Subprotelater lambirensis Arimoto & Kaliang & Mizuno & Meleng & Kishimoto-Yamada & Itioka 2025, sp. nov.

Subprotelater lambirensis Arimoto, sp. nov. (Figures 1–3) Type material. Holotype. Male (AA2737), Malaysia, Sarawak, Miri, Lambir Hills National Park, 22 IX 2010, Keiko Kishimoto-Yamada and Takao Itioka leg., by FIT in the canopy. Male. Diagnosis. This species is characterized by the following features: punctures small; interspaces between punctures generally larger than puncture diameter; body black; elytron with four sub-circular yellow spots; antennomeres I and II dark red; antennomeres III –IX black; legs dark red but coxae and femurs black tinged with red; setae yellow brown; pronotum 1.2 × longer than wide; prosternal process 1.8 × longer than procoxal cavity length in ventral view; mesal posterior angle of hypomeron strongly protruding; posterior part of scutellar shield not visible in lateral view; elytron 4.8 × longer than wide, 2.0 × longer than pronotal length; metepisternum narrower than width of elytral epipleuron; basal struts 0.15 × total length of median lobe; apices of parameres roundly truncate. Measurements. BL: 4.52, BW: 1.25, MAE: 0.78, MBE: 0.53, OI: 146, PL: 1.48, PML: 1.31, PW: 1.23, PAW: 0.79, PLI: 120, PWI: 156, EL: 2.92, EW: 0.61, EI: 479, BI: 198. Description. Body (Fig. 1) elongate; surface generally smooth, shining, but rough on depression of hypomeron for reception of pro-femur and tibia; punctures small; depressions of hypomeron for reception of proleg and of mesepimeron and metasternum for reception of midleg without punctures; interspaces between punctures generally larger than puncture diameter. Color. Body black. Elytron with four sub-circular yellow spots, of which one spot medially on humerus, two spots side-by-side on anterior 1/3, and one spot medially on posterior 1/3. Pronotal posterior lateral apices, posterior external edge of antennal groove of hypomeron, apical part of prosternal process, distal edge of elytron, posterior margins of metasternum and metacoxal plates and posterior part of abdomen tinged with red. Mouthparts yellowish with labrum and mandibles dark red; antennomeres I and II dark red; III–IX black; legs dark red but coxae and femurs black tinged with red. Body covered with yellow brown setae (Fig. 1A, B). Head. Frontal margin broadly rounded in dorsal view (Fig. 2A); frons distinctly depressed mesally and longitudinally (Fig. 2A, B); supra-antennal carina absent (Fig. 2B, C); frontoclypeal region most protruding between antennal sockets (Fig. 2D), grooved between eyes and mandibles (Fig. 2C); the grooves receive basal two antennomeres, opened posteriorly. Eyes 0.15 × longer than interocular distance in dorsal view. Mouthparts directed ventrally (Fig. 2D). Labrum semioval (Fig. 2E), 0.5 × longer than wide. Antennae extended beyond half-length of pronotum and not reaching pronotal posterior lateral apices by antennomere XI (Fig. 1A); relative antennomere lengths: II<III<IV–X<XI<I (Fig. 2F); antennomere I elongate and curved cylindrical; II short cylindrical, 0.9 × longer than wide; III trapezoidal, 1.2 × longer than wide, 1.9 × longer than II; IV–X parallelogram, weakly rounded distally, 1.1–1.2 × longer than wide; IV 1.2 × longer than III, 0.8 × longer than II–III combined; V 0.95 × longer than IV; XI bullet shaped, 1.8 × longer than wide, 1.45 × longer than X; each antennomeres with a longitudinal carina distally; the carinae on VIII–X not reaching their anterior edge, and carina on XI short. Mandibles unidentate (Fig. 2G); penicillus short, formed by brush of short setae; dorsal sinuous carina developed; with setae of various lengths on outside of the carina; outside concave basally (Fig. 2C). Maxilla (Fig. 2H): cardo constricted posteriorly; basistipe triangular; mediostipe bullet-shaped; galea short, brush-like; lacinia short, brush-like; palpomeres short and broad; palpomeres II–III shorter than wide; palpomere IV fusiform, 1.4 × longer than wide. Labium (Fig. 2I): mentum wide trapezoidal, with long setae; prementum with cluster of short setae medially; apical palpomere cylindrical. Prothorax widened posteriad but almost parallel-sided on posterior half, widest on posterior 1/5, and then weakly narrowed ahead of posterior angles (Fig. 1A). Antennal grooves between pronotum and hypomeron deep and opened anteriorly, not reaching posterior lateral apices of prothorax, visible in lateral view (Fig. 2D); sides of antennal grooves carinate. Pronotum sub-hexagonal, 1.2 × longer than wide, roundly convex, tallest posterior to the center (Fig. 2D), with median longitudinal depression posteriorly; each lateral carina extending from posterior angles along antennal grooves (Fig. 2D: black arrow), not reaching anterior angles; anterior angles obtuse (Fig. 2A); anterior edge straight in dorsal view (Fig. 2A); posterior angles extending posteriad, moderately broad, unicarinate; posterior edge without sublateral incision near each hind angle, lobated and protruding medially. Hypomeron depressed for reception of pro-femur and tibia, carinate behind the depression; anterior angle sharply pointed (Fig. 2J: white arrow); posterior edge broadly rounded mesally and weakly emarginate near distal posterior angle; mesal posterior angle strongly and sharply protruding (Fig. 2J: black arrow). Pronotosternal sutures (Fig. 1B) deeply grooved to receive pro-tarsi; tarsal groove opened posteriorly and connected to hypomeron depression for reception of pro-femur and tibia (Fig. 2J), becoming shallower anteriad, not reaching anterior edges of hypomeron and prosternum. Prosternum: anterior edge carinate, roundly projecting medially, depressed posterior to prosternal lobe; prosternal lobe short, not reaching the level of anterior edge of prothorax (Fig. 2D). Prosternal process 1.8 × longer than procoxal cavity length, depressed between procoxae, strongly curved dorsad behind procoxae (Fig. 2D); dorsal margin broadly rounded but with shallow concave medially in lateral view (Fig. 2D); ventral lobe almost parallel sided and gradually narrowed near apex in ventral view, with median longitudinal carina on posterior 1/3 (Fig. 1C); the carina forming pointed subapical tooth (Fig. 2D: white arrow); ventral margin rounded inward anteriorly and straight posteriorly in lateral view (Fig. 2D); ventral apex reaching dorsal apex; apex rounded in ventral and lateral views (Figs. 1C, 2D). Scutellar shield strongly inclined anterior-downwards (Fig. 1A), tongue-shaped in anterodorsal view (Fig. 2K), narrowed posteriad but almost parallel-sided around its half-length, 1.1 × longer than wide, convex (Fig. 2L); anterior part protruding anteriad (Figs. 1A, 2L); posterior part not visible in lateral view (Fig. 2D); anterior angles rounded; anterior edge straight; apex rounded. Mesosternum (Fig. 3A): anterior edge straight but sinuate laterally, lobate on each side; mesosternal cavity floor without median band of setae; mesosternal cavity almost parallel-sided in ventral view; borders of mesosternal cavity in lateral view rounded anteriorly, straight medially and then curved ventrad obtusely (Fig. 2D); mesosternal process between mesocoxae lower than mesocoxae, not visible in lateral view (Fig. 2D); posterior edge 0.2 × wider than total width of mesosternum, almost straight (Fig. 3A); mesosternum and metasternum connate medially (Fig. 2J). Mesepisternum excavate anteriorly (Fig. 2J). Mesepimeron depressed for reception of mid-femur (Fig. 2J). Mesocoxal cavity closed to mesepisternum by mesosternum and mesepimeron (Fig. 2J). Elytron 4.8 × longer than wide, 2.0 × longer than pronotal length, parallel-sided but narrowed from posterior 1/2, rounded apically, broadly convex but plane medially (Fig. 1C), with striae. Elytral apices not meeting at midline (Fig. 1A). Hind wings (Fig. 3B) fully developed, without veins CuA 1 and CuA 3+4; RA 3+4 vestigial (Fig. 3B: white arrow); r4 translucent; mediomedial-cross vein between MP 1+2 and MP 3+4 translucent (Fig. 3B: black arrow); mediocubital cross-vein between MP 3+4 and CuA 2 absent (Fig. 3B: grey arrow); AA3 vestigial; radial cell 4.0 × longer than wide. Metepisternum narrower than width of elytral epipleuron (Fig. 2J). Metasternum depressed for reception of mid-tibia and tarsi, carinate ahead of depression for reception of mid-tibia and ventrad of depression for reception of mid-tarsi (Fig. 2J: grey arrow), sulcate medially and ahead of metacoxal cavities (Fig. 1B). Metacoxal plate narrowed medially; lateral edge distinctly longer than width of metepisternum; lateral anterior angle rounded; lateral posterior angle broadly pointed (Fig. 3C: arrow). Tibiae with a pair of simple spurs (Fig. 3D: arrow); relative tarsomere lengths: IV<III<II<I<V (Fig. 3D); tarsi and claws simple. Abdomen. Ventrite V semicircular, broadly rounded apically (Fig. 1B), 0.55 × longer than wide. Tergites and sternites VIII‒X yellow. Tergite VIII (Fig. 3E) as long as wide, almost parallel-sided basally but weakly sinuate, broadly rounded apically. Sternite VIII (Fig. 3F) triangular, abruptly narrowed at its half-length, shorter than wide; apex rounded. Tergite IX (Fig. 3G) trapezoidal; anterior edge widely emarginate; median translucent area reaching tergite X. Tergite X (Fig. 3G) curved triangular, widely emarginate anteriorly, rounded apically, 1.2 × longer than wide, 0.45 × length of tergite IX. Sternite IX (Fig. 3H) elongate oval, widest at its half-length, broadly rounded apically. Aedeagus (Fig. 3I, J) yellow, elongate. Phallobase 0.3 × total length of aedeagus, 1.1 × longer than wide. Median lobe gradually tapering to apex, exceeding apices of parameres by its apex; basal struts 0.15 × total length of median lobe. Parameres separated ventrally; apical parts without lateral subapical barbs, roundly truncate apically, without setae (probably due to damage). Female. Unknown. Etymology. The specific epithet derives from Lambir Hills National Park, the type locality. Distribution. Malaysia (Borneo). Ecology. The life history and ecology of this species remain unknown, except that the hol