Streblocera (Streblocera) setosa Long, 2025

Streblocera (Streblocera) setosa Long , sp. nov.

( Figs 17 View FIGURE 17 , 18 View FIGURE 18 , 21 View FIGURE 21 )

Type material. Holotype, ♀, labelled “Euph. 068 ” ( IEBR), N Vietnam: Ninh Binh, Cuc Phuong NP, forest, 20°23’N 105°34’E, 300 m, MT, 20–30.vii.2002, KD Long GoogleMaps . Paratype, 1♀, labelled “Euph. 400 ”, ( IEBR), NE Lang Son, Huu Lung , Huu Lien NR, forest, MT, 21°39’4’’N 106°21’51’E, 200 m, 15.ii.2024, PQ Mai, TD Duong .

Diagnosis. The new species is close to Streblocera (S.) hikoensis Belokobylskij , from Japan but differs by having 1) First metasomal tergite 2.6 × its apical width [vs 3.0× in S. (S.) hikoensis ] and apical width of first metasomal tergite 2.6 × its minimum width [vs 2.0 × in S. (S.) hikoensis ]; 2) Antenna with 15 antennomeres [vs 19 antennomeres in S. (S.) hikoensis ]; and 3) First–second flagellomeres with dense sensillae ventrally.

Description. Holotype, ♀; body length 2.3 mm, fore wing length 2.2 mm, ovipositor 0.6 mm ( Fig. 17 View FIGURE 17 ).

Head. Antenna with 15 antennomeres; length of scapus 8.75 × its maximum width ( Fig. 18H View FIGURE 18 ); scapus long and slender, 1.9 × of head height; first flagellomere straight, 6.5 × as long as its width medially ( Fig. 18F View FIGURE 18 ), and 3.25 × second flagellomere; and first flagellomere 0.4 × scapus; in dorsal view, occipital carina incomplete medio-dorsally ( Fig. 18A View FIGURE 18 ), width of head 1.6 × its median length, and 1.6 × width of mesoscutum (without tegulae); temple roundly narrowed behind eye; length of eye 2.4 × as long as temple; ocelli small, POL: OD: OOL = 2.5: 2.0: 6.0 ( Fig. 18A View FIGURE 18 ); eye 2.4 × as high as broad; in lateral view, transverse diameter of eye twice length of temple; in frontal view, diameter of antennal socket 2.0 × between sockets ( Fig. 18B View FIGURE 18 ); face width 0.9 × length of face and clypeus combined, and 1.1 × height of eye; clypeus margin straight; malar space as long as basal width of mandible, and 0.3 × as long as eye height; distance between tentorial pits 1.75 × distance from pit to eye margin; face smooth, with sparse fine punctures; clypeus smooth ( Fig. 18B View FIGURE 18 ); frons flat and smooth; temple and vertex polished smooth ( Fig. 18A View FIGURE 18 ).

Mesosoma. In lateral view, length of mesosoma 1.7 × as long as its height; notauli deep, evenly crenulated, divided posteriorly by a smooth groove ( Fig. 18D View FIGURE 18 ); prescutellar sulcus wide, deep, 0.5 × as long as scutellum, with one carina ( Fig. 18D View FIGURE 18 ); pronotal side crenulate medially, smooth dorsally and ventrally ( Fig. 18G View FIGURE 18 ); mesoscutal lobes and scutellum smooth; precoxal sulcus straight, in 0.7 posterior mesopleuron, and crenulate ( Fig. 18G View FIGURE 18 ); mesopleuron smooth; metapleuron reticulate-rugose; propodeum with short basal carina and areola medially, coriaceous basolaterally, with sparse transverse and convergent rugosities medially and laterally, finely rugose medio-posteriorly ( Fig. 18E View FIGURE 18 ).

Wings. Length of fore wing 2.0 × its width; length of pterostigma 3.1 × its width, and 3.6 × vein 1-R1 ( Fig. 18I View FIGURE 18 ); vein r arising far behind middle of pterostigma, 0.25 × as long as width of pterostigma, and 0.2 × vein 1-R1; vein 1-CU1: cu-a: 2-CU1 = 1.5: 2.0: 9.0; length of hind wing 4.0 × its width; 1-M: 1r-m: 2-SC+R = 2.5: 4.0: 4.0 ( Fig. 18J View FIGURE 18 ).

Legs. Length of hind femur, tibia and basitarsus 6.75, 12.70 and 8.70 × as long as their maximum width, respectively; hind basitarsus 0.3 × hind tibia, and 0.7 × second-fifth tarsus combined; fourth hind tarsus 0.8 × as long as fifth tarsus (without pretarsus).

Metasoma. First metasomal tergite elongate, slightly widened posteriorly, 2.6 × of its apical width ( Fig. 18C View FIGURE 18 ); and apical width 2.6 × minimum width of the tergite; dorsal carinae of first tergite uniting posteriorly in the middle of the tergite ( Fig. 18C View FIGURE 18 ), first metasomal tergite striate medially and apically, smooth apically ( Fig. 18C View FIGURE 18 ); the remaining tergites highly smooth; ovipositor 0.3 × fore wing, and 1.25 × first tergite; ovipositor strongly curved upwards ( Fig. 17 View FIGURE 17 ).

Colour. Body yellow; eyes silver-grey; palpi and glossa pale yellow; all legs yellow, except coxae, fore and middle tarsus paler; wing veins pale yellow; wing membrane hyaline; first metasomal tergite darker; ovipositor and ovipositor sheath pale yellow.

Male. Unknown.

Host: Unknown.

Etymology. (P.699): “ seta ” Latin for “bristle”; reference to first–second flagellomeres with dense sensillae ventrally.

Distribution. N Vietnam: Ninh Binh province (Cuc Phuong NP). ( Fig. 21 View FIGURE 21 ).