Streblocera (Eutanycerus) parucifera Long, 2025

Streblocera (Eutanycerus) parucifera Long , sp. nov.

Figures 9 View FIGURE 9 , 10 View FIGURE 10 , 21 View FIGURE 21

Type material. Holotype, ♀, labelled “Euph. 394 ” ( IEBR), NE Vietnam: Lang Son, Huu Lung, Huu Lien , forest, 21°39’56’’N 106°21’56’’E, 190 m, light trap, 6.viii.2024, KD Long. GoogleMaps

Diagnosis. S. (E.) parucifera , sp. nov. shares with S. uncifera scapus long and slender, weakly expanded, evenly curved, with a small tooth-shaped horn, and finely setose but differs from the latter by having: 1) Vein cu-a of fore wing interstitial (Fig.) (vs cu-a postfurcal and nearly as long as vein 1-CU 1 in S. uncifera ); 2) First flagellomere 1.2 × longer than second (vs 1.8 × in S. uncifera ); 3) First tergite elongate 2.1 × (vs 1.7 × in S. uncifera ) longer than its apical width, and 3.0 × (vs 3.4 × in S. uncifera ) longer than its minimum width. Differences between S. (E.) neutra , sp. nov. and S. parucifera , sp. nov. are given in the key.

Description. Holotype, ♀, length of body 4.1 mm, fore wing 3.5 mm, ovipositor 0.6 mm ( Fig. 9 View FIGURE 9 ).

Head. Antenna with 24 antennomeres; length of scapus (without baso-ventral pointed horn) 7.3 × its maximum width, with tooth-shaped horn in basal 0.5 of scapus ( Fig. 10I View FIGURE 10 ); scapus 2.2 × of head height; first flagellomere 1.2 × second flagellomere; second-seventh flagellomeres serrate ventrally ( Fig. 10H View FIGURE 10 ); length from eighth flagellomere to apex of antenna equal to scapus; in dorsal view, occipital carina incomplete medio-dorsally ( Fig. 10A View FIGURE 10 ), width of head 1.6 × its median length, and 1.5 × width of mesoscutum (without tegulae); temple roundly narrowed behind eye; length of eye 1.8 × as long as temple; ocelli small, POL: OD: OOL = 5: 4: 11 ( Fig. 10A View FIGURE 10 ); eye 2.1 × as high as broad; in lateral view, transverse diameter of eye 1.3 × length of temple; in frontal view, diameter of antennal socket 1.6 × distance between sockets, face width 0.9 × length of face and clypeus combined, and 1.35 × height of eye; clypeus margin straight; malar space 0.85 × as long as basal width of mandible, and 0.3 × as long as eye height; distance between tentorial pits 1.25 × distance from pit to eye margin; face finely rugo-punctate; clypeus with dense fine punctures ( Fig. 10B View FIGURE 10 ); frons flat, with sparse striate rugosities direct to antennal sockets; temple and vertex polished smooth ( Figs 10A, C View FIGURE 10 ).

Mesosoma. In lateral view, length of mesosoma 1.7 × as long as its height; notauli deep, sparsely crenulated, divided posteriorly by median carina ( Fig. 10D View FIGURE 10 ); prescutellar sulcus deep and wide, 0.8 × as long as scutellum, with one carina ( Fig. 10D View FIGURE 10 ); mesoscutum and scutellum shiny, smooth; pronotal side wide, sparsely crenulated anteriorly and posteriorly, smooth medially ( Fig. 10E View FIGURE 10 ); precoxal sulcus long, crenulated; mesopleuron smooth; metapleuron with sparse rugosities; propodeum with short basal carina, coriaceous antero-laterally; with sinuate transverse rugosities medially, transversely rugose posteriorly ( Fig. 10F View FIGURE 10 ).

Wings. Length of fore wing 2.7 × its width; length of pterostigma 3.5 × its width, 1.4 × vein 1-R1 ( Fig. 10J View FIGURE 10 ); vein r arising behind middle of pterostigma, 0.4 × as long as width of pterostigma, r: 2-SR = 4: 14; and 0.2 × vein 1-R1; vein 1-CU1 thick, square ( Fig. 10J View FIGURE 10 ); cu-a: 2-CU1 = 5: 15; vein cu-a of fore wing nearly interstitial; hind wing; 1-M: 1r-m: 2-SC+R = 4: 8: 8.

Legs. Length of hind femur, tibia and basitarsus 8.2, 14.5 and 11.5 × as long as their maximum width, respectively; hind basitarsus 0.4 × hind tibia, and 0.9 × second-fifth tarsus combined; fourth hind tarsus 0.8 × as long as fifth tarsus (without pretarsus).

Metasoma. Length of first tergite 2.1 × its apical width, apical width of first tergite 3.0 × its minimum width; ovipositor sheath 0.1 × fore wing, and 0.55 × first tergite; ovipositor flat, weakly curved upwards; first metasomal tergite smooth in 0.7 basal of the tergite; first tergite with sparse striae laterally, and dorsal carinae narrowly parallelsided, extending to rugo-punctate area medio-posteriorly, smooth at extreme apex ( Fig. 10G View FIGURE 10 ); the remaining tergites highly smooth.

Colour. Head and mesosoma yellow; eyes silver-grey; stemmaticum black; legs and metasoma pale yellow, except first metasomal tergite pale brown basally, yellow apically; ovipositor sheath brown; pterostigma yellow but pale brown ventrally; wing veins yellow; wing membrane hyaline.

Male. Unknown.

Host. Unknown.

Etymology. “ par ” (Latin for “equal, like”), because the new species is relatively close to S. (E.) uncifera , from China.

Distribution. NE Vietnam: Lang Son province (Huu Lien NR) ( Fig. 21 View FIGURE 21 ).