Aulacocentrum intermedium Long & van Achterberg, 2024

Pham, Thi Nhi, Long, Khuat Dang, van Achterberg, Cornelis, Cao, Thi Quynh Nga, Pham, Van Phu & Dang, Thi Hoa, 2024, Revisionary notes on the genus Aulacocentrum Brues (Hymenoptera, Braconidae, Macrocentrinae) from Vietnam, ZooKeys 1197, pp. 13-41 : 13

Aulacocentrum intermedium Long & van Achterberg sp. nov.

Figs 9 , 10 , 16

Material.

Holotype, ♀, "Macr. 174 " (IEBR), NE Vietnam: Cao Bang, Ha Quang, Yen Son , forest, 22°47'11.2"N, 104°54'06"E, 987 m, light trap, 12.vi.2023, Pham TN, Pham VP, Dang TH.

Description.

Holotype, female, body length 8.9 mm; fore wing length 7.8 mm; ovipositor 9.0 mm (Fig. 9 ).

Head. Antenna with 47 flagellomeres; first flagellomere 1.2 × second one; length of first and second flagellomeres 6.0 and 4.8 × their widths, respectively; in frontal view, width of face 0.9 × its length (Fig. 10B ); length of maxillary palp 1.4 × height of head; face densely punctate; malar space as long as basal width of mandible (Fig. 10C ); clypeus less convex (Fig. 10C ); straight ventrally, sparsely, finely punctate; distance between tentorial pits 1.6 × distance from pit to eye margin; in dorsal view, width of head 2.6 × median length (Fig. 10A ); eye 8.5 × as long as temple; OOL: OD: POL = 7: 8: 10 (Fig. 10A ); frons, vertex and temple shiny, smooth.

Mesosoma. Length of mesosoma 1.5 × its height (Fig. 10E ); pronotal trough largely crenulate medially, mostly smooth ventrally and dorsally; propleuron with fine dense punctures (Fig. 10E ); middle lobe of mesoscutum densely punctate; lateral lobes of mesoscutum sparsely punctate; notauli narrow, sparsely crenulate anteriorly, narrowly fused posteriorly with median rugosity (Fig. 10D ); scutellar sulcus with three median carina, 0.5 × scutellum; scutellum densely punctate; mesopleuron and metapleuron largely rugose-punctate (Fig. 10E ); propodeum mostly irregularly rugulose (Fig. 10F ).

Wings. Length of fore wing 4.1 × its maximum width (Fig. 10H ); length of pterostigma 4.9 × its width; fore wing vein SR1 2.2 × as long as vein 3-SR; r: 3-SR: SR1 = 10: 28: 63; cu-a: 1-CU1: 2-CU1 = 4: 9: 50; 2-SR: 3-SR: r-m = 13: 28: 9; second submarginal cell of fore wing narrowed distally; hind wing with vein 2-SC+R horizontal (= longitudinal); vein SC+R1 evenly curved (Fig. 10J ); cu-a: 1-M: 1r-m = 10: 15: 15; marginal cell sparsely setose.

Legs. Hind coxa densely setose latero-ventrally, rugose-punctate dorsally, without striation apically (Fig. 10I ); length of femur, tibia, and basitarsus of hind leg 9.8, 17.7, and 8.0 × their maximum widths, respectively; left hind trochantellus with four teeth in one row; length of hind inner and outer tibial spurs 0.4 × and 0.3 × hind basitarsus, respectively; length of hind basitarsus 0.3 × hind tibia and 1.1 × second-fifth tarsal segments combined.

Metasoma. Length of metasoma 1.3 × head and mesosoma combined; laterope large, fused into a groove posteriorly (Fig. 10G ); first tergite evenly widened apically, with medio-basal depression (Fig. 10K ); length of first tergite 4.1 × its apical width (Fig. 10K ); first metasomal tergite parallel-sided, with curved striation medially; second tergite 1.1 × third tergite medially (Fig. 10K ); second tergite weakly constricted medially, with convergent striae on basal 2/3 of tergite, with parallel striation apically; third tergite mostly coriaceous, with superficial micro-striae basally; remaining metasomal tergites coriaceous, with dense setae.

Colour. Scapus largely whitish yellow, pale brown dorso-apically; flagellum dark brown, with 9th-18th middle flagellomeres ivory; palpi cream-white; fore leg yellow except coxa, trochanter and trochantellus whitish yellow; middle leg yellow, except basitarsus and second brown; hind coxa reddish yellow, hind trochanter and trochantellus yellow, hind femur blackish brown to black, reddish yellow at extreme base; apical 1/2 of hind tibia blackish brown, pale yellow basally; hind tibial spurs and tarsus cream-white; pronotum yellow; mesonotum black; metapleuron yellow; propodeum black medio-posteriorly, yellow basally and ventrally; tegula whitish yellow; wing veins brown; parastigma yellow; pterostigma dark brown, yellow basally and apically; wing membrane hyaline; basal 2/3 of first metasomal tergite pale yellow, apical 1/3 black; second tergite entirely black; basal 2/3 of third tergite whitish yellow, black apically; the remainder blackish brown to black; hypopygium brown; ovipositor sheath brown; ovipositor yellow.

Male. Unknown.

Biology.

Unknown.

Etymology.

From inter in Latin meaning “between”, because this new species is intermediate between A. imparum sp. nov. and A. philippinense .

Distribution.

NE Vietnam (Cao Bang) (Fig. 16 ).

Notes.

This new species is similar to A. philippinense (Ashmead) but can be separated from the latter by the following characters: 1) first metasomal tergite with basal depression (vs flat in A. philippinense ); 2) second metasomal tergite weakly constricted medio-laterally (vs distinctly constricted medio-laterally in A. philippinense ); 3) stemmaticum coriaceous (vs stemmaticum rugulose in A. philippinense ); and 4) hind coxa rugose-punctate dorsally with oblique striation dorso-laterally (vs nearly smooth with transverse striation dorso-apically in A. philippinense ).

Figures

Figure 9. Habitus of Aulacocentrum intermedium Long & van Achterberg, sp. nov., holotype, female, lateral, " Macr. 174 " (IEBR).

Figure 10. Aulacocentrum intermedium Long & van Achterberg, sp. nov., holotype, female, " Macr. 174 " (IEBR) A head, dorsal B head, frontal C propodeum, lateral D mesonotum E mesopleuron F propodeum, dorsal G first metasomal tergite, lateral, arrow indicates laterope H fore wing I hind coxa, dorsal J hind wing (part) K first-third metasomal tergites, dorsal, arrow indicates medio-basal depression.

Figure 16. Distribution map of Aulacocentrum species.