Scydmaenus vestitus

Scydmaenus (s. str.) vestitus (Sharp, 1874) Chinese common name: AE毛ẅm (Fig. 4) Eumicrus vestitus Sharp, 1874: 126; 1886: 49. Type locality: Japan. Scydmaenus (s. str.) vestitus; Reitter 1913: 267; Franz 1985: 109; Schülke & Smetana 2015: 898; O’Keefe & Li, J.-K. 1999: 160. Scydmaenus kunmingensis Franz, 1988: 24; O’Keefe & Li 1999: 160. Type locality: Yünnan, Kunming. Syn. nov. Scydmaenus (s. str.) kunmingensis; Vít 2004: 226; Schülke & Smetana 2015: 897; Li, L.-Z. et al. 2019: 342; Jałoszyński 2021b: 358. Syn. nov. Material examined (4 exx.). 2 ♂♂, 2 ♀♀: ‘ China: Yunnan, Zhaotong City, Wumengshan Natural Reserve, Xiaoyanfang Station, 28.249860°N, 103.975665°E, 1840–2060 m, 13.vii.2022, Wei leg., 云南DZdz乌AE山小岩坊 ṄM国Dzẍ ’ (SNUC). Diagnosis. Male. Body (Fig. 4A) length over 2.50 mm. Head and pronotum finely and rather sparsely punctate. Head slightly transverse, suboval, tempora much longer than eyes; antenna with antennomere 5 much longer than 4 and 6, 8 transverse, 9–11 greatly enlarged and forming distinct club, 11 subconical. Pronotum bell-shaped, with four large antebasal impressions. Each elytron with round apex, well exposing pygidium. Metaventrite (Fig. 4B) with large impression at middle, sides of impression forming short, setose ridges posteriorly. Protarsomere 1 broadened, tarsomeres successively narrowing from 1 to 5; mesotrochanter angulate on ventral margin, mesotibia (Fig. 4C) with long apical spine; metatibia angulate at inner-apical margin. Aedeagus (Fig. 4D, E) elongate, dorso-ventrally symmetric, laterally greatly curved at middle; apical portion of endophallus armature composed of two sclerites pointed at apices, one markedly long and the other much shorter; area above foramen and below apex of median with short and dense setae. Female. Body length slightly shorter than male. Antenna shorter. Metaventrite moderately convex at middle, lacking impression or ridges. Protarsus slender; ventral margin of mesotrochanter rounded; mesotibia lacking apical spine; metatibia lacking apical angulation. Spermatheca (Fig. 4F) spherical, dome-shaped, with funnel-like structure located on same axis as insertion of accessory gland. Description. See Jałoszyński 2021b: 358. Measurements for Wumengshan population: male body length 2.66–2.72 mm, length/width of head 0.49–0.50/0.56– 0.50 mm, pronotum 0.73–0.78/ 0.65–0.69 mm, elytra 1.33– 1.40/ 1.08–1.13 mm, length of antenna 1.29–1.35 mm; female body length 2.22–2.38 mm, length/width of head 0.46–0.48/ 0.45–0.48 mm, pronotum 0.63–0.74/ 0.56–0.67 mm, elytra 1.22–1.27/ 1.04–1.07 mm, length of antenna 1.12–1.22 mm; longest diameter of spermatheca 0.15 mm. Distribution. Japan (Honshu, Kyushu, Ryukyu Is.); South Korea; China (Sichuan, Yunnan, Taiwan). Remarks. This species is readily distinguishable and exhibits a widespread distribution ranging from Japan through China (mainland and Taiwan). The proposed synonymy of S. vestitus with S. kunmingensis is based on a comparison of specimens from Yunnan with the original descriptions and aedeagal illustrations of both taxa. The large body size, male-specific tibial modifications, metaventrite characteristics, and the structural configuration of the aedeagal endophallus are distinctive and consistent across all known populations. The spermatheca of this species is illustrated for the first time. All individuals were collected together with S. chinensis.