Batrisodes xuhaoi, Jiang, Ri-Xin & Yin, Zi-Wei, 2017

Jiang, Ri-Xin & Yin, Zi-Wei, 2017, Eight new species of Batrisodes Reitter from China (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 694, pp. 11-30 : 21-25

Batrisodes xuhaoi sp. n. Figs 8, 9, 14

Type material

(5 exs). Holotype: CHINA: ♂, labeled 'China: Sichuan, Luding County (泸定县), Gonggashan N. R. (贡嘎山自然保护区), Hongshitan (红石滩), ant nest under rock, 29°48'10"N, 102°03'42"E, 2740 m, 24.vi.2016, XU Hao & QIU Jianyue leg.' (SNUC). Paratypes: CHINA: 3 ♂♂, 1 ♀, same label data as the holotype (SNUC).

Diagnosis of male.

Batrisodes xuhaoi can be separated from all other Chinese congeners by the following combination of characters: stout general habitus, moniliform antennomeres, antennomere XI with a thick projection at base, profemur strongly expanded near middle, mesotrochanter expanded at ventral margin, mesofemur with a small ventral spine at middle, mesotibia with acute spines at middle and apex, and asymmetrical, elongate aedeagus broadened at the apex.

Description.

Male. (Fig. 8A), Body reddish brown, BL 2.76-2.80 mm. Head wider than long, near trapezoidal, rough and covered with short hair, HL 0.50-0.51 mm, HW 0.62-0.63 mm, with large vertexal foveae, antennal tubercles prominent; area between moderately raised antennal tubercles obviously concave; clypeus slightly punctate, with round anterior margin; lateral longitudinal carinae short and slight, extending from level of eyes to head base, lacking median vertexal carina. Each eye composed of about 50 facets. Antennomeres II–XI moniliform, XI (Fig. 9A) large, with distinct, apically-truncate basal denticle. Pronotum as long as wide, PL 0.63-0.64 mm, PW 0.63-0.64 mm, disc slightly convex; with distinct median antebasal foveae, median and lateral longitudinal sulci present; lateral antebasal fovea large and distinct; outer and inner basolateral foveae small but distinct. Elytra wider than long, EL 0.85-0.86 mm, EW 0.92-0.94 mm; each elytron with three small but distinct basal foveae, discal striae shallow and short. Profemora (Fig. 9B) strongly expanded at middle, mesofemora (Fig. 9C) with thin but distinct ventral spine near middle; mesotibiae (Fig. 9D) slightly swollen at apical 1/3, with small ventral denticle near middle and small triangular apical spine. Abdomen wider than long, AL 0.77-0.80 mm, AW 0.90-0.93 mm; tergite IV (first visible tergite) longest, nearly twice as long as next, with strongly oblique marginal carinae; tergite V–VI with obvious oblique marginal carinae. Aedeagus (Fig. 9 E–F) nearly symmetrical, slender, length 0.44 mm, median lobe simple, flattened, broadened at apex.

Female (Fig. 8B). General habitus similar to male, antennomere XI lacking basal denticle; each eye composed of about 40 facets; legs lacking denticle and spine; tergite VIII (Fig. 9G) semicircular; sternite VIII (Fig. 9H) transverse; symmetrical genital complex (Fig. 9I) slightly sclerotized. Measurements of body parts: BL 2.82 mm, HL 0.51 mm, HW 0.64 mm, PL 0.65 mm, PW 0.64 mm, EL 0.88 mm, EW 0.96 mm, AL 0.78 mm, AW 0.93 mm.

Distribution.

Southwestern China: Sichuan.

Host ant.

Lasius sp.

Biology.

All adults were collected from ant colonies nesting on the ground under stones (Fig. 14).

Etymology.

The specific epithet is dedicated to Hao Xu, co-collector of the type series.