Glischrochilus (Librodor) egregius ( Grouvelle, 1892 )

Jelínek, Josef & Hájek, Jiří, 2018, Two new species of Glischrochilus with taxonomic comments, new records from Asia, and a world checklist of the genus (Coleoptera: Nitidulidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 58 (2), pp. 567-576 : 572-573

Glischrochilus (Librodor) egregius ( Grouvelle, 1892)

Librodor egregius Grouvelle, 1982: 856 (original description; Burma: Carin Cheba).

Glischrochilus egregius: GROUVELLE (1913) : 187 (new combination).

Cephalips egregius: ARROW (1937) : 101 (new combination).

Glischrochilus (Librodor) egregius: JELÍNEK (1975) : 136 (new subgeneric assignment).

Glischrochilus (Librodor) egregius cyclops Jelínek, 1975: 137 (original description; China: Tienmuschan), syn. nov.

Glischrochilus (Librodor) egregius monticola Jelínek, 1975: 137 (original description; Sikkim: Darjeeling: Gopaldhara: Rungbong valley), syn. nov.

Type material. Glischrochilus egregius cyclops . HOLOTYPE and 3 PARA- TYPES ( NMPC), labelled: ‘Tienmuschan / N.W. China Rtt. [p]’.

Glischrochilus egregius monticola . PARATYPE: 1 spec. ( NMPC), labelled: ‘Kurseong [hw]’.

Additional material studied. CHINA: GUANGXI A. R.: Maoer Shan, 25°52N, 110°29E, 2000–2200 m, (valley with springs in primary forest, extremely wet, partly swampy), 28.v.–9.vi.2009, C. Reuter lgt., l ♀ ( NKME). HUNAN PROV.: Wuling Shan, Zhangjiajie, 29.4N, 110.4 E, 700 m, 4.–7.vii.2003, J. Turna lgt., 3 spec. ( NMPC). YUNNAN PROV.: Jinghong env., 21°55.785′N, 100°47.032′E, 600 m, 12.vi.2006, R. Novak lgt., 1 spec. ( VKCZ). LAOS: BOLIKHAMSAY PROV.: Ban Nape – Kaew Nua Pass, 18°22.3′N, 105°09.1′E, 600± 100 m, 18.iv.–1.v.1998, E.Jendek & O.Šauša lgt., 1J ( NMPC). HOUAPHANH PROV.: Phou Pane Mt., 20°13′09–19″N, 103°59′54″– 104°00′03″E, 1480–1510 m, 2.–22.vi.2011, V. Kubáň lgt., 1 ♀ ( NMPC). LUANG NAMTHA PROV.: 20 km NW Louang Namtha, 21°09.2′N, 101°18.7′E, 900± 100 m, 24.–30.v.1997, E.Jendek & O. Šauša lgt., 1 ♀ ( NMPC). VIANGCHAN PROV.: Vang Vieng env., 11.–27.ix.2017, A.Azarov lgt., 1J ( ALCB). NEPAL: Birethanti-Gorepani, 4.–9.vi.1992, I. Jeniš lgt., 3 ♀♀ ( NMPC). THAILAND: CHIANG MAI PROV.: Chiang Dao Hill Res., 19°33′N, 99°04′E, 494 m, 1.vii.2017, A. Prosvirov lgt., 1 J, 1 ♀ ( ALCB). MAE HONG SON PROV.: Soppong, Pai, 28.v.–5.vi.1997, M. Snížek lgt., 1 ♀ ( NMPC). VIETNAM: HOA BINH PROV.: Hoa Binh, 4.–7.vi.1986, J. Horák lgt., 1 ♀ ( NMPC). LAO CAI PROV.: Hoang Lien Son Distr., Sa Pa, 1600 m, 11.–16.v.1990, J. Horák lgt., 1 ♀ ( NMPC).

Comments to classification. ARROW (1937) proposed the genus Cephalips Arrow, 1937 for this species with striking sexual dimorphism. JELÍNEK (1975) classified G. egregius within the subgenus Librodor and thus established informal synonymy of both taxa. Subsequently, JELÍNEK (1982) described G. (Cephalips) rufocapillatus Jelínek, 1982 from southern India and revalidated Cephalips as a subgenus of Glischrochilus (see also JELÍNEK & AUDISIO 2007). However, KIREJTSHUK (2008) mentioned, without any comments, Cephalips again as a synonym of Librodor . As the significance of sexual characters for the diagnosis of the genus-level taxa is debatable, we prefer to place the species in the subgenus Librodor and maintain Cephalips as a synonym of Librodor in accordance with JELÍNEK (1975) and KIREJTSHUK (2008).

JELÍNEK (1975) distinguished three subspecies, based on colour pattern. Examination of a more extensive material revealed that especially the extent of black pigmentation on elytra is subject to variation independent of geographic origin. Thus the concept of several subspecies is not justified and must be abandoned (as already published without explanations in JELÍNEK & AUDISIO (2007)). Therefore, we establish the following formal synonymies: Glischrochilus egregius ( Grouvelle, 1892) = G. egregius cyclops Jelínek, 1975 , syn. nov. = G. egregius monticola Jelínek, 1975 , syn. nov.

Distribution. A widespread species known from northern India (Sikkim), southern Myanmar (Tenasserim) and eastern China (Zhejiang province). The distribution in Hunan province (China) and in Nepal in JELÍNEK & AUDISIO (2007) is based on unpublished data listed above. The record from Xinjiang (‘XIN’) in JELÍNEK & AUDISIO (2007) is a misprint. New species for Laos, Thailand and Vietnam.