Erymus gracilis ( Fauvel, 1895 )

Zhou, Yu-Lingzi & Zhou, Hong-Zhang, 2014, Taxonomy of the genus Erymus Bordoni (Coleoptera: Staphylinidae, Staphylininae, Xantholinini) in China with descriptions of two new species, Zootaxa 3814 (4), pp. 521-536 : 532-533

4. Erymus gracilis ( Fauvel, 1895)

( Fig. 2 A)

Fauvel, 1895: 240 ( Leptacinus ;

Type locality: Bírmanie, Carin Asciuii Ghécu, 1400–1500 m; Java occidental, Pengalengan, 1300 m);

Fauvel, 1904: 56 (Nilghiris; Bírmanie; Java); Bernhauer and Schubert, 1914: 293 (catalog); Cameron, 1932: 9 (characters; Burma; Assam; India); Scheerpeltz, 1933: 1301 (catalog); Scheerpeltz, 1957: 233 (Sumba); Scheerpeltz, 1976: 85 ( Nepal); Coiffait, 1982: 240 (characters); Herman, 2001: 3675 (world catalog); Bordoni, 2002: 560 ( Erymus ; characters; Guangxi, Hongkong, Zhejiang); Biswas, 2003: 269 ( Leptacinus ; first record in Sikkim; key to species); Bordoni, 2003: 263 ( Erymus ); Smetana, 2004: 690 ( Leptacinus ; catalog); Bordoni, 2007: 68 ( Erymus ; catalog); Bordoni, 2009: 100 ( Malaysia); Bordoni, 2011: 26 ( Taiwan); Bordoni, 2012b: 35 ( Thailand); Bordoni, 2012c: 112 ( Laos).

Syn.: Leptacinus circumcaspicus Gusarov, 1993: 70

(Type locality: Turkmenistan: Ashgabat Prov.: 25 km. W Bakharden, Karayalchi);

Herman, 2001: 3671 (world catalog); Bordoni, 2002: 560 (synonym of Erymus gracilis ); Smetana, 2004: 690 (catalog; synonym of Leptacinus gracilis ).

Leptacinus nilamburensis Cameron, 1932: 10

(Type locality: India, Madras: Nilambur);

Scheerpeltz, 1933: 1302 (catalog); Herman, 2001: 3679 (world catalog); Bordoni, 2002: 560 (synonym of Erymus gracilis ); Smetana, 2004: 690 (catalog; synonym of Leptacinus gracilis ).

Leptacinus notabilis Cameron, 1926: 342

(Type locality: India: Chakrata District; Sijla Gad, 5000 feet);

Cameron, 1932: 11 (characters; India); Scheerpeltz, 1933: 1302 (catalog); Coiffait, 1982: 241 (characters); Herman, 2001: 3679 (world catalog); Bordoni, 2002: 560 (synonym of Erymus gracilis ); Smetana, 2004: 690 (catalog; synonym of Leptacinus gracilis ).

Material examined: male, with labels as follows:“ Erymus , gracilis (Fvl.) , Bordoni det. 1998 ”/ “ THAILAID: Chiang Mai, Doi Angkhang 10km W, Fang 1500 m 20.III.87, P. Schwendinger ” ; female, with labels as follows:“ Erymus , gracilis (Fvl.) , Bordoni det. 1998 ”/ “ INDIA Kerala, Cardamon H. n°48, Muttapotti près Munnar , 24-XI-72 1700 m, Besuchet Löbl Mussard ”/ “ Leptacinus , spec., det. M. Uhlig 1982”. ( MHNG)

Measurements. BL= 4.08 mm, FL= 2.21 mm, HL= 0.65 mm, HW= 0.51 mm, PL= 0.71 mm, PW= 0.49 mm, EL= 0.77 mm, EW= 0.70 mm.

Body nearly cylindrical, small-sized. Body dark brown, except maxillary palpi, labial palpi, legs and last abdominal segment lighter.

Head ( Fig. 1 A). Subrectangular (HL to HW ratio 1.3), widest at mid-length of eyes, tempora substraight, posterior angles rounded. Dorsal integument glossy, without any micropunctures and microsculpture; median longitudinal region (of the width ≈ 0.15 mm) smooth, without punctures, other surface (posterior half of head and temporal region) with deep, sparsely-scattered, medium sized punctures, distance between punctures about the diameter of 2–3 punctures; each deflexed portion of tempora with two rows of larger and deeper punctures. Each side of cranium with anterolateral puncture near antennal insertion, midlateral puncture adjacent to dorsal margin of eye. Frontal furrows deep and long, fused with two paired tiny punctures, reaching line connecting midth of each eye. Anteocular furrows indistinct. Eyes large, distinctly longer than half length of tempora (eye: tempora = 0.20: 0.34 mm), distinctly protruding laterad. Epistoma relatively narrow, narrowed forwards. Distance between antennal insertions 0.17 mm, longer than distance from antenna to eye (0.10 mm).

Antennae. Scape stout, thickened apically, subequal to length of three subsequent antennomeres combined, 0.22 mm; antennomere II dilated subapically, 0.12 mm; III spherical and small, much shorter than II, 0.05 mm; IV and V obviously wider than III, subequal in length of 0.05 mm; last antennomere medium in length, 0.14 mm, longer than length of two preceding antennomeres combined.

Neck. Medium width (0.19 mm), slightly wider than 1/3 of head width.

Pronotum ( Fig. 1 A). Subrectangular, distinctly elongate (PL to PW ratio 1.5), same width of head but slightly longer. Widened anteriad, lateral margins sinuate, anterior angles rounded, posterior angles broadly rounded, with widest at anterior 1/3 and narrowest at posterior 1/3. Dorsal surface glossy, without any micropunctures and microsculpture. Each side bearing a paired admedian row of 5–6 punctures, a paired lateral row of 5–6 punctures, and also with a few irregular punctures distributed near anterior margin.

Mesoscutellum. Glossy, with little microsculpture, and with a pair of small punctures at apical 1/3.

Elytra ( Fig. 1 A). Subquadrate (EL to EW ratio 1.1), slightly longer than pronotum, but distinctly wider. Humeri well-developed, lateral margins distinctly dilated outwards, hind margin distinctly rounded. Integument glossy, flattened, without microsculpture, each side with 2–3 rows of small punctures along median suture, a row along midwidth, and also with 1–2 rows of tiny punctures on deflexed portion.

Abdomen. Cylindrical, broadest at segment VI. Tergites III–VII glossy, each segment covered with obvious transverse microstriae, also with small scattered punctures, interspaces between punctures about the diameter of 3–4, and punctures denser on tergites VI and VII. Each tergite with a shallow basal impression near anterior margin; surface between two basal transverse carinae glossy, covered with obvious microstriae and few punctures. All abdominal sternites glossy, with microstriae and punctures as those on tergites.

Distribution. China (Zhejiang, Guangxi, Hongkong, Taiwan); Sri Lanka, India, Bhutan, Thailand, Malaysia, Laos, Indonesia, Burma, Nepal.

Remarks. This species is distinguished from its congeners by the combination of the following characters: body color darker, shape of epistoma, male tergite X and aedeagus.

Figures

FIGURE 1. Forebody: A. Erymus gilvus sp. n.; B. E. wufengensis sp. n.; C. E. dalianus Bordoni. Scale bars 0.30 mm.

FIGURE 2. Forebody: A. Erymus gracilis (Fauvel); B. E. paramerum Bordoni; C. E. sinicus Bordoni. Scale bars 0.30 mm.