Taxonomic notes on the ground beetles in the genus Trephionus Bates, 1883 from central Honshu, Japan (Coleoptera, Carabidae, Sphodrini, Synuchina) Author Sasakawa, Koji Author Ito, Hirotaro text ZooKeys 2018 742 91 104 http://dx.doi.org/10.3897/zookeys.742.23752 journal article http://dx.doi.org/10.3897/zookeys.742.23752 1313-2970-742-91 7E8BEE3CF7CB4A039484A6747E17149F 7E8BEE3CF7CB4A039484A6747E17149F Trephionus bifidilobatus Sasakawa & Ito sp. n. [Japanese name: Mitake-hoso-hirata-gomimushi] Figs 9, 19 Type material. Holotype: ♂, Kotosawa, alt. ca. 310 m, Mitake, Oume-shi, Tokyo ( 35.795931°N , 139.168746°E ), 10-12.IX.2009, K. Sasakawa leg. Diagnosis . Similar to T. shibataianus and T. abiba sp. n. in having truncate aedeagal apex and small body, but distinguished by larger PI (i.e., wider pronotum) and reddish brown elytra. Description. Body length: ♂, 8.2 mm (n = 1). PI: ♂, 1.32 (n = 1). Head and pronotum black, elytra reddish brown. Pronotal lateral margins sinuate before hind angles (Fig. 9). Mid tarsal segment 1 bisulcate; hind tarsal segment 1 sulcate on outer side, not on inner side; tarsal segment 5 lacks secondary setae on dorsal side. Apex of aedeagus truncate, slightly emarginated at middle (Fig. 19c); endophallus (Fig. 19a, b) stout, almost straight, directed posterodorsally; gonopore opening directed right-dorsoposterolaterally; dorsobasal lobe widely swollen, with BD wider than AW; right laterobasal lobe widely swollen, with BD as wide as AW; left laterobasal lobe widely swollen, with BD wider than AW; dorsoapical lobe markedly developed, bifid at apex, with BD more than 0.8 times AW; sclerotization of sclerotized lobe as same as aedeagus; anteroposterior length of sclerotized rim of gonopore as long as proximodistal length of sclerotized lobe. Etymology. The name refers to the bifid apex of the dorsoapical lobe of the endophallus. Figures 2-9. Dorsal view of Trephionus species: 2 T. kinoshitai , male from Mt. Shirouma 3 T. cylindriphallus sp. n., holotype male 4 T. niumontanus sp. n., holotype male 5 T. babai , male from Mt. Ishikiri 6 T. shibataianus , male from Mt. Naka 7 T. inexpectatus sp. n., holotype male 8 T. abiba sp. n., holotype male 9 T. bifidilobatus sp. n., holotype male. Figures 10-19. Left lateral (a) and dorsal (b) views of the endophallus and ventral view of the aedeagal apex (c) of Trephionus spp.: 10 T. kinoshitai from Mt. Shirouma 11 another specimen of T. kinoshitai from Mt. Shirouma, showing directions and examples of measurements for descriptions 12 T. cylindriphallus sp. n., holotype male; 13 T. cylindriphallus sp. n., a paratype male from Abe Pass 14 T. niumontanus sp. n., holotype male 15 T. babai from Mt. Ishikiri; 16 T. shibataianus from Mt. Naka 17 T. inexpectatus sp. n., holotype male 18 T. abiba sp. n., holotype male 19 T. bifidilobatus sp. n., holotype male. Abbreviations: AW, the width of the aedeagus at the ostium from the dorsal view; BD, the basal diameter of the lobe from dorsal view; da, dorsoapical lobe; db, dorsobasal lobe; go, gonopore; lb, left laterobasal lobe; rb, right laterobasal lobe; sl, sclerotized lobe.