Adelphocorisella tamdaoensis Cherot & Kim 2025, sp. nov.

Adelphocorisella tamdaoensis Chérot & Kim, sp. nov. (Fig. 1A–E) Diagnosis. Recognized by the dorsum mostly pale brown with dark and reddish parts, densely covered with silvery and dark setae; antennae shorter than body; second antennal segment length subequal to third segment; head relatively large; eye width more than 1/2 vertex width in male; hemelytra mostly dark reddish brown with reddish spots; inner part of cuneus with reddish markings, its apex dark brown; tibia entirely yellowish to pale brown, without dark basal spots; left paramere with an elongate hypophysis; right paramere short, glabrous, with a hooked hypophysis; endosoma with one elongate and curved sclerite (Fig. 1E). Description. MALE: Body elongated-oval, length 4.75, mostly yellowish to pale brown with partly dark and reddish areas. Coloration: Head: Mostly yellowish brown; antennae mostly yellowish; first segments reddishbrown; base of second segment tinged with red; labium dark, tip almost black. Thorax: Pronotum dark brown, paler basally; scutellum brown, apex and midline whitish; hemelytra brown, basal parts of clavus and corium darker; embolium with numerous red spots; cuneus yellowish brown, with numerous red spots anteriorly and black apex, inner part with red markings; membrane dark brown; legs mostly yellowish brown with red spots; hind femora darker; tibial spine pale yellow. Abdomen: Mostly yellowish-brown with red markings anteriorly. Surface and vestiture: Dorsum sub-shining, covered with dark brown to black setae and denser recumbent silvery setae; first antennal segment with small dark brown setae; pronotum weakly punctate, bearing pronounced pair of stiff setae on anterior corners; scutellum weakly punctate. Structure: Head: Pointed in front; vertex width shorter than single compound eye width; antennae linear, shorter than body length; first segment thickest, longer than head length in dorsal view, shorter than head width; second segment subequal to third segment; proportion of first to fourth antennal segments 0.7: 2.0: 2.0: 0.75; labium extending beyond hind coxae. Thorax: Pronotum trapezoid, longitudinal length more than 1/2 basal maximal width, posterior margin slightly rounded; calli slightly swollen; pronotal collar medial length shorter than first antennal segment diameter; scutellum weakly elevate, longitudinal length subequal to pronotum longitudinal length; lateral margin of hemelytra almost straight; cuneus triangular, elongate, anterior width shorter than cuneal length. Abdomen: Rounded, not reaching to apex of cuneus. Genitalia: Pygophore with digitiform extension on left side of opening; left paramere with elongate hypophysis (Fig. 1C); right paramere short, glabrous, with hooked hypophysis (Fig. 1D); endosoma including elongated sclerite apically curved (Fig. 1E); secondary gonopore and ductus seminis relatively large. FEMALE: Unknown. Measurements (in mm). Male (n=1). Body length, clypeus–apex of membrane: 4.75; head length, excluding collar: 0.40; head width, including compound eyes: 1.07; vertex width: 0.35; 1 st antennal segment length: 0.7; 2 nd antennal segment length: 2.0; 3 rd antennal segment length: 2.0; 4 th antennal segment length: 0.75; total antennal length: 4.2; mesial pronotal length: 0.9; posterior pronotal maximal width (straight): 1.55; anterior scutellar width: 0.85; mesial scutellar length: 0.95; commissure length: 1.13; maximal width across hemelytron: 0.85. Biology. Unknown. Distribution. Vietnam. Etymology. Named after the type locality, Tam Dao where the specimen was collected, and the Latin suffix - ensis, meaning ‘belonging to’ or ‘originating from’. Specimen examined. [ISNB] Holotype: 1♂, Tam Dao National Park, Vinh Phuc Province, Vietnam, 25– 28.viii.2010, J. Constant & P. Limbourg leg. (FC n° 11064). Discussion. This new species is closely related to A. australis Malipatil & Chérot, 2002 based on similarities of the habitus and the endosomal structure, particularly the elongate sclerite that is pointed and bent apically. However, A. tamdaoensis sp. nov. differs from A. australis by the second antennal segment length being subequal to the third segment (vs. second antennal segment being longer than the third segment); cuneus with dark marking at apex (Fig. 1B) [vs. cuneus without dark marking at apex; see the original description and fig. 1 in Malipatil & Chérot (2002)]; the pygophore bearing a digitiform extension to the left of the opening [vs. pygophore without a digitiform extension at the opening; see Malipatil & Chérot (2002): 101, fig. 2] and by the more pronounced elongate hypophysis of left paramere [vs. short or not elongate hypophysis of left paramere; see Malipatil & Chérot (2002): 101, fig. 4]. Adelphocorisella tamdaoensis sp. nov. is easily distinguished from A. brunnescens (Poppius, 1915), A. relata (Distant, 1904) and A. rubricornis Chérot & Malipatil 2016 by the brownish dorsum with red and dark brown parts [vs. brownish dorsum without red part in A. brunnescens, mostly dark brownish dorsum without red part in A. relata, and mostly pale dorsum with red spot on scutellum and transverse red band posteriorly in A. rubricornis; see Chérot & Malipatil (2016): 158, figs. 4–6]. It also differs from A. brunnescens by the cuneus with numerous red spots (vs. cuneus brown with small dark spots), from A. relata by the mostly reddish first antennal segment (vs. brownish first antennal segment with apical red marking), and from A. rubricornis by the elongate hypophysis of left paramere [vs. short hypophysis of left paramere; see fig. 9 in Malipatil & Chérot (2016)]. The new species differs from A. insulana Miyamoto & Yasunaga, 1993 and A. lespedezae Miyamoto & Yasunaga, 1993 by the darker reddish dorsum (vs. pale and mottled brownish dorsum in A. insulana and mottled brownish dorsum with red spots in A. lespedezae); mostly reddish first antennal segment (vs. mostly pale first antennal segment in both species); cuneus with numerous red spots (vs. cuneus with few red spots in both species); the elongate and relatively thin left and right parameres [vs. relatively short and thick left and right parameres in both species (Fig. 1F–G)]; and the apically pointed and bent sclerite [vs. mostly straight sclerite in both species (Fig. 1H)]. Finally, Adelphocorisella tamdaoensis sp. nov. is distinguished from A.sarika Yasunaga et al. 2016 from Thailand by mostly reddish first antennal segment (vs. mostly pale first antennal segment); cuneus with numerous red spots (vs. cuneus with few red spots); and apically pointed and bent sclerite (vs. slightly curved sclerite subapically).