Gabrius brevistrigatus, Li, Liang, Schillhammer, Harald & Zhou, Hong-Zhang, 2010

Li, Liang, Schillhammer, Harald & Zhou, Hong-Zhang, 2010, Fourteen new species of the genus Gabrius Stephens, 1829 (Coleoptera: Staphylinidae: Philonthina) from China, Zootaxa 2572, pp. 1-24 : 5-7

3. Gabrius brevistrigatus sp. n.

( Figs. 2 F–K)

Type material. Holotype: CHINA: Sichuan: ɗ, Baoxing: Longdong, 1795 m, 12.VIII.2003, leg. Yu Xiaodong (IZ-CAS). Paratypes: CHINA: Sichuan: ɗ, Baoxing: Fengtongzhai, 4.IX.2005, leg. Zhou Hongzhang (IZ-CAS); ɗ, Yajiang: Hekou, 2883 m, 27.V.2009, leg. Liang Hongbin (IZ-CAS).

Description. Head and pronotum black, shining. Antennae dark brown. Elytra black. Abdomen black with feebly blue reflex. Mandibles, maxillary and labial palpi and legs dark brown.

Body 5.06–5.71 mm long (HPL = 1.63–1.95 mm). Head of rounded quadrangular shape, 0.73–0.82 mm long, 0.65 mm wide (HW:HL = 0.80–0.89). Tempora 0.41 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes moderately large, slightly protruding, 0.16–0.25 mm long, 0.40–0.60 times as long as tempora. Dorsal surface of head with scattered, large setiferous punctures along lateral sides, vertex largely impunctate; entire head with characteristic microsculpture of short lines. Antennae short, 1st segment long, slightly thickened towards apex, 3rd segment almost as long as 2nd, 4th segment slightly longer than wide, 5th segment almost as long as wide, 6th–10th segments distinctly transverse, last segment longer than wide, obliquely truncated.

Pronotum slightly narrowed anteriad, 0.82–0.98 mm long, 0.73 mm wide, slightly wider than head (PW:HW = 1.12); dorsal rows each with five punctures, sublateral rows each with two punctures; large portion of medial disc without microsculpture and only rudimentary microsculpture anterior-laterally.

Elytra 0.98–1.06 mm long along sides, 1.06–1.14 mm wide, 1.08–1.20 times as long as pronotum, sparsely and largely punctate, punctures separated by 5–7 times their diameter. Scutellum large, triangular, sparsely and finely punctate and pubescent.

Abdomen slightly narrowed posteriad, widest 0.98 mm, finely and closely punctate, punctures separated by 2–3 times their diameter at base, gradually becoming sparser toward apex of each tergite; surface between punctures with exceedingly fine and dense microsculpture of transverse striae; tergites III–V with two basal lines, elevated area between basal lines almost impunctate.

Male. Sternite VIII with moderately wide medio-apical emargination filled by semi-membranous extension ( Fig. 2 K). Genital segment with styli of tergite IX simple, moderately setose apically. Sternite IX largely membranous at medial portion, basal portion short, almost symmetrical, apical portion long with slightly emarginate, pubescent apex ( Fig. 2 I). Tergite X simple, triangular, with inconspicuously emarginate apex, bearing two long apical setae ( Fig. 2 J).

Aedeagus slender; median lobe with apical portion evenly narrowed into obtusely rounded apex ( Fig. 2 F); in lateral view, apical portion of median lobe slightly bent dorsad ( Fig. 2 G); paramere entire, with apical portion in general triangular, subtruncated at apex, face adjacent to median lobe with sensory peg setae arranged along latero-apical and medio-apical margins ( Fig. 2 H).

Female. Unknown.

Remarks. The new species may belong to Gabrius astutus group. Gabrius brevistrigatus sp. n. is similar to G. h i m a l a y i c u s ( Bernhauer, 1915) and G. coeruleipennis Coiffait, 1983 in having body black, faint microsculpture on pronotum and very sparse punctures on elytra. Gabrius brevistrigatus sp. n. differs from G. himalayicus and G. coeruleipennis by paramere entire with triangular apex (paramere with distinct medioapical notch in G. himalayicus and paramere almost truncated apically in G. coeruleipennis ).

Distribution. The species is at present known only from China (Sichuan).

Etymology. The specific epithet is derived from a combination of the Latin words brevis- (short) and striga- (stripe), and refers to the characteristic microsculpture of short lines on the head.

Figures

FIGURE 2. Gabrius breviantennatus sp. n. A, aedeagus, ventral view; B, median lobe of aedeagus (paramere removed), lateral view; C, underside of paramere; D, sternite IX of male; E, tergite X of male; L, sternite VIII of male. Gabrius brevistrigatus sp. n. F, aedeagus, ventral view; G, median lobe of aedeagus (paramere removed), lateral view; H, underside of paramere; I, sternite IX of male; J, tergite X of male; K, sternite VIII of male. Scale bars 0.5 mm.