Macrolycus quartus Y. Yang, Du & Liu, 2024

Macrolycus quartus Y. Yang, Du & Liu sp. nov.

Figs 5 A, B View Figure 5 , 6 A – C View Figure 6

Diagnosis.

The species resembles M. praecellens Kazantsev, 1993 , but can be distinguished from the latter by the following characters: lamellae of antennomeres III and IV obtuse at apices (Fig. 5 A View Figure 5 ); phallus integrally stout (Fig. 6 A – C View Figure 6 ), apical part relatively long and moderately expanded ventrally in lateral view (Fig. 6 C View Figure 6 ). In contrast, in M. praecellens , lamellae of antennomeres III and IV are acute at apices ( Kazantsev 1993: fig. 13); phallus is integrally slender, apical part is relatively short and strongly expanded ventrally in lateral view ( Kazantsev 1993: fig. 12).

Etymology.

The specific name is derived from the Latin quartus (the fourth), referring to its antennomere IV truncated at apex.

Type material.

Holotype. China: ♂ ( MHBU), Guangxi, Wuming, Damingshan , 1100 m, 27. v. 2011, leg. H. Y. Liu. Paratypes. 3 ♂ 9 ♀ ( MHBU), same data as the holotype ; 3 ♂ 7 ♀ ( MHBU), Guangxi, Wuming, Damingshan , 1230–1422 m, 20. v. 2011, leg. H. Y. Liu .

Description.

Male (Fig. 5 A View Figure 5 ). Length 9.4–10.6 mm (10.0 mm in holotype), width at humeri 1.9–2.3 mm ( 2.2 mm in holotype).

Body black. Pronotum, elytra and scutellum dark red. Surface covered with decumbent red pubescence (Fig. 5 A View Figure 5 ).

Eyes small, interocular distance about 2.3 times greater than eye diameter. Antennae flabellate, overlapping basal 2 / 3 length of elytra when inclined. Antennomere III triangular and obtuse apically, about 2.5 times longer than wide; IV – XI lamellate, lamella of IV apically obtuse and lamellae of V – XI pointed at apices; lamella of IX longest, 3.8 times longer than joint itself (Fig. 5 A View Figure 5 ).

Pronotum square, 1.1 times wider than long. Anterior margin projecting anteriad and feebly emarginate at apex, lateral margins sinuate and posterior margin bisinuate; anterior angles rounded, posterior angles sharp and sharply projected. Scutellum trapezoidal, feebly emarginate at apex (Fig. 5 A View Figure 5 ).

Elytra 3.8 times longer than humeral width. Costa I weak, II as strong as IV, and III weak and visible only at humeri (Fig. 5 A View Figure 5 ).

Phallus slender (Fig. 6 A – C View Figure 6 ), nearly parallel-sided basally in dorsal and ventral views (Fig. 6 A, B View Figure 6 ), subapical part moderately and asymmetrically inflated laterally, about 1.89 times as wide as basal part, with an oval ventral-cavity, apical part progressively expanded distad, apex with a shallow V-shaped notch, about 0.54 times as wide as subapical part; basal 1 / 3 part feebly curved ventrally in lateral view (Fig. 6 C View Figure 6 ), subapical part inflated ventrally, apical part moderately expanded ventrally, with a square lamella.

Female (Fig. 5 B View Figure 5 ). Similar to male, but larger in body size. Length 11.5–13.9 mm, width at humeri 2.7–3.3 mm. Antennae serrate and shorter, overlapping elytral mid-length when inclined. Pronotum 1.2 times wider than long, anterior angles obtuse-angled.

Distribution

(Fig. 2 View Figure 2 ). China ( Guangxi).