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

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

( Figs 104–108 View FIGURES 104–108 )

Type material. Holotype: CHINA (YUNNAN Prov.): ♂, two labels: “ China: Yunnan Prov. / Nabanhe N. R. / Benggangxinzhai / alt. 1750m, 03-V -2009 / Jia-Yao Hu & / Zi-Wei Yin leg.” [white, printed]; “ CEPHENNODES (s. str.) / biimpressus m. / P. Jałoszyński, 2025 / HOLOTYPUS ” [red, printed] ( SNUC) . Paratypes (12 exx.): 8 ♂♂, 2 ♀♀, same data as for holotype ; 2 ♂♂, same data except for 1900 m and 01-V-2009. Each paratype with yellow “ PARATYPUS ” label ( SNUC, cPJ) .

Diagnosis. Body large, BL around 1.6–1.7 mm; antennae gradually thickened; punctures on clypeus and frontovertexal region outside transverse impressions sharply marked and dense, separated by spaces narrower than their diameters, punctures on pronotum larger and deeper than those on head, also conspicuously dense, those on elytra contrastingly superficial; pronotal lateral carinae single; subhumeral lines short, as long as 0.3 × EL. Male: head modified ( Figs 105–106 View FIGURES 104–108 ), with pair of transverse impunctate and asetose impressions between antennal insertions, each with sharply marked ridge-like anterior margin, and posteriorly gradually becoming shallower; aedeagus ( Figs 107–108 View FIGURES 104–108 ) in ventral view strongly elongate, with distal margin of capsular region only slightly asymmetrical and not triangular.

Description. Body of male ( Fig. 104 View FIGURES 104–108 ) strongly convex, oval, with very shallow constriction between pronotum and elytra, dark brown with slightly lighter tarsi, covered with light brown setae. BL 1.63–1.73 mm.

Head ( Figs 105–106 View FIGURES 104–108 ) broadest across moderately large and moderately strongly convex, coarsely faceted eyes, HL 0.23–0.25 mm, HW 0.43 mm; frontovertexal region with pair of large transverse impunctate and asetose impressions between antennal insertions, each with sharply marked ridge-like anterior margin and connected at middle, posteriorly each impression gradually becoming shallower. Punctures on clypeus and frontovertexal region behind impressions conspicuously distinct, sharply marked and dense, punctures separated by spaces narrower than their diameters; setae on punctate areas moderately long, sparse, suberect. Antennae long and slender, gradually thickened, AnL 0.90–0.95 mm, antennomere 1 about as long as broad, 2 weakly elongate, 3 and 4 each about as long as broad, 5 and 6 each weakly elongate, 7 strongly elongate, 8–10 each indistinctly elongate, 11 as long as 9 and 10 combined, slightly more than twice as long as broad.

Pronotum semi-oval, moderately strongly convex at middle and flattened near hind corners, broadest near middle and weakly but distinctly narrowing posterad; PL 0.50–0.53 mm, PW 0.73–0.78 mm. Anterior margin in strictly dorsal view nearly straight; lateral margins strongly rounded in anterior half 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 much closer to posterior than to lateral pronotal margin. Punctures on median region of pronotal disc small but sharply marked and deep, separated by spaces slightly narrower than their diameters; punctures near anterior angles denser and coarse. Setae on pronotal disc long and moderately dense, suberect.

Elytra about as wide as pronotum, together oval, broadest near anterior third; EL 0.88–0.98 mm, EW 0.78–0.80 mm, EI 1.09–1.26; subhumeral lines developed as sharp borders between elevated humerus and lower mesal region, as long as about 0.3 × EL and distinctly divergent posterad; basal elytral fovea on each elytron almost equidistant from lateral margin of mesoscutellum and subhumeral line; elytral apices separately rounded. Punctures on elytra much shallower and slightly sparser than those on pronotum, superficial; setae distinctly longer than those on pronotum, dense and erect.

Hind wings functional.

Metaventrite lacking lateral impressions.

Legs long and slender, unmodified.

Aedeagus ( Figs 107–108 View FIGURES 104–108 ) of strongly modified simonis form, AeL 0.60 mm; capsular region of median lobe in ventral view strongly elongate and oval, with distal margin weakly asymmetrical and not triangular; dorsal apical projection (= distal plate) in ventral view slender, elongate and tapering distad, in lateral view hook-shaped, curved dorsad at nearly right angle; parameres long and slender, not reaching apex of aedeagus, each with one long apical and two similarly long subapical setae.

Female. Externally similar to male, except for unmodified head, and antennae slightly shorter in relation to BL; wings not studied; BL 1.65 mm; HL 0.25 mm, HW 0.44 mm, AnL 0.88 mm; PL 0.55 mm, PW 0.80 mm; EL 0.85 mm, EW 0.80 mm, EI 1.06.

Distribution. S China: Yunnan.

Etymology. The adjective biimpressus refers to a pair of frontal impressions in males.

Remarks. Cephennodes biimpressus can be easily identified by male head modifications: a pair of transverse impunctate and asetose impressions in front of eyes, with a sharply marked anterior margin developed as a biarcuate ridge, and posteriorly gradually becoming shallower. Moreover, the strongly elongate aedeagus with only weakly asymmetrical distal margin of the capsular region without a defined apex is also characteristic of this species.