Stantonia stilpnosoma Long & van Achterberg

Achterberg, Cornelis van, Long, Khuat Dang & Chen, Xue-xin, 2017, Review of Stantonia Ashmead (Hymenoptera, Braconidae, Orgilinae) from Vietnam, China, Japan, and Russia, with descriptions of six new species, ZooKeys 723, pp. 61-119 : 91-96

Stantonia stilpnosoma Long & van Achterberg sp. n. Figs 81, 82-92, 93-94

Type material.

Holotype, ♀ (IEBR), “Orgi.004”, "N.W. Vietnam: Hoa Binh, Yen Thuy, orchard, MT 20°23'N, 105°36'E, 55 m, 1-10.ix.2001, K.D. Long". Paratypes (2 ♀ + 4 ♂): 1 ♂ (IEBR), “Orgi.038”, "N.E. Vietnam, Phu Tho, Xuan Son N.P., 20.v.2005, P.Th. Nhi"; 1 ♀ (RMNH), "N. Vietnam: Ninh Binh, Cuc Phuong N.P., n[ea]r entrance, c. 225 m, 15.v.-27.v.2000, [Mal. tr.] I, Mai Phu Quy, RMNH’00”; 2 ♂ (RMNH, IEBR), id., but 1-15.v.2000, Malaise trap II; 1 ♀ + 1 ♂ (RMNH), id., 18. viii– 17.ix.2000.

Diagnosis.

Antenna of ♀ 1.7-1.8 times as long as fore wing (of ♂ 2.1 times), without white or ivory segments and largely dark brown; anterior tentorial pits dor sally distinctly above lower level of eyes and malar space comparatively short (Fig. 88); frons brownish yellow medially; clypeus convex (Fig. 88); middle lobe of mesoscutum brownish yellow medially; mesopleuron ventrally and mesosternum yellowish brown; propodeum strongly shiny and with weak transverse rugae; vein r-m of fore wing partly pigmented (Fig. 82); fore wing hardly darkened apically (Fig. 82); hind femur slender, ventrally nearly entirely yellowish, finely punctate and interspaces smooth and shiny; hind coxa strongly shiny dorsally (Fig. 86); hind basitarsus moderately slender, whitish and usually erect bristly setose (Fig. 86), remainder dark brown; first metasomal tergite of ♀ strongly shiny and 3.3-3.6 times as long as its apical width; apex of first tergite and base of second tergite yellowish brown; second tergite of ♀ 1.6-1.7 times as long as wide; second metasomal suture straight and medial area behind suture flat or nearly so (Fig. 85); second epipleuron entirely yellow; third tergite distinctly punctate posteriorly; length of ovipositor sheath 0.10-0.17 times fore wing, distinctly less than half length of metasoma.

The new species runs in the key by van Achterberg (1987) to S. sumatrana Enderlein, but differs by having the first metasomal tergite of ♀ 3.3-3.7 times as long as its apical width (2.4-2.7 times in S. sumatrana ), ventrally hind femur smooth and shiny between punctures (coriaceous and dull), length of ovipositor sheath 0.10-0.15 times fore wing (0.16-0.19 times), and second and following hind tarsal segments dark brown (white or ivory, except dark telotarsus, rarely infuscated).

Description.

Holotype, female. Body length 5.4 mm, fore wing length 5.6 mm, ovipositor sheath 0.6 mm.

Head. Antenna with 46 segments but incomplete, at least 1.6 times as long as fore wing; middle segments twice as long as wide, third and fourth segments 3.3 and 2.3 times as long as wide, respectively, and third segment 1.2 times fourth segment; width of face 0.9 times height of face and clypeus combined (Fig. 88); maxillary palp 1.25 times as long as height of head; malar space 1.5 times as long as basal width of mandible; clypeus distinctly convex (Figs 88, 90); distance between tentorial pits twice as long as distance from pit to eye margin; in frontal view length of eye 2.4 times as long as its width; in dorsal view length of eye 2.5 times as long as temple; POL:OD:OOL = 2:3:7; distance between anterior and lateral ocellus 0.5 times OD (Fig. 88); face dull with sparse fine punctures and long setae; vertex and temple with sparse fine punctures; occipital flange wide and lamelliform.

Mesosoma. Length of mesosoma 1.4 times its height; pronotal side smooth dorsally and remainder sparsely finely punctate, medial sulcus with several crenulae anteriorly; notauli narrow and sparsely crenulate (Fig. 84); lobes of mesoscutum and scutellum with sparse fine punctures; precoxal sulcus narrow and finely crenulate (Fig. 83), area above precoxal sulcus almost smooth, area below precoxal sulcus with sparse fine punctures as metapleuron; propodeum shiny and largely smooth with basal medio-longitudinal carina and 2 transverse carinae medially (Fig. 84).

Wings. Fore wing: pterostigma 5.0 times as long as wide; r:2-SR:3-SR+SR1:r-m = 7:9:31:5; r issued behind middle of pterostigma; r-m present (Fig. 82); cu-a interstitial; basal half of CU1a mainly only pigmented; CU1b: 3-CU1 = 3:4. Hind wing: M+CU:1-M: 1r-m = 4:26:1; R1 with three distinct hamuli.

Legs. Ventrally hind femur punctate and interspaces smooth and shiny; length of femur, tibia and basitarsus of middle leg 10.2, 11.7 and 13.3 times as long as their width, respectively; inner and outer middle tibial spurs 0.5 and 0.4 times as long as basitarsus; length of femur, tibia and basitarsus of hind leg 4.9, 8.0 and 9.2 times their width, respectively; inner and outer hind tibial spurs 0.4 and 0.3 times as long as basitarsus, respectively.

Metasoma. First tergite almost parallel-sided, 3.3 times as long as its apical width, its surface largely smooth (Fig. 85); first tergite 1.4 times as long as propodeum; second tergite smooth (except for some punctures), elongate and shiny, 1.7 times longer than its basal width; length of ovipositor sheath 0.10 times as long as fore wing; ovipositor thick.

Colour. Yellowish brown; antenna brown but apically dark brown; tegulum and humeral plate pale yellow; stemmaticum, pterostigma, veins and middle tarsus dark brown or infuscated, but middle basitarsus yellowish basally; apical one fourth of hind tibia and second–fifth hind tarsal segments black; hind basitarsus ivory, but apically dark brown; fore wing slightly infuscated apically.

Male. Very similar to female: length of body 6.0-7.1 mm, of fore wing 3.3-6.0 mm; antenna with 55(1), 57(1) segments and 2.1 times as long as fore wing; length of femur, tibia and basitarsus of hind leg 4.8, 8.6 and 9.0 times their width, respectively; fore wing: r:2-SR:3-SR+SR1 = 8:10:27; CU1b: 3-CU1 = 3:7; hind wing: M+CU:1-M: 1r-m = 8:30:2; propodeum without or with basal medio-longitudinal carina and with 2-5 transverse carinae medially.

Variation.

Female: length of body 5.4-6.9 mm, of fore wing 5.3-6.0 mm; vein cu-a of fore wing antefurcal (Fig. 82) or interstitial; length of first tergite 3.3-3.6 times length of fore wing; length of ovipositor sheath 0.10-0.17 times fore wing; first tergite 3.3-3.6 times its apical width; length of mesosoma 1.4-1.5 times its height; length of first metasomal tergite 3.4-3.8 times its apical width; length of ovipositor sheath 0.10-0.17 times length of fore wing; fore wing slightly infuscated apically.

Distribution.

Vietnam (Phu Tho (Xuan Son N.P.); Hoa Binh; Ninh Binh (Cuc Phuong N.P.)).

Etymology.

Named after the very shiny ( “stilpnos” is Greek for "glittering, glisterning") body ( “soma” in Greek) of this species.