Quedius (Distichalius) bipictus, Smetana, 2015

Smetana, Aleš, 2015, Contributions to the knowledge of the Quediina (Coleoptera, Staphylinidae, Staphylinini) of China. Part 51. Genus Quedius STEPHENS, 1829. Subgenus Distichalius CASEY, 1915. Section 4, Linzer biologische Beiträge 47 (1), pp. 905-924 : 908-910

Quedius (Distichalius) bipictus nov.sp. ( Figs 8-14 )

T y p e l o c a l i t y: China, Guangxi, Shangsi County, Shiwandashan Nature Reserve, 300-

500 m.

T y p e m a t e r i a l: Holotype (3) and allotype (♀): CHINA: "China: Guangxi Prov. Shangsi County, Shiwandashan N.R. 300-500 m, 23-IV-2011 ZHAI, PENG &ZHU leg.". Holotype in SNUC, allotype in ASC. Paratypes: same data as holotype: 233, 5♀♀ (ASC, SNUC); Zhejiang Prov., Zhuji City, Dongbaishan, alt. 300 m, 20-XI-2012, Tie-Xiong ZHAO leg., 13 (SNUC). Fujian: Wuyi Shan Nat. Res., Guadun hill (900-1300 m), 1.-2.VI.2001, Hlaváč & Cooter lgt./ Quedius sp. aff. meng Smet. A. Solodovnikov det. 2003 / Quedius (Distichalius sp. n. Det. A. Smetana 2004/, 13 (NMB).

D e s c r i p t i o n: Head and pronotum black, elytra yellow with black markings, usually with large, common black spot expanded laterad on each elytron, leaving lateral portion of each elytron (wide anteriorly, narrow posteriorly), narrow posterior edge and suture yellow, rarely black spot reduced to cover evenly medial half of each elytron and leaving narrow area along posterior margin yellow; abdominal tergites piceous-black, each usually with posterior margin slightly paler; tergite 2 (in front of first entirely visible tergite) dark yellowish; maxillary and labial palpi piceous, becoming paler toward apex, antennae piceous-black to black, with two basal segments at least partially slightly paler; legs pale brunneous, medial faces of middle and hind tibiae markedly darkened. Head of rounded shape, slightly wider than long (ratio 1.2), distinctly narrowed behind eyes, posterior angles entirely obsolete; eyes large, moderately convex, tempora markedly shorter than eyes seen from above (ratio 0.42); two setiferous punctures between anterior frontal punctures; posterior frontal puncture situated quite close to posteriomedial margin of eyes, separated from it by distance about equal to diameter of puncture, one additional puncture in front of posterior frontal puncture quite close to it and to medial margin of eye; temporal puncture situated closer to posterior margin of eye than to posterior margin of head; two (rarely three unilaterally) punctures behind posterior frontal puncture at posterior margin of head; surface of head with extremely fine and dense microsculpture of transverse waves. Antenna rather short, segment 3 longer than segment 2 (ratio 1.30), segment 4 slightly longer than wide, segment 5 about as long as wide, following segments vaguely to slightly wider than long, last segment about as long as two preceding segments combined. Pronotum slightly wider than long (ratio 1.13), widest at posterior third, markedly narrowed anteriad, with lateral margins continuously arcuate with broadly rounded base, transversely convex; dorsal rows each with three punctures, two additional punctures between dorsal and sublateral rows, sublateral rows each with two or three punctures, posterior puncture situated way behind large lateral puncture, one additional puncture anteriomedian of large lateral puncture; microsculpture on pronotum similar to that on head, but even finer and more superficial. Scutellum impunctate, with very dense and fine microsculpture of transverse waves. Elytra relatively long, at base somewhat narrower than pronotum at widest point, only vaguely widened posteriad; at suture slightly (ratio 1.15), at sides distinctly (ratio 1.31) longer than pronotum at midline; punctation moderately coarse, evenly spaced, transverse interspaces between punctures about as large as diameters of punctures; surface between punctures without microsculpture; pubescence piceous. Wings fully developed. Abdomen with tergite 7 (fifth visible) bearing distinct whitish apical seam of palisade fringe; tergite two (in front of first entirely visible tergite) impunctate; punctuation of abdominal tergites much finer than that on elytra, becoming somewhat sparser toward apex of each tergite and in general toward apex of abdomen; pubescence piceous; surface between punctures with exceedingly fine and dense transverse striae.

Male. First four segments of front tarsus markedly dilated, each densely covered by tenent setae ventrally; segment two vaguely wider than apex of tibia (ratio 1.10); segment four narrower than preceding segments. Sternite 7 vaguely, widely sinuate apically, with two long setae at each side of sinuation; sternite 8 with two long setae on each side, with wide and deep obtusely triangular medioapical emargination, small triangular area before emargination flattened and smooth ( Fig. 8 ). Genital segment with tergite 10 narrow, markedly narrowed toward narrowly arcuate apex, setose as in Fig. 9 ; sternite 9 with short, narrow basal portion, apical portion subtruncate apically, with numerous long setae at apex ( Fig. 10 ). Aedoeagus ( Figs 11-13 ) quite narrow, elongate; median lobe parallelsided in middle portion, anteriorly with two apical lobes; paramere narrow and long, covering most of median lobe, with narrowly arcuate apex exceeding apex of median lobe; four fine setae at apex, medial pair longer than lateral pair, two similar setae at each lateral margin below apex; underside of paramere with very numerous sensory peg setae covering area below apex and extended as an irregular longitudinal group considerably backward ( Fig. 13 ).

Female. First four segments of front tarsus similar to those of male, but less dilated, segment two vaguely narrower than apex of tibia. Genital segment with tergite 10 wide basally but from there conspicuously narrowed toward acute apex, with numerous long setae at and near apex, otherwise asetose ( Fig. 14 ).

Length 7.5-8.5 mm.

E t y m o l o g y: The specific epithet is the combination of Latin adverb bis (twice) and the adjective pictus, - a, - um (painted). It refers to the coloration of the elytra of the species.

G e o g r a p h i c a l d i s t r i b u t i o n Quedius bipictus is at present known from one locality in each Fujian, Guangxi and Zhejiang provinces.

B i o n o m i c s:Nothingisknown about the collecting circumstances of the specimens of the original series except that they were taken at very low elevation of 300- 500 m.

R e c o g n i t i o n a n d c o m m e n t s Quedius bipictus may be easily recognized, in addition to both the male and female sexual characters, by the combination of the coloration of the evenly punctate elytra and the characteristic chaetotaxy of both the head and pronotum.

Quedius bipictus occurs together with Q. pretiosus in the Shiwandashan Nature Reserve in Guangxi.

Figures

Figs 1-10: 1-7: Quedius tincticeps sp. nov.: (1) apical portion of male sternite 8; (2) tergite 10 of male genital segment; (3) sternite 9 of male genital segment; (4) aedoeagus, ventral view; (5) apical portion of median lobe, paramere removed; (6) apical portion of underside of paramere with sensory peg setae; (7) tergite 10 of female genital segment. 8-10: Quedius bipictus sp. nov.: (8) apical portion of male sternite 8; (9) tergite 10 of male genital segment; (10) sternite 9 of male genital segment.

Figs 11-19: 11-14: Quedius bipictus sp. nov.: (11) aedoeagus, ventral view; (12) apical portion of aedoeagus, lateral view; (13) apical portion of underside of paramere with sensory peg setae; (14) tergite 10 of female genital segment. Quedius gynaikos sp. nov.: (15) tergite 10 of female genital segment. 16-19: Quedius causarius sp. nov.: (16) apical portion of male sternite 8; (17) tergite 10 of male genital segment; (18) sternite 9 of male genital segment; (19) aedoeagus, ventral view.