Hingstoniella trigona, Zi-Wei Yin & Li-Zhen Li, 2015

Zi-Wei Yin & Li-Zhen Li, 2015, Review of the Himalayan genus Hingstoniella Jeannel, and description of Besuchetaceus gen. n. from Nepal (Coleoptera: Staphylinidae: Pselaphinae), Revue suisse de Zoologie 122 (1), pp. 165-180 : 170-175

Hingstoniella trigona sp. n.

Figs 3 B, 7, 12

Holotype: Holotype ♂, NEPAL: labeled ‘Taksanggeb., b. Tukche, Takola [Pa327-327a, overleaf] / Zentral- Nepal, Sept.-Okt. 1971, lg. H. Franz / n. sp. / HOLOTYPE [red], ♂, Hingstoniella trigona sp. n., det. Yin & Li, 2014, MHNG’; in MHNG, without accession number.

Paratypes: NEPAL, 1 ♂, labeled ‘NEPAL, Kali Gandaki, vall., Nilgiri Himal. upp., Titigaon vill., 3000- 3200 m NN, 21.V.2002, leg. J. Schmidt’. ‒ 1 ♀, labeled ‘NEPAL, Annapurna Reg., Umg. Ghorepani, 2800 m, 28°24′15″N, 83°42′0 1″E, 22.IV.2000, leg. A. Weigel’. ‒ 1 ♀, labeled ‘Zentral - Nepal, Annapurna - SW, 16.4.82, 4500 m, Baum / COLL. PANKOW [1 ex Myrmica pinned under specimen]’; in MHNG, without accession number.

Each paratype bears a type label similar to that of holotype except ‘Paratype [yellow], ♂ [or ♀]’.

Description: Male ( Fig. 3 B). BL 3.36-3.44 mm. Body reddish brown; most part of dorsal surface densely hairy.

Head ( Fig. 7 A) distinctly transverse, HL 0.58-0.60 mm, HW 0.85-0.86 mm; vertex slightly convex, modification composed of distinct triangular bump, foveae located below level of posterior margins of eyes; each eye with about 40 small facets; antennal clubs formed by apical three enlarged antennomeres ( Fig. 7 B). Pronotum transversely octagonal, PL 0.70-0.73 mm, PW 1.04- 1.06 mm, median longitudinal sulcus moderately developed. Elytra wider than long, EL 1.02-1.04 mm, EW 1.26-1.30 mm; shallow discal striae extending to half of elytral length. Metathoracic wings fully developed. Protibiae ( Fig. 7 C) slightly projected at mesal margins near apices; mesotrochanters ( Fig. 7 D) with small Fig. 5. Aedeagus of Hingstoniella lata in populations from various localities (A, E, I, M Dorsal view. B, F, J, N Lateral view. C, G, K, O Ventral view. D, H, L, P Axial view.). (A-D) Population from Tonglu, Darjeeling, India. (E-H) Population from “Bakan” W of Tashigaon, Nepal. (I-L) Population from Lughla, Khumbu, Nepal. (M-P) Population from Gairi, Nepal. Scales: 0.2 mm.

denticle at ventral margin; metatrochanters ( Fig. 7 E) with ventral margin protruding to form long projection. Abdomen wider than long, AL 1.04-1.09 mm, AW 1.17- 1.18 mm. Aedeagus ( Fig. 7 F-I) asymmetric, length 0.50- 0.51 mm.

Female. Similar to male in general appearance, protibiae, mesotrochanters, and metatrochanters lacking protuberance or projection. Each eye with about 35 facets. Tergite VIII ( Fig. 7 J) and sternite VIII ( Fig. 7 K) transverse. Genital complex ( Fig. 7 L) transverse, width 0.40 mm. Measurements: BL 3.48-3.56 mm, HL 0.58- 0.59 mm, HW 0.87-0.88 mm, PL 0.76-0.77 mm, PW 1.14-1.15 mm, EL 1.03-1.07 mm, EW 1.33-1.35 mm, AL 1.07-1.17 mm, AW 1.20-1.26 mm.

Differential diagnosis: The new species can be separated from H. lata by the male possessing a different form of the vertexal modification, as well as the less projected apical portion of the protibiae, and the longer ventral projection of the metatrochanters.

Biology: One Myrmica ant is pinned under the female paratype from Annapurna, indicating that the new species probably represents a similar myrmecophily as H. lata.

Distribution: Nepal: Daulagiri ( Fig. 12).