Deleaster pekinensis Fairmaire, 1893

Wang, Lin-Fei & Lü, Liang, 2021, Review of the Chinese species of Deleaster Erichson, 1839 (Coleoptera, Staphylinidae, Oxytelinae) with a mitogenome of Deleaster bactrianus Semenov, 1900, Zootaxa 5027 (3), pp. 301-331 : 307-308

Deleaster pekinensis Fairmaire, 1893 [ṇ寻ƫ隐翅*]

( Fig. 2 )

Fairmaire, 1893: ccxii (Type locality: Peking [北ṙ]); Bernhauer & Schubert, 1911: 88 (catalogue); Herman, 1970: 365; Herman, 2001: 1326 (catalogue; distribution); Löbl & Smetana, 2004: 512 (Palaearctic catalogue; distribution); Schülke & Smetana, 2015: 768 ( Deleaster ; Beijing, Liaoning, Shaanxi).

Material examined. CHINA, Beijing: 1ex., Mt. Baihua [百ƫ山], 23.VIII.1973, leg. Yin-Heng Han [韩寅ẇ] (IZ-CAS) . CHINA, Shaanxi, Ningshan [•ka]: 1♂, Huodigou [火地沟], 1580–2000m, 18.VIII.1998, leg. De- Cheng Yuan [t德¢] (IZ-CAS); 1♀, Huoditang [火地¬], 1580m, light trap, 14.VIII.1998, leg. De-Cheng Yuan (IZ-CAS); 1♀, Huoditang, 1580m, light trap, 7.VII.1999, leg. De-Cheng Yuan (IZ-CAS) .

Redescription. Body ( Fig. 2A ) black, glossy, with dense short pubescence. Pronotum black. Elytra dark brown to nearly black, with reddish tinge at middle of elytral suture, black on apical portions. Legs bright orange to testaceous. Lateral portions of abdomen reddish brown. Body length: 7.8–8.8 mm.

Male: Head transverse ( Fig. 2B ), broader than pronotum, sparsely pubescent and punctate. Clypeus rectangular, with sparse setae, anterior margin broadly rounded. Epistomal suture straight, deeply sulciform, equal to level of anterior margin of supra-antennal ridge. Front with no microsculpture. Vertex strongly elevated and laterally delimited by U-shaped impression. Occipital suture gently curved with pit in middle. Temples considerably shorter than eyes. Antennae with article 3 as long as 1, and both longer than others.

Pronotum ( Fig. 2B ) roughly as long as wide, broadest at near anterior 1/4 and narrowed posteriorly with lateral margins slightly arcuate; middle portion of pronotum distinctly elevated narrower than 1/3 of wide, sparsely pubescent and punctate with no microsculpture, surrounded with four broad impressions covered with coarse microsculpture; two elevated tubercles near posterior angles; mid-longitudinal suture feeble, evanescent in basal impression. Scutellum pubescent on coarse surface, with scutiform depression.

Elytra ( Fig. 2B ) large and wide, covered by short pale pubescence. Legs ( Fig. 2A ) slender, tarsal formula 5-5-5, tarsomeres 1–4 expanded and padded with fine hairs. Fifth tarsomere as long as previous together.

Abdomen coriaceous without puncture. Tergites II–VII without basolateral ridges, with a pair of laterosternites on each segment. Tergite VIII with apical margin straight and pectinate in middle ( Fig.2C ). Sternite VIII with posterior margin broadly emarginated ( Fig. 2E ). Sternite IX undivided Fig. 2G .

Aedeagus ( Fig. 2I–L ) with median lobe oblong in ventral view, parameres stick-like, with apical 1/2 plump and curved.

Female: similar to male, but much larger in size; first four tarsomeres of protarsi simple, not so dilated as male; sternite VIII with posterior margin broadly round and obtusely bended in middle ( Fig. 2F ); sternite IX divided ( Fig. 2H ).

Remarks. Similar to D. dichrus , but different as follows: body much bigger (7.8–8.8 mm versus 6.5–8.0 mm in D. dichrus ) and elevated portion much heavier; body black and glossy; pronotum black, with basal impression much deeper; elytra dark brown to nearly black, with reddish tinge (in D. dichrus testaceous to rufotestaceous), black on apical portions, with bifurcation of suture rounder.

Distribution: China (Beijing, Liaoning, Shaanxi).

Figures

FIGURE 2 Deleaster pekinensis Fairmaire: A, habitus ♀; B, head and pronotum ♀; C, tergite VIII ♂; D, tergite VIII ♀; E, ster- nite VIII ♂; F, sternite VIII ♀; G, abdominal segment IX–X ♂ (ventral view); H, abdominal segment IX–X ♀ (ventral view); I, aedeagus (ventral view); J, aedeagus (dorsal view); K, aedeagus (lateroventral view); L, aedeagus (lateral view). Scales: A = 3 mm; B = 1 mm; rest, 0.3 mm.