Macrolycus expansus Y. Yang, Liu & X. Yang sp. nov. Figs 3 B, 4 D – F Diagnosis. The species resembles M. guangxiensis Li, Bocak & Pang, 2015 in the general shape of the phallus, but differs in the longer lamella of male antennomere III, 0.9 times as long as the joint itself (Fig. 3 B); phallus with subapical part strongly inflated laterally in ventral view (Fig. 4 E), apical part strongly expanded ventrally in lateral view (Fig. 4 F). In comparison, in M. guangxiensis the lamella of male antennomere III is shorter and 0.7 times as long as the joint itself (Li et al. 2015: fig. 45), the subapical part of phallus is moderately inflated laterally in ventral view (Fig. 4 B), and the apical part is moderately expanded ventrally in lateral view (Fig. 4 C). Etymology. The specific name is derived from the Latin expansus (to expand), referring to its strongly expanded subapical part of the phallus. Type material. Holotype. China: ♂ (IZAS), Zhejiang, Longquan, Fengyangshan, 29. vii. 2007, leg. L. K Tan. Description. Male (Fig. 3 B). Length 9.3 mm, width at humeri 1.9 mm. Body black. Pronotum, elytra and scutellum dark red. Surface covered with decumbent red pubescence (Fig. 3 B). Eyes small, interocular distance about 1.6 times greater than eye diameter. Antennae flabellate, overlapping basal 2 / 3 length of elytra when inclined. Antennomeres III – XI lamellate; lamella of III 0.9 times as long as joint itself and rounded apically; lamellae of IV – XI pointed at apices, lamella of IX longest, 3.9 times longer than joint itself (Fig. 3 B). Pronotum square, 1.2 times wider than long. Anterior margin widely rounded and projecting anteriad, lateral margins feebly sinuate and posterior margin bisinuate; anterior angles confluent with anterior margin, posterior angles sharp and moderately projected. Scutellum trapezoidal, feebly emarginate at apex (Fig. 3 B). Elytra 3.9 times longer than humeral width. Costae I and III weak but visible along its length, IV as strong as II (Fig. 3 B). Phallus slender (Fig. 4 D – F), basal part stout and distinctly narrowed towards middle in dorsal and ventral views (Fig. 4 D, E), subapical part strongly and asymmetrically inflated laterally, about 2.8 times as wide as basal part, with an oval ventral-cavity, apical part nearly parallel-sided, apex with a deep V-shaped notch, about 0.19 times as wide as subapical part; basal 1 / 3 part stout and curved ventrally in lateral view (Fig. 4 F), subapical part moderately inflated ventrally, apical part distinctly expanded ventrally, with a tapered lamella. Distribution (Fig. 2). China (Zhejiang).

Published as part of Du, Ruolan, Yang, Yuxia, Yang, Xingke & Liu, Haoyu, 2024, Five new species of the Macrolycus ligulatus species-group from China (Coleoptera, Lycidae), pp. 315-330 in ZooKeys 1208 on pages 315-330, DOI: 10.3897/zookeys.1208.125938