Streblocera (Asiastreblocera) laichauensis Long, 2025

Streblocera (Asiastreblocera) laichauensis Long , sp. nov.

Figures 1 View FIGURE 1 , 2 View FIGURE 2 , 21 View FIGURE 21

Type material. Holotype, ♀, labelled “Euph. 017 ” ( IEBR), NW Vietnam: Lai Chau, Tam Duong, Phong Tho , forest+bushes, sweep (nets), 19.x.2004, KD Long.

Diagnosis. Antenna with 19 antennomeres; scapus robust, expanded subapically, without horn subbasally; length of scapus 3.6 × its maximum width ( Fig. 2A View FIGURE 2 ), and 1.6 × of head height (in dorsal view); malar space 0.6 × as long as basal width of mandible; mesosoma 1.65 × as long as its height; in lateral profile, propodeum highly convex medially ( Fig. 1 View FIGURE 1 ); propodeum with basal carina; surface of propodeum with transverse rugae posteriorly ( Fig. 2F View FIGURE 2 ); first metasomal tergite distinctly widened basally, and nearly parallel behind spiracle ( Fig. 2E View FIGURE 2 ), length of first tergite 2.3 × as long as its apical width; apical width 2.2 × as long as its minimum width.

Notes. Streblocera (A.) laichauensis , sp. nov. shares the non-furcate medio-posterior projection from the fifth metasomal sternite with Streblocera (A.) olivera, Quicke & Purvis , from Thailand, but differs from the latter by having the following characters: 1) Malar space 0.6 × as long as basal width of mandible (vs 1.0 × in S. olivera ); 2) Length of first metasomal tergite 2.3 × its apical width (vs 1.65 × in S. olivera ); 3) Apical width of first tergite 2.5 × its minimum width (vs 3.1 × in S. olivera ); and 4) Vein cu-a of fore wing nearly interstitial (vs vein cu-a postfurcal in S. olivera ).

Description. Holotype, ♀; body length 2.7 mm, fore wing length 2.5 mm ( Fig. 1 View FIGURE 1 ).

Head. Antenna with 19 antennomeres; length of scapus 3.6 × its maximum width, face with blunt tooth-shaped horn in basal ( Fig. 2B View FIGURE 2 ); dorsally scapus 1.6 × of head height, and head 1.7 × as wide as height; first flagellomere lanceolate, second flagellomere inserted near middle of outer side of the first flagellomere ( Fig. 2D View FIGURE 2 ); in dorsal view, occipital carina widely incomplete medio-dorsally, width of head 1.7 × its median length, and 1.7 × width of mesoscutum (without tegulae); temple roundly narrowed behind eye; length of eye 4.25 × as long as temple; ocelli small, in high triangle, POL: OD: OOL = 4: 3: 7 ( Fig. 2A View FIGURE 2 ); eye 2.1 × as high as broad; in lateral view, width of eye 3.5 × temple; in frontal view, diameter of antennal socket 4.0 × distance between sockets; face width 8.5 × length of face and clypeus combined, and 1.1 × height of eye; ventral margin of clypeus evenly curved; malar space 0.6 × as long as basal width of mandible, and 0.25 × as long as eye height; distance between tentorial pits 2.6 × distance from pit to eye margin; face and clypeus shiny, with finely punctures; frons coriaceous; temple and vertex polished, smooth ( Figs 2A, B View FIGURE 2 ).

Mesosoma. In lateral view, length of mesosoma 1.6 × as long as its height; notauli sparsely crenulated, narrowed posteriorly, nearly smooth ( Fig. 2C View FIGURE 2 ); prescutellar sulcus wide and deep, 0.8 × as long as scutellum, with one carina ( Fig. 2C View FIGURE 2 ); mesoscutum and scutellum smooth; subalar depression almost smooth; pronotal side wide, largely smooth, sparsely crenulated anteriorly; precoxal sulcus short and deep, sparsely crenulated; mesopleuron largely smooth; propodeum convex medially, with median carina occupying 0.3 basal; propodeum smooth basally, with sparse transverse rugae posteriorly ( Fig. 2F View FIGURE 2 ).

Wings. Length of fore wing 2.8 × its width; length of pterostigma 3.2 × its width, 1.45 × vein 1-R1 ( Fig. 2G View FIGURE 2 ); vein r arising behind middle of pterostigma, 0.4 × as long as width of pterostigma, and 0.2 × vein 1-R1; vein 1-CU1 short and thick, nearly quadrate ( Fig. 2G View FIGURE 2 ); vein cu-a 4.8 × vein 2-CU1; hind wing: M+CU: 1-M: 1r-m: 2-SC+R = 17: 4: 6: 5.

Legs. Length of hind femur, tibia and basitarsus 7.5, 16.7 and 12.0 × as long as their maximum width, respectively; hind basitarsus 0.4 × hind tibia, and 0.8 × second–fifth tarsus combined; fourth hind tarsus as long as fifth tarsus (without pretarsus).

Metasoma. First tergite metasomal tergite distinctly widened basally ( Fig. 2E View FIGURE 2 ); length of first tergite 2.3 × its apical width, apical width of first tergite 2.5 × its minimum width; first metasomal tergite largely smooth basally and apically, rugo-striate medially ( Fig. 2E View FIGURE 2 ); the rest tergites highly smooth; ovipositor sheath very short.

Colour. Antenna yellow; head and mesosoma yellow; eyes silver-grey; legs and metasoma whitish yellow, except first metasomal tergite and ovipositor sheath yellowish brown; wing veins yellow; wing membrane hyaline.

Male. Unknown.

Host. Unknown.

Etymology. Named after type locality, Lai Chau province, Northwestern Vietnam.

Distribution. NW Vietnam: Lai Chau province (Tam Duong) ( Fig. 21 View FIGURE 21 ).