Cephennodes (s. str.) arcuatus, Jałoszyński, 2025

Cephennodes (s. str.) arcuatus sp. nov.

( Figs 185–188 View FIGURES 185–188 )

Type material. Holotype: CHINA ( YUNNAN Prov.): ♂, two labels: “CHINA: Yunnan, Dali Bai Aut. Pref., / mount. range E Weishan, 12 km NE / Weishan, 25º17’02-15’’N, 100º22’ / 23-30’’E, 2630-2660 m, scrub with / pines and bamboo, litter sifted, 15.IX. / 2009, leg. M. Schülke [ CH09-54 ]” [white, printed]; “ CEPHENNODES (s. str.) / arcuatus m. / P. Jałoszyński, 2025 / HOLOTYPUS ” [red, printed] ( MNB).

Diagnosis. Body small, BL around 1.15 mm; antennae gradually thickened; punctures on head, pronotum and elytra barely discernible, inconspicuous; subhumeral lines short, as long as 0.3 × EL. Male: subapical elytral region modified ( Fig. 186 View FIGURES 185–188 ), with cordiform flattening covered with flattened hyaline setae; aedeagus ( Figs 187–188 View FIGURES 185–188 ) in ventral view with capsular region of median lobe with elongate subtriangular distal portion rounded at apex and slender recurved distal projection with hook-like apex.

Description. Body of male ( Fig. 185 View FIGURES 185–188 ) moderately strongly convex, oval, with barely discernible constriction between pronotum and elytra, moderately light brown with slightly lighter tarsi, covered with light brown setae. BL 1.15 mm.

Head broadest across moderately large and moderately strongly convex, coarsely faceted eyes, HL 0.13 mm, HW 0.29 mm; frontovertexal region weakly convex at middle; supraantennal tubercles weakly elevated. Punctures fine, inconspicuous; setae short, sparse and suberect. Antennae long and slender, gradually thickened, AnL 0.60 mm, antennomere 1 about as long as broad, 2 strongly elongate, 3 about as long as broad, 4–6 each indistinctly elongate, 7 strongly elongate, 8 transverse, 9 and 10 each about as long as broad, 11 as long as 9 and 10 combined, about 1.6 × as long as broad.

Pronotum semi-oval, moderately strongly convex at middle and flattened near hind corners, broadest slightly behind middle and weakly narrowing posterad; PL 0.35 mm, PW 0.56 mm. Anterior margin in strictly dorsal view nearly straight; lateral margins strongly rounded in anterior third and weakly so posteriorly, finely microserrate, posterior corners nearly right-angled; posterior margin shallowly bisinuate; lateral marginal carinae simple ( i.e., not doubled); lateral antebasal pits shallow but distinct, each located slightly closer to posterior than to lateral pronotal margin. Punctures on pronotal disc fine and inconspicuous; setae short and moderately dense, suberect.

Elytra indistinctly wider than pronotum, together oval, broadest near anterior third; EL 0.68 mm, EW 0.58 mm, EI 1.17; subhumeral lines developed as sharp borders between elevated humerus and lower mesal region, as long as 0.3 × EL and distinctly divergent posterad; basal elytral fovea on each elytron slightly closer to lateral margin of mesoscutellum than to subhumeral line; elytral apices separately rounded; subapical elytral region modified ( Fig. 186 View FIGURES 185–188 ), with cordiform flattening covered with flattened hyaline setae. Punctures on elytra similar to those on pronotum; setae short, moderately dense and suberect.

Hind wings functional.

Metaventrite with lateral impressions about as long as half of its length.

Legs long and slender, unmodified.

Aedeagus ( Figs 187–188 View FIGURES 185–188 ) of modified simonis form, AeL 0.28 mm; in ventral view with capsular region of median lobe with elongate subtriangular distal portion rounded at apex and with slender recurved distal projection with hook-like apex; parameres of uneven lengths, each with one long apical and one similarly long subapical seta.

Female. Unknown.

Distribution. S China: Yunnan.

Etymology. The adjective arcuatus refers to the arcuate patch of modified setae on male elytra.

Remarks. Cephennodes arcuatus can be easily identified by the unique male elytral modification; also the aedeagus of this species is unusually shaped and not possible to be confused with genitalia of any other Cephennodes .