Diognetus schwartzi Kim & Jung 2026, sp. nov.

Diognetus schwartzi Kim & Jung sp. nov. Figs 6, 7 Material examined. Vietnam • Holotype. 1 ♂, Quang Ngai Prov., Dak Glei District, Dak Man (15°13'02.50"N, 107°44'04.65"E), 1071 m altitude, 15.iv.2025, J. Kim leg. (ZCDTU) (DTUHMM 0102). Diagnosis. Distinguished by the combination of the following characters: dorsum relatively uniformly colored in each part; clypeus mostly yellowish brown, except for brown longitudinal line; first segment pale brown, ventral margin and apical part tinged with red; second antennomere entirely pale brown, longer than pronotal maximum posterior width; third antennomere mostly pale brown with dark apical part; labium reaching hind coxa, but not exceeding; pronotum mostly dark brown, with indistinct darker markings, posterior margin paler; scutellum mostly brown, extreme apex paler; hind femur mostly pale brown, with dark ring and band subapically (Fig. 6); left paramere with long shaft, apex of shaft hook-shaped, outer margin of sensory lobe rounded; vesica with three sclerites; median sclerite straight, apex round, clearly shorter than lateral sclerite; lateral sclerite curved subapically, apically with acute process; third sclerite partly membranous with fine dentition at inner margin, with small triangular process (tp) apically (Fig. 7). Description. Male. Coloration: body mostly brown to dark brown, partially tinged with reddish. Head: mostly yellowish brown, with brown longitudinal line extending from vertex through frons to clypeus; carina brownish; vertex yellowish brown with brown markings; clypeus mostly yellowish brown, except for brown longitudinal line, tinged with red apically; mandibular plate yellowish brown, tinged with red; maxillary plate mostly pale brown; antenna mostly pale brown; first segment pale brown, ventral margin and apical part tinged with red; second segment entirely pale brown; third segment mostly pale brown, with dark apical part; fourth segment missing; labium partially pale to dark brown; first segment pale brown with darker line laterally and with dark part apically; apical part of fourth segment dark brown. Thorax: pronotum mostly dark brown, with indistinct darker markings, posterior margin paler; propleuron, mesepisternum, mesepimeron and metepimeron mostly dark brown, outer margin paler; scent efferent system entirely pale brown; scutellum mostly brown, extreme apex paler; hemelytron generally brown with reddish areas and darker markings; clavus mostly brown, subapical part paler; corium brown with darker marking medially and posteriorly, outer area tinged with red; embolium mostly reddish brown, darker posteriorly and along submarginal vein; cuneus mostly reddish brown, except for extreme pale apex, inner area darker; legs generally pale brown with dark markings and bands; coxae and trochanters entirely pale brown; fore and mid femora generally pale brown, with dark ring and marking apically; hind femur mostly pale brown, with dark ring and band subapically; tibia mostly pale, with longitudinal stripe along inner margin basally; tarsi entirely pale brown. Abdomen: pale ventrally, dark brown laterally, with brownish pygophore. Surface and vestiture: body generally shiny, partly strongly shining, punctate, partly strongly punctate, densely covered with two types of setae; one long and erect, varying from brown to yellowish, one short and recumbent, silvery; antenna densely setose, subequal to antennal diameter; pronotum strongly shiny and deeply punctate; scutellum and hemelytron distinctly punctate, but less strongly punctate than pronotum; legs densely setose, setae variable in length, some longer than tibial diameter. Structure: body elongate-oval, length ~ 5 mm. Head: weakly prognathous, 2.60 × as wide as long; vertex 0.57 × as wide as single compound eye width; antenna generally linear and cylindrical, almost same in thickness in each segment; first segment thicker than second segment, 1.93 × as long as vertex width, 0.25 × as long as second segment; second segment 2.11 × as long as third segment; proportion of antennomeres I – IV 0.52: 2.09: 0.99: [missing]; labium reaching hind coxa. Thorax: pronotum trapezoid, elevated laterally, dorsal longitudinal length 1.46 × as long as anterior maximal width, 0.47 × as long as posterior maximal width, lateral margin straight, posterior margin broadly convex, weakly depressed medially; callus weakly swollen; pronotal collar broad, broader than first antennomere maximal diameter; scutellum flat, width subequal to length, length longer than claval commissure length; exposed part of mesoscutum narrow; lateral margin of hemelytron rounded; cuneal outer margin 0.34 × as long as embolial margin; fore leg with second tarsomere short; hind leg with first tarsomere short, third tarsomere longest. Abdomen: tapering to apex, almost reaching apex of cuneus. Genitalia: left paramere strongly curved, shaft long, apex of shaft curved, hook-shaped, sensory lobe well developed, rounded (Fig. 7 A – C); right paramere long, stout, weakly curved, shaft long, apex of shaft curved (Fig. 7 D – F); vesica membranous with three sclerites; median sclerite (ms) straight, apex round; lateral sclerite (ls) distinctly longer than ms, curved subapically, apically with acute process; third sclerite (ts) partly membranous, inner margin finely dentate, with small triangular process (tp) apically (Fig. 7 G – J). Female: Unknown. Measurements (in mm). Male (n = 1) Body length, clypeus – apex of membrane: 5.07; head length, excluding collar: 0.47; head width across eyes: 1.22; vertex width: 0.27; length of 1 st antennomere: 0.52; 2 nd: 2.09; 3 rd: 0.99; 4 th: missing; mesal pronotal length: 0.89; pronotal maximal width: 1.91; scutellar width: 1.01; mesal scutellar length: 0.96; claval commissure length: 0.90; maximal width across hemelytron: 1.12: length of hind leg (femur: tibia: tarsus): 1.58: 2.47: 0.66. Etymology. The specific name honors Dr Michael D. Schwartz, an eminent specialist in the taxonomy of Miridae, in acknowledgement of his significant contributions to the understanding of this family, particularly in the Oriental Region, including his studies on the genus Diognetus. The name is formed as a noun in the genitive case. Plant association. This species was collected from an unidentified broad-leaved tree. Distribution. Vietnam (Central highlands). Remarks. According to the key provided by Yasunaga et al. (2023), species of Diognetus are characterized by the rounded sensory lobe of the left paramere. Diognetus schwartzi sp. nov. can be distinguished from most other species of the genus by this character, which constitutes an important diagnostic feature in the key. In addition, the third sclerite, which is partially membranous and distinctly dentate, further separates this species from most congeners. This new species is similar in appearance to D. vernus Yasunaga, Schwartz & Chérot, 2023, but can be distinguished by third antennomere mostly pale brown with the apical part dark (vs dark brown); the sensory lobe of the left paramere rounded (vs relatively angular); and the lateral sclerite distinctly longer than the median sclerite and curved subapically (vs the lateral sclerite slightly longer than the median sclerite and almost straight). Furthermore, although externally similar to D. puspae Yasunaga et al., 2023, it can be readily distinguished by the second antennomere entirely pale brown (vs the second antennomere with dark apical part), the sensory lobe of left paramere broad (vs the sensory lobe relatively narrow), and by differences in the overall morphology of the vesical sclerites. This new species is also similar in dorsal habitus and the vesical structure to D. intonsus Distant, 1904, but it can be separated by the overall shape of the left paramere (see Yasunaga et al. 2023: fig. 15 F, G). Based on the structure of the third vesical sclerite, this new species is similar to D. laureus Yasunaga et al., 2023, but can be distinguished by the labium reaching the hind coxa (vs labium reaching abdominal sternum) and by the median sclerite being clearly shorter than the lateral sclerite (vs median sclerite subequal to the lateral sclerite in length).