Pterostichus (Feroperis) acutidens (Fairmaire, 1889)

Sun, Xiaojie, Shi, Hongliang, Sang, Weiguo & Axmacher, Jan Christoph, 2018, Two new species of Feroperis Lafer (Carabidae, Pterostichus) from China, with a key to all known Chinese species in this subgenus, ZooKeys 799, pp. 95-114 : 95

Pterostichus (Feroperis) acutidens (Fairmaire, 1889) Fig. 14A

Omaseus acutidens Fairmaire, 1889: cc (original: Omaseus ; syntype in Muséum National d’Histoire Naturelle, Paris, France; type locality: “Pékin”); Jedlička 1962: 251; Lafer 1979: 8.

Type locality.

Beijing.

Type material examined.

Syntype of Omaseus acutidens Fairmaire, 1 male (MNHN), "Omaseus / acutidens / Fairm. / Pekin"; “SYNTYPE” [red label]; "Omaseus / acutidens / Fairmaire / Det. Shi H.L. 2011"; “Muséum Paris / 1906; Coll. Léon Fairmaire".

Other material examined.

7 specimens (IZAS), "China, Hebei Province, Xinglong County, Wuling Mountain. 1994.V.23, YU Peiyu"; 5 specimens (IZAS), "China, Beijing, Huairou District, Yunmeng Mountain. 800 m, 2005.VII.13, LIU Ye"; 628 specimens (IZAS), "China, Beijing, Dongling Mountain. Pit fall trap, 1160-1410 m, 2011.VI.10-2012.IX.13, ZOU Yi".

Diagnosis.

Body length 14-17 mm, blackish, elytra shiny without metallic lustre. Pronotum subcordate, widest at approximately anterior 2/5; lateral margins of pronotum strongly constricted to the base; posterior angles strongly protruding and forming very strong denticles, lateral border at the posterior denticles strongly widened, at least twice as wide as the lateral broder anterior to the posterior angles; lateral border not interrupted before posterior denticles; basal foveae with a few large punctures. Elytra with humeral teeth faint; the third interval usually with 3-4 setigerous pores close to the second stria, but position variable. Apical lamella of aedeagus approximately triangular, gradually narrowed to apex, apex not widened or thickened; in lateral view, apical lamella distinctly bent downwards. Right paramere long and bent, apex distinctly compressed.

This species can be distinguished from all the other species of the subgenus by its male genitalia: aedeagus with apical lamella simple and distinctly bent downwards. From the external appearance, this species is superficially similar to P. jungens Tschitschérine, 1893; they can be distinguished by: the pronotal lateral channel before posterior angles wider in P. acutidens than in P. jungens ; and quite different shape of apical lamella of aedeagus.

Distribution.

This species is only known from Beijing and adjacent regions in the north part of Hebei Province.