Bracon (Glabrobracon) longistriatus, 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

publication ID

https://dx.doi.org/10.3897/dez.67.57668

publication LSID

lsid:zoobank.org:pub:41F77B2A-0E1C-4874-AE89-1E72B3DD6A32

persistent identifier

https://treatment.plazi.org/id/9D9986AE-1975-4716-A0F0-4F48895326BB

taxon LSID

lsid:zoobank.org:act:9D9986AE-1975-4716-A0F0-4F48895326BB

treatment provided by

Deutsche Entomologische Zeitschrift by Pensoft

scientific name

Bracon (Glabrobracon) longistriatus
status

sp. nov.

Bracon (Glabrobracon) longistriatus sp. nov. Figs 7 View Figure 7 , 8 View Figure 8

Type material.

Holotype. ♀, China, Heilongjiang Prov., Yichun, 1985, Jin Liyuan, No. 864358 ( ZJUH). Paratypes. 12♀♀9♂♂, China, Heilongjiang Prov., Yichun, 1985, Jin Liyuan, No. 864365, 864737, 864740, 864739, 864358 (17 specimens) ( ZJUH); 26♀♀28♂♂, China, Heilongjiang Prov., Yichun, 1985.VII, Jin Liyuan, No. 851834 (20 specimens) (host Pissodes nitidus Roelofs), No. 864359 (21 specimens), 864303 (4 specimens), 864296 (5 specimens); 4♀♀5♂♂, China, Heilongjiang Prov., Yichun, 19??, Jin Liyuan, No. 850134 (9 specimens) (host Pissodes sp.) ( ZJUH).

Diagnosis.

This new species is very similar to B. (G.) instabilis Marshall, 1897, but can be separated from the latter by the following characters: in dorsal view, temples gradually narrowed behind eyes and length of eye 1.4 × temple (temples strongly narrowed behind eyes and length of eye more than twice as long as temple in B. (G.) instabilis ); first metasomal tergite (except median area), second tergite (but infuscate medially) reddish-yellow, third tergite sometimes reddish-yellow basally (metasomal tergites often entirely blackish-brown); legs yellow and only claws dark brown (legs blackish-brown with yellow or yellowish-brown pattern); first metasomal tergite 1.0-1.1 × longer than its apical width (1.2-1.4 times).

Description.

Holotype, ♀, length of body 3.0 mm, of fore wing 3.2 mm, of ovipositor sheath 1.1 mm.

Head. Antenna incomplete, only remaining are scapus and pedicel; malar suture indistinct, with some short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 2: 11: 6; clypeus sparsely short setose; eye not emarginate (Fig. 8g View Figure 8 ); face largely smooth, except for a few weak punctures and with sparse short setae (Fig. 8g View Figure 8 ); eye height: shortest distance between eyes: head width = 12: 16: 31; frons smooth, slightly concave behind antennal sockets, with a rather weak median groove (Fig. 8h View Figure 8 ); vertex smooth, with sparse short setae; shortest distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: shortest distance between posterior ocellus and eye = 8: 5: 8; temples subparallel immediately behind eyes (Fig. 8h View Figure 8 ).

Mesosoma. Length of mesosoma 1.6 × its height (Fig. 8c View Figure 8 ); notauli relatively deeply impressed anteriorly, shallow posteriorly (Fig. 8d View Figure 8 ); mesoscutum largely smooth except for a few weak punctures posteriorly, with sparse setae posteriorly (Fig. 8d View Figure 8 ); scutellar sulcus deep, wide, with crenulae (Fig. 8d View Figure 8 ); scutellum smooth, with dense setae posteriorly; metanotum moderately convex medially (Fig. 8d View Figure 8 ); propodeum largely smooth, with a short medio-longitudinal carina posteriorly and sparsely setose medially, with dense long setae laterally (Fig. 8d View Figure 8 ).

Wings. Fore wing (Fig. 8a View Figure 8 ): SR1: 3-SR: r = 19: 9: 5; 1-SR+M more or less straight, 1.3 × longer than 1-M; 2-SR: 3-SR: r-m = 13: 18: 9; m-cu straight, 1.7 × longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a more or less interstitial. Hind wing (Fig. 8b View Figure 8 ): SC+R1: 2-SC+R: 1r-m = 19: 3: 8.

Legs. Length of fore femur: tibia: tarsus = 25: 27: 31; length of hind femur: tibia: basitarsus = 24: 35: 14; length of femur, tibia and basitarsus of hind leg 3.7, 7.0 and 4.7 × their maximum width, respectively; hind tibial spurs 0.3 and 0.4 × as long as hind basitarsus.

Metasoma. Length of first tergite 1.1 × its apical width; first tergite concave medio-basally, median area convex and with some striae (Fig. 8j View Figure 8 ); lateral grooves of first tergite moderately narrow, with sparse and weak crenulae (Fig. 8j View Figure 8 ); second tergite largely with striae, but laterally and posteriorly smooth (Fig. 8e View Figure 8 ); median length of second and third tergites about equal; second metasomal suture moderately narrow, crenulate, weakly curved medially (Fig. 8e View Figure 8 ); third to seventh tergites smooth (Fig. 8e View Figure 8 ); ovipositor sheath 0.3 × as long as fore wing.

Colour. Largely blackish-brown (Fig. 7 View Figure 7 ); pedicel apically, mandible (except for apically black brown) and legs (but claws dark brown) yellow (Figs 7 View Figure 7 , 8f, g View Figure 8 ); first metasomal tergite (but median area blackish-brown), second tergite (but medio-anteriorly blackish-brown) yellowish-brown (Fig. 8e, j View Figure 8 ); ovipositor sheath black (Fig. 7 View Figure 7 ); wing membrane pale yellow, pterostigma yellow and veins dark brown (Fig. 8a, b View Figure 8 ).

Variation. Length of body of female 3.0-4.5 mm, of fore wing of female 3.1-4.2 mm and of ovipositor sheath 1.0-2.0 mm; antenna of female with 28 segments; apical antennal segment acute, 2.6 × longer than its maximum width; first flagellomere 2.0 × longer than wide, 1.1 and 1.2 × longer than second and third, respectively, the latter being 1.6 × longer than wide; length of mesosoma 1.4-1.6 × its height; length of first tergite 1.0-1.1 × its apical width; ovipositor sheath 0.3-0.5 × as long as fore wing; third metasomal tergite sometimes basally yellowish-brown; pterostigma and veins yellowish-brown to dark brown.

Male. Length of body of male 2.3-3.3 mm, of fore wing of male 2.0-2.9 mm; metasomal tergites sometimes uniformly black brown.

Biology.

The type series has been reared from Pissodes sp. and Pissodes nitidus Roelofs ( Coleoptera: Curculionidae ).

Distribution.

China (Heilongjiang).

Etymology.

Named after the largely striate median area of the first metasomal tergite and the second tergite: “longus” is Latin for “long” and “striata” is Latin for "with striae".

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Braconidae

Genus

Bracon