Quedius (Microsaurus) auchenias, Ejean, 2015

Ejean, 2015, Contributions to the knowledge of the Quediina (Coleoptera: Staphylinidae: Staphylinini) of China. Part 56. Genus Quedius STEPHENS, 1829 Subgenus Microsaurus DEJEAN, 1833. Section 23, Linzer biologische Beiträge 47 (2), pp. 1843-1854 : 1844-1845

Quedius (Microsaurus) auchenias nov.sp. ( Figs 1-8 )

T y p e l o c a l i t y: China, Hainan,Ledong County, Jianfengling Nature Reserve, Mingfenngu, 950 m.

T y p e m a t e r i a l: Holotype (): CHINA: " CHINA: Hainan Prov. Ledong County Jianfengling N. R. Mingfenngu 950 m., 29-IV-2012 Peng & Dai leg.". In SNUC . Allotype (): same data as holotype. In ASC . Paratypes: same data as holotype, 7, 9 ( ASC, SNUC) ; same data as holotype, but date 30-IV-2012, 1 ( SNUC) ; same data as holotype, but 1000 m, 18- V-2011, Bi Wen Juan leg., 1 ( SNUC) ; Hainan, Lingshui County, Diaoluoshan N. R., 1000 m, 24-IV-2012, Peng & Dai leg., 1 ( SNUC) .

D e s c r i p t i o n. Piceous to piceous-black, abdomen slightly iridescent; mouthparts, palpi, antennae and legs rufotestaceous. Head of rounded shape, wider than long (ratio 1.25), with posterior angles entirely obsolete, only vaguely narrowed behind eyes, neck therefore quite wide and not markedly differentiated from head, mostly by very fine superficial line interrupted medially; eyes large, moderately convex, tempora considerably shorter than eyes seen from above (ratio 0.22); no additional setiferous punctures between anterior frontal punctures; posterior frontal puncture and temporal puncture situated close to posteriomedial margin of eyes, separated from it by distance about equal to diameter of puncture; two punctures behind posterior frontal puncture at posterior margin of head; tempora impunctate; surface of head with extremely fine, superficial microsculpture of transverse waves with some micropunctulation. Antenna moderately long, segments 2 and 3 subequal in length, segments 4 and 5 longer than wide, following segments as long as wide, becoming gradually vaguely wider than long, last segment about as long as two preceding segments combined. Pronotum wider than long (ratio 1.25), widest at about posterior third, markedly narrowed anteriad, with lateral margins continuously arcuate with broadly rounded base, transversely convex, lateral portions not explanate; dorsal rows each with three fine punctures,; sublateral rows each reduced to one puncture near anterior pronotal margin; microsculpture similar to that on head but still finer and partially rudimentary. Scutellum impunctate, but with very fine transverse rugae on basal portion, basal portion in addition mostly slightly depressed, on remaining surface with extremely fine microsculpture of rudimentary transverse waves. Elytra short, at base somewhat narrower than pronotum at widest point, not appreciably dilated posteriad, at suture as long as, at sides vaguely longer (ratio 1.12) than pronotum at midline; punctuation moderately coarse and dense, becoming markedly finer toward lateral margin of each elytron, transverse interspaces between punctures on disc about as large as diameters of punctures; each elytron with three inconspicuous, irregular longitudinal rows of two or three coarser punctures bearing long setae, such setae also present at posterior margin and lateral declivous portion of each elytron; pubescence piceous; surface between punctures without microsculpture. Wings fully developed. Abdomen with tergite 7 (fifth visible) bearing fine whitish apical seam of palisade fringe; tergite two (in front of first entirely visible tergite) pale and impunctate; punctuation of abdominal tergites finer and sparser than that on elytra, mostly evenly covering each tergite; pubescence piceous, long; surface between punctures with excessively fine, hardy detectable rudimentary microsculpture.

Male. First four segments of front tarsus moderately dilated, subbilobed, each densely covered with tenent setae ventrally; segment two about as wide as apex of tibia; segment four narrower than preceding segments. Sternite 8 with two large setae at each side, otherwise very sparsely setose; with inconspicuous medioapical sinuation, no impunctate flattened area before sinuation present ( Fig.1 ). Genital segment with tergite 10 evenly narrowed toward narrowly arcuate apex, with a few rather short setae at apex, otherwise asetose ( Fig. 2 ); sternite 9 with narrow basal portion, apical portion slightly emarginated apically, with two apical setae, otherwise very sparingly setose ( Fig. 3 ). Aedoeagus ( Figs 4-7 ) with median lobe largely parallelsided, anteriorly suddenly narrowed into short apical portion with narrowly arcuate apex, on face adjacent to paramere, just in front of paramere, with conspicuous arcuate transverse carina, appearing as large dent in lateral view ( Fig. 7 ). Paramere narrow, parallelsided or vaguely narrowed anteriad, with arcuate apex about reaching transverse carina of median lobe; four minute apical setae and two much longer setae at each lateral margin below apex; underside with five fine sensory peg setae situated at apex of paramere.

Female. First four segments of front tarsus not appreciably different from those of male. Genital segment with tergite 10 as in Fig. 8 , with numerous setae at and near apex, otherwise asetose.

Length 6.0- 6.8 mm.

E t y m o l o g y. The specific epithet is the Greek noun in apposition αυχενιας (bullnecked). It refers to the wide neck 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 auchenias is at present known from two localities on the island of Hainan.

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 collected at low elevations around 1000 m.

R e c o g n i t i o n a n d c o m m e n t s Quedius auchenias is similar to Q. zeuxis SMETANA, 1997 , but it differs, in addition to the differently shaped aedoeagus, by several external characters, particularly by the larger size, by the larger eyes, by the even punctuation of the two first visible abdominal tergites, etc.

Figures

Figs 1-14: 1-8. Quedius auchenyas nov.sp.: (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) apical portion of aedoeagus, lateral view; (8) tergite 10 of female genital segment. 9-14. Quedius trachelos sp. nov.: (9) apical portion of male sternite 8; (10) tergite 10 of male genital segment; (11) sternite 9 of male genital segment; (12) aedoeagus, ventral view; (13) apical portion of median lobe, paramere removed; (14) apical portion of aedoeagus, lateral view.