Cisaris tergalis Pham & Cao, 2025

Cisaris tergalis Pham & Cao , sp. nov.

( Figures 7 View FIGURE 7 , 8 View FIGURE 8 )

Material examined. Holotype: ♀ ( IEBR), Son La Province, Son La, Quyet Tam, 5–15.v.2014, Malaise trap, Long D.K. coll. ; Paratypes: 6♀ (IB), Lam Dong Province, Bidoup-Nui Ba National Park , 12°1047.34”N 108°41’45.9”E, 1,477 m a.s.l., viii–x.2017, Malaise trap, Pham T.N. leg .; 1♀ (IB), Lang Son Province, Trang Dinh district, Chi Minh commune, 22°21’34”N 106°24’47”E, 350 m a.s.l., 29.iv–5.v.2025, Malaise trap, Pham T.N., Cao T.Q.N., Cao, T.K. T., Dang T.H and Nguyen D.H leg. GoogleMaps

Diagnosis. Antenna without white flagellomeres; scutellum sub-polished, with sparse punctures, lateral carina present basally; propodeum with moderately dense punctures, area superomedia separated from area basalis; metasomal tergites 2 and 3 almost fused together dorsally; ovipositor sheath 1.0–1.2× as long as hind tibia.

Description of holotype. Face 0.5× as high as wide, rugose punctate ( Fig. 7B View FIGURE 7 ). Clypeal suture distinct. Clypeus 2.8× as wide as high, sub-polished with large punctures, subapical margin impressed ( Fig. 7B View FIGURE 7 ). Mandible long, upper tooth sharp, 3.0× as long as lower tooth. Malar space matt, densely punctate, as wide as basal width of mandible ( Fig. 7B View FIGURE 7 ). Gena wider than compound eye in lateral view, sub-polished, with moderately dense punctures (7D). Frons and vertex rugose punctate. Postero-ocellar distance 0.9× as long as ocular-ocellar distance, 1.3× median ocellus diameter ( Fig. 7C View FIGURE 7 ). Antenna with 17 flagellomeres, slightly thickened toward apex, F1 2.2× as long as wide, 1.0× as long as F2. Occipital carina complete, ventrally curved before meeting hypostomal carina above base of mandible.

Mesosoma.Pronotum rugose punctate,except narrow impunctate dorsally.Epomia present( Fig.8A View FIGURE 8 ).Mesoscutum 0.7× as long as its maximum width, sub-polished, with large punctures laterally and rugose punctures medio-posteriorly. Notaulus distinct anteriorly. Scutellum moderately convex, sub-polished, with sparse punctures, lateral carina present basally ( Fig. 8B View FIGURE 8 ). Mesopleuron extremely rough, with dense, irregular wrinkles and coarse punctures; epicnemial carina with upper end reaching to subalar prominence. Sternaulus strong anteriorly, posteriorly weaker, reaching hind margin of mesopleuron, distinctly dorsad of lower posterior corner of mesopleuron. Metapleuron with reticular wrinkles ( Fig. 8A View FIGURE 8 ). Propodeum with moderately dense punctures, carinae strong. Area superomedia sub-polished with sparse punctures. Area basalis smooth, without punctures except punctate along surrounding carinae. Area dentipara densely punctate. Apico-median portion from posterior margin of area superomedial to apex of posterior corner of area petiolaris strongly concave longitudinally ( Fig. 8D View FIGURE 8 ). Propodeal apophysis strong and compressed. Propodeal spiracle small, round.

Wings. Fore wing length ca. 2.9 mm, vein 1cu-a slightly postfurcal to M&RS, inclivous, ventrally curved, vein 3rs-m absent, vein 2rs-m shorter than length of M between 2rs-m and 2m-cu, length of CU between 1m-cu&M and 2cu-a 2.5× length of 2cu-a ( Fig. 8E View FIGURE 8 ). Hind wing with distal abscissa of CU present, length of CU between M and cu-a 2.5× length of cu-a.

Legs. Hind coxa densely coarsely punctate, except concave area dorsally smooth. Hind femur sub-polished with moderately dense punctures, 3.9× as long as its maximum width, 0.8× as long as hind tibia length. Hind tibia coarsely sculptured, 1.1× as long as hind tarsus. Hind basitarsus 0.4× as long as tarsus.

Metasoma.Tergites smooth and shining, with scattered, small punctures. T1 2.5× as long as apical width, median dorsal carina weak, present medially, dorsolateral carina complete, ventrolateral carina present, weak anteriorly; spiracle small, round. T2 and T3 almost fused together dorsally ( Fig. 8F View FIGURE 8 ). Laterotergite of T2 2.1× as long as apical width ( Fig. 8C View FIGURE 8 ). Ovipositor straight ( Fig. 7A View FIGURE 7 ). Ovipositor sheath 1.1× as long as hind tibia.

Colour. Black with reddish brown. Head black, antenna reddish, dorsal side of apical flagellomeres reddish brown, palpi yellow. Metasomal tergites from base to apex reddish brown to reddish. Ovipositor reddish. Ovipositor sheath reddish brown. Fore and mid legs reddish. Hind leg with coxa to femur reddish brown, tibia to tarsus reddish. Wings hyaline, wing veins blackish brown.

Variation. Paratypes have fore wing length 2.5–2.9 mm, malar space 1.0–1.2× as long as basal mandible width, T1 2.4–2.6× as long as apical width, laterotergite of T2 1.9–2.4×, ovipositor sheath 1.0–1.2× hind tibia length. The paratype from Lang Son Province has its F1 1.2× as long F2.

Male. Unknown.

Comparative notes. This new species resembles C. rugosus sp. nov. by having its T2 and T3 almost fused together dorsally but differs from the latter by having T4 onwards mostly exposed (vs. retracted under tergite 3) and punctate area dentipara (vs. densely wrinkled).

Etymology. The specific name refers to its characteristic of metasomal tergites 2–3.

Distribution. Currently known from Son La and Lang Son provinces, northern Vietnam and Lam Dong Province, the Central Highlands.