Six new species of Horniella Raffray from the Oriental region (Coleoptera, Staphylinidae, Pselaphinae) Author Zhang, Wen-Xuan Laboratory of Systematic Entomology, College of Life Sciences, Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai 200234, China Author Hu, Fang-Shuo https://orcid.org/0000-0003-1269-8904 Department of Entomology, National Chung Hsing University 145 Xingda Rd., South District, Taichung City 402, Taiwan, China Author Yin, Zi-Wei https://orcid.org/0000-0001-6659-9448 Laboratory of Systematic Entomology, College of Life Sciences, Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai 200234, China pselaphinae@gmail.com text ZooKeys 2021 2021-06-04 1042 1 22 http://dx.doi.org/10.3897/zookeys.1042.66576 journal article http://dx.doi.org/10.3897/zookeys.1042.66576 1313-2970-1042-1 B0B0F76E89504A0AB45D701730486B56 0930CA7A3EDB571AA10D026EF39B1739 Horniella khasiensis Zhang & Yin sp. nov. Figures 4A , 5 Type material. Holotype : India : ♂, 'INDIA, Meghalaya State (7+9), E Khasi Hills, 11km SW Cherrapunjee, Laitkynsew, 25.iv.2008, 25°12'48"N , 91°39'48"E , 735 m, Fikacek , Podskalska , Sipek lgt. / secondary tropical rainforest with young trees + bamboo, below village, thin layer of leaf litter (sifting).' (MHNG). Figure 4. Dorsal habitus of Horniella species A H. khasiensis sp. nov. B H. nantouensis sp. nov. Scale bars: 1 mm. Diagnosis. Male. Head wider than long, with distinct anterolateral genal projection, anterior margin of projection roundly emarginate; with markedly long ocular canthus; scape angularly expanded at middle of lateral margin, antennomeres 9-11 enlarged. Pronotum rounded at anterolateral margins. Protrochanter and profemur each with long ventral spine; mesotrochanter with short, small ventral tubercle. Tergite 1 (IV) with median carina extending posteriorly for approximately 1/4 of tergal length, lacking discal carinae, tergite VIII with large medioapical process. Aedeagus with slightly asymmetric median lobe, apex broadly truncate in dorso-ventral view; endophallus composed of three sclerites. Description. Male. Body reddish-brown, length 2.84 mm. Head (Fig. 5A ) wider than long, HL 0.56 mm, HW 0.63 mm; anterolateral genal projection distinct, anterior margin of projection roundly emarginate; antenna 1.85 mm long, scape angularly expanded at middle of lateral margin, antennomeres 2-8 slightly elongate or moniliform, club loosely formed by apical three moderately enlarged antennomeres, antennomere 11 largest, slightly shorter than antennomeres 9 and 10 combined; indistinct lateral postantennal pits present; eyes prominent, each composed of approximately 40 large facets, with markedly long and curved ocular canthi (Fig. 5B ). Figure 5. Diagnostic characters of Horniella khasiensis sp. nov. A left half of head, in dorsal view B head, in lateral view C protrochanter and profemur D protibia E mesotrochanter and mesofemur F mesotibia G-I aedeagus, in dorsal ( G ), lateral ( H ) and ventral ( I ) view. Scale bars: 0.2 mm ( A-I ). Pronotum as long as wide, PL and PW 0.64 mm, widest anterior to middle; lateral margins rounded; disc moderately convex, finely punctate, with distinct median antebasal and lateral antebasal foveae connected by complete transverse antebasal sulcus. Elytra much wider than long, EL 0.75 mm, EW 1.2 mm; each elytron with two large, setose basal foveae; discal striae extending from outer basal foveae to near posterior margin of elytra. Legs elongate; protrochanter (Fig. 5C ) with elongate ventral spine, profemur (Fig. 5C ) with conspicuously long ventral spine near base, protibia (Fig. 5D ) simple; mesotrochanter (Fig. 5E ) with short and small ventral tubercle, mesofemur (Fig. 5E ) and mesotibia (Fig. 5F ) simple. Abdomen broader than long, broadest at lateral margins of tergite 1 (IV), AL 0.89 mm, AW 1.21 mm; tergite 1 (IV) largest, as long as tergites 2 and 3 (V and VI) combined, with short median carina extending to near basal 1/4 of tergal length, lacking discal carinae, tergite 2 (V) lacking carina, tergites 2-4 (V-VII) each with small basolateral foveae, tergite 5 (VIII) with large medioapical process. Sternite 2 (IV) with broad basal sulcus, lacking mediobasal foveae, basolateral foveae developed as large cuticular pockets, with two pairs of antebasal nodules, sternites 3-5 (V-VII) with basolateral foveae, one median and two lateral nodules, sternite 7 (IX) nearly oval, with well-sclerotized apical half and less sclerotized basal half. Aedeagus (Fig. 5G-I ) 0.59 mm long, median lobe nearly symmetric, apex broadly truncate; endophallus composed of three sclerites: one elongate, plate-like sclerite with curved lobe at apex; one curved sclerite at base, and one much narrower sclerite at left. Female. Unknown. Comparative notes. This species is placed as a member of the H. burckhardti group, and is most similar to H. hongkongensis Yin & Li in having similar spination of the legs and a general aedeagal form. They can be clearly separated by the more distinctly expanded basolateral margin of the scape, tergite VIII with a large medioapical process, and the different structure of the aedeagal endophallus. Distribution. India: Meghalaya. Etymology. The new species is named after its type locality, the East Khasi Hills.