Bracon (Uncobracon) eurysulcatus sp. nov. Figs 23, 24

Type material.

Holotype. ♀, China, Guangxi Prov., Longzhou Nonggang, 20.V.1982, He Junhua, No. 821603 (ZJUH).

Diagnosis.

This new species is very similar to B. (U.) tricoloratus Tobias, 2000, but can be separated from the latter by the following characters: in dorsal view length of eye 2.6 × temple (1.8 × temple in B. (U.) tricoloratus); scutellar suture rather wide, with sparse (four) crenulae (relatively narrow, with at least eight crenulae); first and second metasomal tergites whitish-yellow and with black spots (entirely blackish-brown); medio-basal area of second tergite connected to medio-longitudinal carina distally (without medio-longitudinal carina).

Description.

Holotype, ♀, length of body 5.6 mm, of fore wing 6.0 mm, of ovipositor sheath 3.6 mm.

Head. Antenna with 43 segments; apical antennal segment with a short spine apically, 2.3 × longer than its maximum width (Fig. 24l); first flagellomere 1.4 × longer than wide, 1.1 and 1.2 × longer than second and third, respectively, the latter being 1.2 × longer than wide; malar suture rather weak, with some short setae; clypeus height: inter-tentorial distance: tentorio-ocular distance = 3: 10: 5; clypeus sparsely short setose; eye nearly not emarginate (Fig. 24g); face transverse rugose, weakly convex medially and with dense long setae laterally (Fig. 24g); eye height: shortest distance between eyes: head width = 15: 19: 40; frons weakly granulate, weakly concave behind antennal sockets, with a median groove and densely short setose laterally (Fig. 24h); vertex weakly granulate, with dense short setae; shortest distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: shortest distance between posterior ocellus and eye = 3: 3: 7; temples strongly narrowed behind eyes (Fig. 24h).

Mesosoma. Length of mesosoma 1.3 × its height (Fig. 24c); notauli complete and deeply impressed (Fig. 24d); mesoscutum smooth, with sparse short setae along notaulic courses (Fig. 24d); scutellar sulcus deep, wide, with four strong crenulae (Fig. 24d); scutellum smooth, with dense short setae posteriorly; metanotum moderately convex medially, with a short carina anteriorly (Fig. 24d); propodeum largely smooth, with a complete medio-longitudinal carina and a few oblique short carinae laterally and laterally with dense long setae (Fig. 24d).

Wings. Fore wing (Fig. 24a): SR1: 3-SR: r = 53: 27: 9; 1-SR+M weakly curved posteriorly, 1.3 × longer than 1-M; 2-SR: 3-SR: r-m = 17: 27: 13; m-cu straight, 1.5 × longer than 2-SR+M; angle between 1-SR and C+SC+R about 80°; cu-a interstitial. Hind wing (Fig. 24b): SC+R1: 2-SC+R: 1r-m = 20: 5: 9.

Legs. Length of fore femur: tibia: tarsus = 30: 34: 37; length of hind femur: tibia: basitarsus = 45: 54: 20; length of femur, tibia and basitarsus of hind leg 4.6, 8.3 and 5.7 × their maximum width, respectively; hind tibial spurs 0.4 and 0.5 × as long as hind basitarsus.

Metasoma. Length of first tergite 0.9 × its apical width; first tergite concave medio-basally, median area convex and strongly sculptured posteriorly, with a short medio-longitudinal carina posteriorly (Fig. 24k); lateral grooves of first tergite moderately wide, with sparse weak crenulae (Fig. 24k); second tergite coarsely sculptured, with a small and rugose triangular medio-basal area connected to medio-longitudinal carina apically (Fig. 24e); second metasomal suture wide, deep, with sparse, but strong crenulae, curved medially (Fig. 24e); third tergite with fine antero-lateral grooves; third to sixth tergites coarsely sculptured (Fig. 24e); seventh tergite smooth (Fig. 24e); setose part of ovipositor sheath 0.6 × length of fore wing.

Colour. Head and mesosoma largely reddish-yellow (Fig. 23); antenna, eye, mandible apically, metapleuron and propodeum black (Fig. 24c, d, g); fore leg reddish-yellow (but claws black), middle and hind legs black (Figs 23, 24f); metasoma largely black, first and second metasomal tergites laterally, third tergite antero-laterally and seventh tergite posteriorly yellow (Fig. 24e, k); ovipositor sheath black (Fig. 23); wing membrane pale infuscate, pterostigma and veins dark brown (Fig. 24a, b).

Biology.

Unknown.

Distribution.

China (Guangxi).

Etymology.

Named after the wide scutellar sulcus: “eurys” is Greek for “wide” and “sulcus” is Latin for “groove” .