Horniella pilosa Yin and Li, new species

25. Horniella pilosa Yin and Li, new species

Figs 43 A, 44, 49G; Map 6

Type material (1 ♂♂, 2 ♀♀). Holotype, ♂, labeled ‘ Borneo, Sabah, Mt. Kinab. N. P., Por. H. S. area Eastern Ridge, Tr. 790 m, 17.viii.1988, A. Smetana [B119] / Holotype [red], ♂, Horniella pilosa sp. n., det. Yin & Li, 2014, MHNG’. Paratypes: 1 ♀, same data, except ‘Tr. 850 m, 28.viii.1988, [B158]’ (MHNG); 1 ♀, labeled ‘ SABAH: Poring Hot Spring, 500 m, 06.v.1987, Burckhardt- Löbl’ (MHNG). Each paratype bears a yellow type label similar to that of the holotype except ‘ Paratype ♂ (or ♀)’.

Description. Male (Fig. 43 A). Length 3.70 mm. Head distinctly longer than wide, HL 0.79 mm, HW 0.59 mm; anterolateral genal projections (Fig. 44 C) weakly indicated; median sulcus between antennal tubercles short; scapes (Fig. 44 B) lacking expansion at lateral margins; clubs (Fig. 44 A) formed by apical three antennomeres, each distinctly elongate; venter lacking lateral spines (Fig. 44 D). Maxillary palpomeres II greatly elongate, slightly broadened at apical 1/3. Each eye composed of about 42 facets. Pronotum longer than wide, PL 0.81 mm, PW 0.71 mm. Elytra wider than long, EL 0.87 mm, EW 1.28 mm; discal striae reaching near anterior margin of elytra. Protrochanters simple, profemora (Fig. 44 E) each with one indistinct ventral denticles at base, barely visible, protibiae (Fig. 44 F), mesotrochanters, mesofemora (Fig. 44 G), and mesotibiae (Fig. 44 H) simple, ventral margin of mesofemora and mesal margin of metatibiae (Fig. 44 I) with dense long hairs; tarsomeres II extending to midlength of tarsomeres III. Abdomen large, AL 1.23 mm, AW 1.26 mm, tergite IV (first visible tergite) with median carina extending through tergal length, lacking lateral discal carinae, tergite V with median carina extending to apical 4/5 of tergal length. Sternite IX (Fig. 44 J) nearly oval, with well-sclerotized apical portion and less sclerotized basal portion. AeL 0.71 mm; aedeagus (Figs 44 K–M) with nearly symmetric median lobe in dorso-lateral view, obliquely truncate apex narrowed; endophallus composed two elongate sclerites and apical membranous structure with rows of small denticles.

Female. Similar to male in general appearance; each eye composed of about 35 facets; Legs simple, mesofemora and metatibiae lacking long hairs. BL 3.57–3.58 mm, HL 0.76–0.77 mm, HW 0.59–0.60 mm, PL 0.76–0.81 mm, PW 0.68–0.70 mm, EL 0.85–0.88 mm, EW 1.23– 1.25 mm, AL 1.12–1.20 mm, AW 1.23–1.26 mm. Genital complex (Fig. 49 G) well-sclerotized, composed of elongate apical part and transversely oval basal part.

Differential diagnosis. This species is placed as a member of the H. gigas group. Males can be readily separated from those of H. gigas and H. smetanai by the presence of long hairs on the ventral margins of the mesofemora and mesal margins of the metatibiae, while the legs of the two other species are normally setose.

Distribution. East Malaysia: Sabah (Map 6).

Collection notes. Adults were probably collected from leaf litter samples by sifting and using of Winkler-Moczarski extractors.

Etymology. The specific name ‘ pilosa ’ means ‘covered with hair, shaggy’, referring to the long hairs present on the mesofemora and metatibiae.