Euphorbialygus kontumensis Kim & Jung 2026, sp. nov.

Euphorbialygus kontumensis Kim & Jung sp. nov. Figs 8, 9 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 0103). Diagnosis. Distinguished by the following combination of characters: dorsum mostly unicolorous, partly tinged with reddish; first antennomere almost unicolorous; scutellum unicolorous; cuneus orange-brown tinged with reddish (Fig. 8) and male genitalia characters with lateral sclerite weakly curved subapically and fourth sclerite similar in length to median and lateral sclerites in aedeagus (Fig. 9 F, G). Description. Male. Coloration: body generally orange-brown, partially tinged with reddish. Head: vertex and frons entirely orange-brown; clypeus entirely dark brown; mandibular plate somewhat paler; maxillary plate entirely orange-brown; suture between mandibular and maxillary plates tinged with red; antenna brown to dark brown; first segment mostly brown, apically tinged with reddish; second segment mostly brown, 1 / 4–1 / 3 apical part dark brown; third and fourth segments entirely dark brown, except for pale extreme base of third segment; labium mostly orange-brown; apical parts of first and fourth segments dark brown. Thorax: pronotum entirely orange-brown; propleuron mostly orange-brown, outer margin paler; mesepisternum brown, darker near mesepimeron; mesepimeron mostly dark brown, posterior margin near metepimeron pale; metepimeron entirely dark brown; scent efferent system mostly whitish pale brown, near metepimeron darker; scutellum entirely brown; hemelytron mostly orange-brown to brown with dark markings, partially tinged with reddish; clavus entirely brown; corium entirely brown, with small dark marking at inner area, posterior part tinged with reddish; embolium entirely orange-brown; cuneus mostly orange-brown, tinged with reddish anterior and inner margins; membrane grayish, inner area with narrow and tapering dark stripe, with small dark spot on apical part of large cell, with U-shaped darker marking along posterior margin; legs mostly orange brown; all femora mostly orange-brown with dark narrow ring at apex; hind femur apically tinged with reddish; all tibiae mostly orange-brown, tinged with reddish basally, with dark narrow ring at extreme apex; all tarsi mostly brown, apical part of third tarsomere dark brown. Abdomen: mostly pale brown, with small reddish spots in row laterally. Surface and vestiture: body generally weakly shiny, weakly and shallowly punctate, densely covered with two types of setae; one pale simple setae, one silvery recumbent setae; antenna densely setose, very short; pronotum shiny, covered with pale simple setae; scutellum weakly shiny, with silvery recumbent setae along margins; hemelytron densely covered with silvery recumbent setae, with simple and erect setae partly present; legs densely covered with very short, suberect setae. Structure: body elongate-oval, length ~ 3.7 mm. Head: weakly prognathous, strongly transverse, 4.55 × as wide as long; vertex 0.61 × as wide as single compound eye width; antenna linear and cylindrical, almost same in thickness in each segment; first segment weakly thicker than second segment, 2.43 × as long as vertex width, 0.36 × as long as second segment; second segment 2.11 × subequal to combined third and fourth segments; proportion of antennomeres I – IV 0.56: 1.55: 0.83: 0.64; labium reaching hind coxa. Thorax: pronotum trapezoid, dorsal longitudinal length 1.55 × as long as anterior maximal width, 0.57 × as long as posterior maximal width, lateral margin straight, posterior margin round; callus weakly swollen; pronotal collar thin, as thin as third or fourth antennomere maximal diameter; scutellum flat, width longer than length, length shorter than claval commissure length; exposed part of mesoscutum narrow; lateral margin of hemelytron weakly rounded; cuneal outer margin 0.32 × as long as embolial margin; fore leg with second tarsomere short, first tarsomere subequal to third tarsomere; mid and hind legs 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 with hook-shaped, sensory lobe weakly developed, inner margin angled (Fig. 9 A – C); right paramere rod-shaped and stout, shaft curved and tapered apically (Fig. 9 D, E); vesica membranous with four sclerites; median sclerite (ms) long and weakly curved subapically; lateral sclerite (ls) long and weakly curved subapically, similar to ms in length, tapered to apex; third sclerite (ts) thin, tapered to apex, ~ 0.67 × as long as ls; fourth sclerite (fs) flagellate, slightly longer than ms and ls (Fig. 9 F, G). Female: unknown. Measurements (in mm). Male (n = 1) Body length, clypeus – apex of membrane: 3.76; head length, excluding collar: 0.22; head width across eyes: 1.00; vertex width: 0.23; length of 1 st antennomere: 0.56; 2 nd: 1.55; 3 rd: 0.83; 4 th: 0.64; mesal pronotal length: 0.82; pronotal maximal width: 1.44; scutellar width: 0.78; mesal scutellar length: 0.67; claval commissure length: 0.77; maximal width across hemelytron: 0.83: length of hind leg (femur: tibia: tarsus): 1.35: 2.24: 0.52. Etymology. The specific name refers to Kon Tum, the former province in which the type locality was situated at the time of collection, retaining the historical locality name; the name is treated as an adjective. Plant association. This new species was collected from the unidentified broad-leaved tree, the same tree from where Diognetus schwartzi sp. nov. was collected. Distribution. Vietnam (Central highlands). Remarks. Euphorbialygus kontumensis sp. nov. is similar to E. nanglong Yasunaga, 2024, one of the two species currently known, but can be distinguished by the following characters: the first antennomere almost unicolorous (vs the first segment clearly not unicolorous, the base of first segment dark brown); the scutellum unicolorous (vs the scutellum with a pair of dark spots); the cuneus mostly orange-brown (vs the cuneus brown with distinct dark marking); and the fourth sclerite similar in length to the median and the lateral sclerites (vs the fourth sclerite [flagellate lobal sclerite in Yasunaga 2024] clearly longer than the median and the lateral sclerites [two vesical spicules in Yasunaga 2024]). This new species can also be distinguished from E. rufobrunneus Yasunaga, 2024, by the following characters: the first antennomere almost unicolorous (vs the first segment clearly not unicolorous, the base of first segment dark brown); the cuneus mostly orange-brown (vs the cuneus brown with distinct dark marking); and the lateral sclerite weakly curved subapically (vs the lateral sclerite [vesical spicule in Yasunaga 2024] thick and strongly curved).