Synopsis of the Japanese species of Aleocharinae (Coleoptera: Staphylinidae), with review of the type specimens II. Genus Myllaena Erichson of tribe Myllaenini with redescription of four Japanese species Author Liu, Tian-Tian 0000-0002-1971-7883 The Kyushu University Museum, Fukuoka 812 - 8581, Japan & 13131203225 @ 163. com; https: // orcid. org / 0000 - 0002 - 1971 - 7883 Author Nozaki, Tsubasa 0000-0002-2419-4968 The Kyushu University Museum, Fukuoka 812 - 8581, Japan & 1 nozakki. 4 ori. 27 arthropoda. 256 @ gmail. com; https: // orcid. org / 0000 - 0002 - 2419 - 4968 1nozakki.4ori.27arthropoda.256@gmail.com Author Yamamoto, Shûhei The Hokkaido University Museum, Sapporo 060 - 0810, Japan Author Maruyama, Munetoshi The Kyushu University Museum, Fukuoka 812 - 8581, Japan text Zootaxa 2022 2022-01-13 5091 2 373 382 journal article 2602 10.11646/zootaxa.5091.2.8 30952597-d5c2-4b06-8f7c-005070536131 1175-5326 5843827 E7B06F66-AB66-43DB-9F95-AFBA71088446 Myllaena torrentum Cameron, 1933 [Japanese name: Ô-migiwa-hanekakushi] (Figs. 2, 10–11, 18) Myllaena torrentum Cameron, 1933: 172 (original description; type locality: Japan , “KOBE: Cascade Valley” [Kôbe-shi, Hyôgo-ken, western Honshû]); Smetana 2004: 465 (catalogue); Schülke & Smetana 2015: 679 (catalogue). Type material. Holotype ?, ♂ , “ Type [RRL]// JAPAN / Kobe / Cascade /20.XII.27// M. torrentum / TYPE Cam.// Cameron /Bequest./B. M. 1955–147.” (abdominal segments VII–X and aedeagus were dissected and mounted by MM ). Distribution. Japan ( Honshû: Hyôgo ). Redescription. Male. Body (Fig. 2) large, robust, about 2.8 mm , widest at elytra. Color brown, but mouthparts, basal segments of antennae, and legs reddish brown; pronotum and elytra similarly colored, paler than head. Head subtriangular, more or less produced anteriorly, wider than length, shorter than pronotum and almost as long as shortest length of elytra; eyes medium sized, almost as long as temporal length; antenna reddish brown, almost as long as total length from head to pronotum; remaining segments longer than width; segment I about half shorter than II, almost as long as III; XI almost as long as II, about 2 times longer than I; antennal segments VIII–X length almost as long as width. Pronotum almost as long as longest of elytra, and wider than head, trapezoid and wider than length, widest width about 1.7 times wider than narrowest width. Elytra wider than length; hindwings fully developed. FIGURES 1–5 Habitus of Myllaena spp. , 1, Lectotype of M. japonica Sharp, 1888 ; 2, Holotype of M. torrentum Cameron, 1933 ; 3, Lectotype of M. rufotestacea Cameron, 1933 ; 4, Lectotype of M. lewisi Cameron, 1933 ; 5, M. japonica Sharp, 1888 (Shizuoka) . Scale bars: 1.0 mm. FIGURES 6–11 Myllaena japonica Sharp, 1888: 6 , Median lobe, lateral view (Lectotype); 7, Median lobe, dorsal view (Lectotype); 8, Spermatheca (Shizuoka); Myllaena sp. : 9, Spermatheca (Nagasaki); M. torrentum Cameron, 1933: 10 , Median lobe, lateral view; 11, Median lobe, dorsal view. Scale bars: 0.1 mm. FIGURES 12–17 Myllaena rufotestacea Cameron, 1933: 12 , Median lobe, lateral view; 13, Median lobe, dorsal view; 14, Spermatheca; M. lewisi Cameron, 1933: 15 , Median lobe, lateral view; 16, Median lobe, dorsal view; 17, Spermatheca. Scale bars: 0.1 mm. Median lobe of aedeagus (Figs. 10 – 11) with base of apical lobe slightly dentate in lateral view; flagellum long, thick; basal sclerites contiguous; apical sclerites connected to form crescent shape. Female unknown. Measurements of lectotype . BL, ≈ 2.8; PL, 0.52; PW, 0.75; HTL, 0.28. Comments. This species was originally described from “ Cascade Valley ” of Kôbe-shi. Only a single specimen with RRL was found in BMNH and this may represent holotype though the number of the examined specimens was not specified in the original description. A distribution map of the examined specimens of this species in Japan is illustrated in Fig. 18 .