Bolitogyrus uncus, Cai, Yan-Peng, Zhao, Zong-Yi & Zhou, Hong-Zhang, 2015

Cai, Yan-Peng, Zhao, Zong-Yi & Zhou, Hong-Zhang, 2015, Taxonomy of the genus Bolitogyrus Chevrolat (Coleoptera: Staphylinidae: Staphylinini: Quediina) from China with description of seven new species, Zootaxa 3955 (4), pp. 451-486 : 472-475

Bolitogyrus uncus sp. nov.

( Figs. 7, 7-1 )

Type material. Holotype ♂, CHINA: Yunnan Province: Baoshan City, Tengchong County, Jietou Datang, Longtanghe (25°45′N, 98°42′E), 2080 m, 16. V. 2006, coll. Hongbin Liang and C. L. Li.

Description. Forebody black, with vague greenish metallic hue; abdomen almost entirely dark brown, with posterior margin of every tergite slightly paler; antennae brown, with antennomere I paler, labrum and mandibles dark reddish brown, maxillary and labial palpi brown; legs brown.

BL = 9.0 mm, BW = 2.2 mm, HL/PL/EL = 1.00: 1.20: 1.55, HW/PW/EW = 1.00: 1.12: 1.35

Head ( Fig. 7 A) round, wider than long, in dorsal view HW/HL = 1.20, HEL/HTL = 6.51; frons with ill-defined V-shaped shallow impression; three setiferous punctures along medial margin of eye between anterior and posterior frontal setiferous punctures; posterior frontal setiferous puncture situated slightly anterior to level of posterior margin of eye, separated from posteriomedial margin of eye by a distance equal to the diameter of the puncture; temporal setiferous puncture touching posterior margin of eye; dorsal surface unevenly and coarsely punctate.

Pronotum ( Fig. 7 B) wider than long, PW/PL = 1.12, slightly narrowed anteriorly, lateral and posterior margins broadly rounded; posterolateral and posterior margins narrowly explanate; two setiferous punctures in each dorsal row, one situated close to anterior margin, the other slightly behind middle; large lateral setiferous puncture with socket not touching marginal groove; disc of pronotum shallowly and moderately punctate, distinctly denser and coarser near anterior angle, surface without microsculpture.

Elytra ( Fig. 7 C) slightly wider than long, EW/EL = 1.04, ESL/EL = 0.58, slightly broadened posteriorly; surface covered with dense and coarse punctures; surface between punctures without microsculpture. Hind wings fully developed.

Abdominal tergites III–VI with middle portion almost impunctate, with transverse depressions at base, punctures before depressions distinctly coarse and dense; VII–VIII sparsely punctate, without transverse depression; VII with whitish apical seam of palisade fringe.

Male with first four segments of foretarsus moderately dilated, sub-bilobed; segment II about as wide as apex of tibia; tergite VIII ( Fig. 7-1 A) with basal ridge complete, arched backward forming a sharp angle in middle; sternite VIII ( Fig. 7-1 B) with two long setae on each side, apical margin with a very shallow and inconspicuous emargination, with a small area around the emargination impuncate; sternite IX ( Fig. 7-1 C) with basal portion very short and wide, apical margin with a wide and moderately deep emargination, with one long seta on each side; tergite X ( Fig. 7-1 D) with basal side broadly and shallowly concave, apical margin widely rounded; aedeagus in lateral view ( Fig. 7-1 E) with apex of paramere at the same level of that of median lobe, median lobe with one medioapical carina and two tiny hook-shaped processes on either side ( Figs. 7 E, 7-1H); aedeagus in parameral view ( Fig. 7-1 F) with paramere moderately narrowed in middle, apical 1/4 dilated forming subtriangular apical portion ( Figs. 7 D, 7-1G); median lobe almost gradually narrowed throughout length, then abruptly constricted forming an obtuse subtriangular apex ( Figs. 7 E, 7-1H); apical margin of paramere with four apical setae in a cluster at middle and two long subapical setae on each side, underside covered with numerous sensory peg setae, two groups along apex and lateral sides, another two medial groups with posterior portion somewhat spread laterally ( Figs. 7 D, 7-1G).

Female unknown.

Distribution. Bolitogyrus uncus sp. nov. is known only from the type locality in the west of Yunnan Province: Tengchong County (Jietou Datang, Longtanghe), at a high altitude of 2080 m. The specimen was collected in May.

Diagnosis. This new species is very similar to B. electus Smetana & Zheng in both appearance and male genitalia. It can be distinguished from the latter by having the paramere with a subtriangular apical portion reaching the same level of the apex of the median lobe, whereas B. electus Smetana & Zheng has the paramere with a lanceolate apical portion distinctly protruding beyond the apex of the median lobe.

Etymology. The specific name is from the Latin noun uncus (a hook), referring to the hook-shaped processes on the lateral sides of the median lobe.

Figures

FIGURE 7. Bolitogyrus uncus sp. nov.: A, head (1.0 mm); B, pronotum (1.0 mm); C, elytra (1.0 mm); D, underside of paramere (0.2 mm); E, apical portion of median lobe, parameral view (0.2 mm). (Scale lengths in parentheses).