Pseudohesperus rutiliventris, (SHARP, 1874)

Li, Liang & Zhou, Hong-Zhang, 2011, Revision and phylogenetic assessment of the rove beetle genus Pseudohesperus Hayashi, with broad reference to the subtribe Philonthina (Coleoptera: Staphylinidae: Staphylinini), Zoological Journal of the Linnean Society 163 (3), pp. 679-722 : 708-712

PSEUDOHESPERUS RUTILIVENTRIS ( SHARP, 1874) , FIRST RECORD FROM CHINA ( FIG. 27A–L )

Sharp, 1874: 47 ( Philonthus ; type locality: Nagasaki, eastern Siberia, Lake Baikal); Matsumura, 1911: 114 ( Philonthus , Japan); Bernhauer & Schubert, 1914: 354 ( Philonthus , catalogue); Scheerpeltz, 1933: 1359 ( Philonthus , catalogue); Adachi, 1937: 56 ( Philonthus, Izu-Oshima ); Nakane, 1963: 91 ( Philonthus , habitus photograph, Japan); Watanabe & Shibata, 1972: 64 ( Philonthus , Yaku-shima Island); Yuh et al., 1985: 242 ( Philonthus , Korea); Herman, 2001: 2949 ( Philonthus , world catalogue); Smetana, 2004: 649 ( Philonthus , catalogue for Palaearctic region); Hayashi, 2008: 149 ( Pseudohesperus ).

Synonym: Hesperus tokyanus R. Dvorák, 1957: 9 (type locality: Mount Takar, Tokyo, Japan); Hayashi, 2008: 149 (synonym of Pseudohesperus rutiliventris ( Sharp, 1874)) .

Examined material: China: Beijing: 3 ♂♂, 25 ♀♀, Xiaolongmen (39°58′N, 115°28′E), 1140–1270 m asl, 14.vi.-2.vii.2000, Yu Xiaodong collected (IZ-CAS) ; 1 ♂, 1 ♀, Xiaolongmen (39°58′N, 115°28′E), 19.vi.1999, Yu Xiaodong collected (IZ-CAS) ; 3 ♀♀, Xiaolongmen (39°58′N, 115°28′E), 25.vi.2006, Chen Yongjie collected (IZ-CAS) ; 1 ♀, Xiaolongmen (39°58′N, 115°28′E), 20.vii.1999, Zhou Hongzhang collected (IZ-CAS) ; Shaanxi: 2 ♀♀, Taibaishan (33°57′N, 107°45′E), 1800 m asl, 8.vi.2007, Zhou Hongzhang collected (IZ-CAS) ; Jilin: 1 ♂, 1 ♀, Changbaishan (41°34′N, 126°27′E), 900–1800 m asl, 11.vii.1987 (IZ- CAS) ; Ningxia: 3 ♂♂, 7 ♀♀, Liupanshan (35°39′N, 106°17′E), 1990–2100 m asl, 27–28.vi.2008, Zhou Haisheng & Zhao Zongyi collected (IZ-CAS) ; Japan: Osaka: 1 ♀, Mt. Nose , 11.vi.1967, S. Nishina collected (CHH) ; Iwate: 1 ♂, Takizawa-mura , 7.viii.1970, J. Kamei collected (CHH) ; Ishikawa: 1 ♂, Kanazawashi: Mt. Noda , 24.x.1970, Y. Hayashi collected (CHH) .

Description: Head and pronotum black, shining. Antennae black-brown. Elytra and scutellum black. Abdomen black with strongly iridescent lustre. Mandibles, maxillary and labial palpi reddish-brown. Legs reddish-brown or dark brown.

Body 8.73–10.5 mm long (HPL: 2.77–2.94 mm). Head of rounded quadrangular shape, 1.06–1.14 mm long, 1.22–1.31 mm wide, slightly wider than long (HW: HL = 1.07–1.23). Tempora 0.25–0.33 mm long, almost evenly rounded, densely and coarsely punctate; eyes moderately large, slightly prominent, 0.41– 0.49 mm long, 1.25–1.66 times as long as tempora. Dorsal surface of head with moderately numerous, large setiferous punctures, becoming sparser toward vertex; vertex largely impunctate. Entire head with distinct and dense microsculpture of transverse waves. Antennae long, antennomere I very long, distinctly thickened towards apex, antennomere III much longer than antennomere II, following antennomeres gradually decreasing in length, but all distinctly longer than wide, antennomere XI obliquely truncated.

Pronotum slightly narrowed anteriad, 1.55– 1.71 mm long, 1.55–1.71 mm wide, slightly wider than head (PW: HW = 1.19–1.33), densely and finely punctate, punctures separated by three to five times their diameter, narrowly impunctate along midline; microsculpture fine, similar to that on head.

Elytra 1.80–1.96 mm long, 2.12–2.28 mm wide, along sides about 1.16–1.21 times as long as pronotum, densely and finely punctate, punctures separated about one puncture diameter. Scutellum large, triangular, densely and finely punctuate.

Abdomen a little narrowed posteriad, widest 1.88– 2.04 mm, finely and densely punctate, punctures separated by two to three times their diameter at base on tergites III–V and punctures separated by less than one puncture diameter at base on tergites VI–VII, punctation gradually becoming sparser toward apex of each tergite; tergites III–V with two basal carinae, elevated area between basal carinae densely and coarsely punctate.

Male: Tergite VIII with arcuate apex ( Fig. 27J ). Sternite VIII with moderately wide, obtusely triangular medioapical emargination, partly filled by semimembranous extension ( Fig. 27F ). Genital segment with stylus of tergite IX simple, densely setose apically ( Fig. 27G ). Sternite IX with asymmetrical basal portion, apex deeply emarginate, each lobe prolong, forming modified rod-like extensions ( Fig. 27E ). Tergite X triangular, widely emarginate at apex, with variable number of apical setae ( Fig. 27L ).

Aedeagus with median lobe slightly exceeding paramere, narrowed into subrounded apex ( Fig. 27A ); in lateral view, apical portion distinctly bent dorsad (parameral side) ( Fig. 27B ); paramere slightly narrower median lobe, narrowed into obtusely rounded or subtruncated apex, face adjacent to median lobe with peg setae irregularly arranged along apical portion of paramere ( Fig. 27C, D ).

Female: Sternite VIII with arcuate apex, lacking medioapical emargination ( Fig. 27K ). Genital segment with second gonocoxites moderately long, each with minute stylus bearing two long apical setae ( Fig. 27H ). Tergite X triangular, subrounded at apex, with variable number of apical setae ( Fig. 27I ).

Distribution: Russia, China (Beijing, Jilin, Ningxia, Shaanxi), Korea, Japan.

Remarks: Sharp (1874) described Philonthus rutiliventris from Russia and Hayashi (2008) transferred it to the genus Pseudohesperus . Our specimens agree well with Hayashi’s material (CHH). Pseudohesperus rutiliventris ( Sharp, 1874) is closely related to P. cf. eustilbus ( Kraatz, 1859) and P. sparsipunctatus Li & Zhou sp. nov. Pseudohesperus rutiliventris can be easily distinguished from the latter two species by head and pronotum with distinct and profound microsculpture and different aedeagus (head and pronotum without microsculpture in the latter two species). This species is reported from China for the first time.

Figures

Figure 27. Pseudohesperus rutiliventris (Sharp). A, aedeagus, dorsal (parameral side) view; B, median lobe of aedeagus, lateral view; C, D, underside of paramere; E, sternite IX of male; F, sternite VIII of male; G, stylus of tergite IX of male; H, gonocoxites of genital segment of female; I, tergite X of female; J, tergite VIII of male; K, sternite VIII of female; L, tergite X of male. Scale bars = 0.5 mm.