Streblocera (Eutanycerus) quangbinhensis Long, 2020

Long, Khuat Dang & Nhi, Pham Thi, 2020, Notes on the genus Streblocera Westwood, 1883 (Hymenoptera: Braconidae: Euphorinae) from Vietnam, with description of four new species, Zootaxa 4767 (3), pp. 402-414 : 406-409

Streblocera (Eutanycerus) quangbinhensis Long , sp. n.

( Figs 12–22 )

Material examined. Holotype ♀, “Euph. 159 ” ( IEBR), NC Vietnam: Quang Binh, Minh Hoa, Cha Lo , forest, 18.iv.1998, KDLong . Paratypes 2 ♀, “Euph. 158 ” ( IEBR), locality as holotype; “Euph. 201 ” ( IEBR), NC Vietnam: Ha Tinh, Huong Son, Rao An, forest path, 200m, 22.iv.1998, KDLong.

Diagnosis. Antenna 25 antennomeres; scapus long, evenly curved, with tooth-shaped horn in basal 0.2 of scapus ( Fig. 19 ); length of scapus 9.4 × its maximum width, and 2.3 × of head height (in dorsal view); tentorial pits at lower level of eyes ( Fig. 14 ); malar space 1.3 × as long as basal width of mandible; length of mesosoma 1.8 × as long as its height; propodeum with rather long basal carina and areola-shaped median area; first metasomal not narrowed behind spiracle; length of first tergite 1.6 × its apical width; apical width of first tergite 3.3 × its minimum width.

This new species is close to both S. tuyenquangnesis sp. n. and S. pila Belokobylskij , differences between these species are given in the key. The new species can be distinguished by shorter first metasomal tergite, 1.6 × its apical width (2.3–2.5 × its apical width in S. tuyenquangnesis and S. pila ).

Description. Holotype, ♀; body length 4.5 mm, fore wing length 4.2 mm, ovipositor sheath 0.8 mm ( Fig. 12 ).

Head. Antenna with 25 antennomeres; scapus long, slightly curved medially, length of scapus 9.4 × its maximum width (75: 8), with tooth-shaped horn in basal 0.2 of scapus (16: 75); scapus 2.3 × of head height (75: 33); third antennomere 1.3 × fourth (8: 6); second-seventh flagellomeres serrate ventrally ( Fig. 18 ); length from eighth flagellomere to apex of antenna 0.9 × scapus (71: 75); in dorsal view, width of head 1.5 × its median length (49: 33), 1.4 × width of mesoscutum (without tegulae) (49: 34); temple roundly narrowed behind eye; eye 2.25 × as long as broad; length of eye 1.8 × as long as temple (18: 10); ocelli small, POL: OD: OOL = 5: 3: 11 ( Fig. 13 ); in lateral view, transverse diameter of eye as long as temple (14: 14); in frontal view, diameter of antennal socket 1.1 × distance between sockets (9: 8); face width subequal to length of face and clypeus combined (28: 29), and 1.5 × height of eye (28: 19); clypeus margin straight; malar space 1.3 × as long as basal width of mandible (9: 7), and 0.5 × as long as eye height (9: 19); distance between tentorial pits 1.2 × distance from pit to eye margin (11: 9); face densely punctate ( Fig. 14 ); frons punctate laterally, with median sparse striae ( Fig. 13 ); vertex and temple almost smooth ( Figs 13, 15 ).

Mesosoma. Length of mesosoma 1.8 × as long as its height (83: 46); notauli deep, sparsely crenulated anteriorly, widened posteriorly and largely rugose ( Fig. 16 ), median lobe of mesoscutum without median depression; prescutellar sulcus rather wide, rugose, with one carina, and 0.7 × as long as scutellum (6: 9) ( Fig. 16 ); lobes of mesoscutum and scutellum sparsely punctate; subalar depression rugose ( Fig. 17 ); pronotal side crenulated anteriorly, rugose ventrally and posteriorly ( Fig. 17 ); precoxal sulcus deep and wide, crenulate; mesopleuron smooth medially, rugose ventrally ( Fig. 17 ); metapleuron rugose; propodeum with rather long basal carina ( Fig. 21 ) and areola-shaped median area, punctate basally, largely rugose apically.

20 First metasomal tergite 21 Propodeum 22 Fore wing.

Wings. Length of fore wing 2.8 × its width (127: 45); length of pterostigma 4.0 × its width (40: 10), and 1.5 × vein 1-R1 (40: 26) ( Fig. 22 ); vein r arising just behind middle of pterostigma, 0.1 × as long as width of pterostigma (4: 40), and 0.15 × vein 1-R1 (4: 26); vein 1-CU1 short and thick, nearly quadrate; cu-a 0.3 × vein 2-CU1 (5: 17) ( Fig. 22 ); length of hind wing 4.2 × its width (122: 29); vein 1-M: 1r-m: 2-SC+R = 5: 8: 8.

Legs. Length of hind femur, tibia and basitarsus 7.1, 16.25 and 14.0 × as long as their width, respectively; hind basitarsus 0.9 × hind tibia (58: 65); hind basitarsus 0.4 × hind tibia (28: 65), and as long as second-fifth tarsus (28: 28); fourth hind tarsus 0.7 × fifth tarsus without pretarsus (5:7).

Metasoma. First metasomal tergite not narrowed behind spiracle; length of first tergite 1.6 × its apical width (32: 20); apical width of first tergite 3.3 × its minimum width (20: 6); ovipositor sheath 0.2 × fore wing (8: 45), and 0.9 × first tergite (30: 32); first tergite almost smooth basally and medially, striate apically ( Fig. 20 ); the rest tergites highly smooth.

Colour. Body yellow, except first metasomal tergite and ovipositor sheath yellowish-brown; eyes brownishgrey; wing veins yellow; wing membrane hyaline.

Male. Unknown.

Host: Unknown.

Etymology. Named after type locality, Quang Binh Province, North Central Vietnam.

Variation. Paratypes, females, 23 antennomeres, body length 4.0– 4.2 mm, fore wing 4.0 mm.

Distribution. NC Vietnam: Ha Tinh, Quang Binh.

Figures

FIGURE 12. Streblocera (Eutanycerus) quangbinhensis Long, sp. n. Holotype, female. Habitus, lateral view

FIGURES 13–22. Streblocera (Eutanycerus) quangbinhensis Long, sp. n. Holotype, female. 13 Head, dorsal view 14 Head, frontal view 15 Head, lateral view 16 Mesonotum 17 Mesopleuron 18 First-seventh flagellomeres, lateral view 19 Scapus