Streblocera (Eutanycerus) hatinhensis Long, 2025

Streblocera (Eutanycerus) hatinhensis Long , sp. nov.

Figs 3 View FIGURE 3 , 4 View FIGURE 4 , 21 View FIGURE 21

Type material. Holotype, ♀, labelled “Euph. 195 ” ( IEBR), NC Vietnam: Ha Tinh, Huong Son, Rao An , forest, 200 m, sweep (nets), 14.v.1998, KD Long.

Diagnosis. Scapus slender, without tooth-shaped horn subbasally; length of scapus 7.6 × its maximum width, and 1.8 × of head height in dorsal view; first flagellomere 1.2 × as long as second flagellomere; seventh flagellomere with distinct like-horn process; occipital carina complete medio-dorsally; propodeum with subbasal areola.

Notes. S. (E.) hatinhensis , sp. nov. is relatively close to S. (E.) nectrangana , sp. nov. and S. (E.) opima but can be separated by occipital carina complete and propodeum with subbasal areola; and the other differences between them are given in the key.

Description. Holotype, ♀; body length 2.5 mm, fore wing length 2.5 mm, ovipositor sheath 0.4 mm ( Fig. 3 View FIGURE 3 ).

Head. Antenna with 20 antennomeres; length of scapus 7.6 × its maximum width ( Fig. 4E View FIGURE 4 ); first flagellomere 1.2 × second flagellomere; first to seventh flagellomeres straight ventrally; seventh flagellomere with a long, distinct like-horn process ( Fig. 4E View FIGURE 4 ); length from eighth flagellomere to apex of antenna 1.2 × as long as scapus; in dorsal view, occipital carina complete medio-dorsally ( Fig. 4A View FIGURE 4 ), width of head 1.5 × its median length, and 1.6 × width of mesoscutum (without tegulae), respectively; temple roundly narrowed behind eye; length of eye 2.3 × as long as temple; eye 2.0 × as high as broad; ocelli small, POL: OD: OOL = 3: 3: 8 ( Fig. 4A View FIGURE 4 ); in lateral view, transverse diameter of eye twice length of temple medially; in frontal view, diameter of antennal socket 1.2 × between sockets; clypeus margin straight; malar space as long as basal width of mandible, and 0.3 × as long as eye height; distance between tentorial pits 1.5 × distance from pit to eye margin; face finely rugo-punctate; clypeus coriaceous, with sparse fine punctures ( Fig. 4B View FIGURE 4 ); frons flat, mostly smooth, with sparse striate rugosities close to antennal sockets ( Fig. 4A View FIGURE 4 ); temple and vertex polished smooth.

Mesosoma. In lateral view, length of mesosoma 1.5 × as long as its height; notauli rather shallow and smooth anteriorly, wider posteriorly and fusing into posterior rugose area ( Fig. 4D View FIGURE 4 ); prescutellar sulcus wide, deep, 0.3 × as long as scutellum, with one carina ( Fig. 4D View FIGURE 4 ); lateral lobes of mesoscutum and scutellum smooth; median lobe of mesoscutum coriaceous anteriorly, rugo-punctate medio-posteriorly; pronotal side sparsely crenulated medially, smooth dorsally and ventrally ( Fig. 4C View FIGURE 4 ); precoxal sulcus wide, rugose; mesopleuron smooth; metapleuron rugose; propodeum with a short basal carina and sub-basal areola, with divergent carina medially, connecting lateral rugosities, sparsely finely rugose posteriorly ( Fig. 4G View FIGURE 4 ).

Wings. Length of pterostigma 3.0 × its width, 1.8 × vein 1-R1 ( Fig. 4H View FIGURE 4 ); vein r arising behind middle of pterostigma, 0.2 × as long as width of pterostigma, and 0.2 × vein 1-R1; vein 3-SR+SR1 widely curved ( Fig. 4H View FIGURE 4 ); vein 1-CU1 short, 0.6 × cu-a; vein cu-a 0.35 × 2-CU1; vein 1-M of hind wing very short; 1-M: 1r-m: 2-SC+R = 2.5: 5: 5.

Legs. Length of hind femur, tibia and basitarsus 7.0, 11.75 and 9.0 × as long as their maximum width, respectively; hind basitarsus 0.4 × hind tibia, and 0.75 × second-fifth tarsus combined; fourth hind tarsus 0.7 × as long as fifth tarsus (without pretarsus).

Metasoma. First metasomal tergite rather long, length of first tergite 2.2 × its apical width, apical width of first tergite 2.5 × its minimum width; ovipositor sheath 0.2 × fore wing, and 0.7 × first tergite; ovipositor weakly curved upwards; first metasomal tergite smooth basally, striate medially and apically; dorsal carinae of first tergite convergent and nearly united medially ( Fig. 4F View FIGURE 4 ); the rest tergites highly smooth.

Colour. Head and mesosoma yellow; scapus and pedicel yellow; flagellum brownish yellow; eyes brown; all legs pale yellow; first metasomal tergite, second-third tergites yellow, the remainder and ovipositor sheath brownish yellow; wing veins yellow; wing membrane hyaline.

Male. Unknown.

Host: Unknown.

Etymology. Named after type locality, Ha Tinh province, North Central Vietnam.

Distribution. NC Vietnam: Ha Tinh province (Huong Son) ( Fig. 21 View FIGURE 21 ).