Prov., Shenyang Dongling, 6.V.1994, Lou Juxian, No. 947493 ( ZJUH); 1♂, China, Jilin Prov., Antu, 5-6.VIII.1994, Lou Juxian, No. 977054 ( ZJUH).
This new species is very similar to B. (L.) fortipes (Wesmael, 1838), but can be separated from the latter by the following characters: third metasomal tergite smooth (coarsely sculptured in B. (L.) fortipes ); hind femur 3.5 × longer than its maximum width (2.5 times); fore wing vein SR1 2.2 × longer than vein 3-SR (1.5 times); setose part of ovipositor sheath distinctly shorter than hind tibia (as long as hind tibia + first and second of tarsus combined); body largely yellowish-brown (largely reddish-brown).
Holotype, ♀, length of body 2.9 mm, of fore wing 2.8 mm, of ovipositor sheath 0.4 mm.
Head. Antenna with 25 segments; apical antennal segment acute, 2.3 × longer than its maximum width (Fig. 20l View Figure 20 ); first flagellomere 2.2 × longer than wide, 1.1 and 1.2 × longer than second and third, respectively, the latter being 1.6 × longer than wide; malar suture rather weak, with some short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 4: 12: 5; clypeus sparsely short setose; eye not emarginate (Fig. 20g View Figure 20 ); face largely weakly granulate and with dense short setae laterally (Fig. 20g View Figure 20 ); eye height: shortest distance between eyes: head width = 11: 15: 28; frons weakly granulate, weakly concave behind antennal sockets, with a rather weak median groove (Fig. 20h View Figure 20 ); vertex smooth, with sparse short setae; shortest distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: shortest distance between posterior ocellus and eye = 5: 3: 7; temples subparallel-sided behind eyes (Fig. 20h View Figure 20 ).
Mesosoma. Length of mesosoma 1.4 × its height (Fig. 20c View Figure 20 ); notauli only impressed anteriorly (Fig. 20d View Figure 20 ); mesoscutum smooth, with sparse short setae along imaginary notaulic courses (Fig. 20d View Figure 20 ); scutellar sulcus deep, moderately wide, with crenulae (Fig. 20d View Figure 20 ); scutellum smooth, with some short setae posteriorly; metanotum moderately convex medially (Fig. 20d View Figure 20 ); propodeum largely smooth, with medio-longitudinal carina beyond middle of propodeum (but absent anteriorly) and sparsely setose medially, with dense long setae laterally (Fig. 20e View Figure 20 ).
Wings. Fore wing (Fig. 20a View Figure 20 ): SR1 not reaching tip of wing; SR1: 3-SR: r = 36: 16: 9; 1-SR+M more or less straight, 1.5 × longer than 1-M; 2-SR: 3-SR: r-m = 15: 16: 10; m-cu straight, 1.5 × longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a weakly postfurcal. Hind wing (Fig. 20b View Figure 20 ): SC+R1: 2-SC+R: 1r-m = 14: 3: 5.
Legs. Length of fore femur: tibia: tarsus = 21: 26: 27; length of hind femur: tibia: basitarsus = 24: 38: 13; length of femur, tibia and basitarsus of hind leg 3.5, 8.4 and 4.6 × their maximum width, respectively; hind tibial spurs 0.3 and 0.4 × as long as hind basitarsus.
Metasoma. Length of first tergite 0.9 × its apical width; first tergite concave medio-basally, median area convex and smooth anteriorly, rugose posteriorly (Fig. 20j View Figure 20 ); lateral grooves of first tergite moderately wide, with sparse weak crenulae (Fig. 20j View Figure 20 ); second tergite with longitudinal striae, but laterally and posteriorly smooth (Fig. 20e View Figure 20 ); median length of second tergite slightly shorter than that of third tergite; second metasomal suture moderately narrow, crenulate, more or less straight medially (Fig. 20e View Figure 20 ); third to seventh tergites smooth (Fig. 20e View Figure 20 ); setose part of ovipositor sheath 0.1 × as long as fore wing.
Colour. Largely yellowish-brown (Fig. 19 View Figure 19 ); antenna, eye, mandible apically, frons medially and postero-laterally, area surrounding stemmaticum, propleuron laterally and mesopleuron posteriorly blackish-brown (Fig. 20c, d, g, h View Figure 20 ); propodeum posteriorly brown (Fig. 20e View Figure 20 ); telotarsus and claws dark brown (Fig. 20f View Figure 20 ); wing membrane pale infuscate, pterostigma dark brown and veins yellowish-brown to dark brown (Fig. 20a, b View Figure 20 ).
Variation. Length of body of female 2.9-3.6 mm, of fore wing of female 2.8-3.4 mm and of ovipositor sheath 0.4-0.5 mm; medio-longitudinal carina of propodeum nearly complete; fore wing vein m-cu 1.4-1.5 × longer than vein 2-SR+M; fore wing vein cu-a interstitial; length of first metasomal tergite 0.9-1.0 × its apical width; spot of head dorsally relatively paler; metasomal tergites largely yellow, first tergite anteriorly, laterally and posteriorly infuscate.
Male. Length of body of male 3.1 mm, of fore wing of male 2.9 mm; antenna with 27 segments; pronotal side with an oblique transverse blackish-brown stripe.
China (Jilin, Liaoning).
Named after the body colour: “flavus” is Latin for “yellow” and “adustus” is Latin for “brown”.
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