Bolitogyrus depressus, 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 : 454-455

Bolitogyrus depressus sp. nov.

( Figs. 1, 1-1 )

Type material. Holotype ♂, CHINA: Guangdong Province: Shaoguan City, Ruyuan County, Nanling National Forest Park, 24. VII. 2008.

Description. Head black, with slight metallic hue; pronotum black, with explanate margin reddish brown; scutellum with color similar to pronotum; elytra black, with a wide oblique reddish brown macula in basal half from humeral angle but not reaching suture, with posterior sutural area and posterolateral angle reddish brown; abdomen almost entirely dark brown, tergites III–V strongly iridescent; antennae pale brown, with antennomere I paler, labrum and mandibles dark reddish brown, maxillary and labial palpi pale brown; legs yellowish brown, with middle portion of fore femora dark brown, apical portion of hind femora dark brown ventrally.

BL = 11.3 mm, BW = 2.4 mm, HL/PL/EL = 1.00: 1.23: 1.56, HW/PW/EW = 1.00: 1.09: 1.32

Head ( Fig. 1 A) round, wider than long, in dorsal view HW/HL = 1.25, HEL/HTL = 7.42; frons with shallow, Y-shaped impression; three setiferous punctures along medial margin of eye between anterior and posterior frontal setiferous punctures; posterior frontal setiferous puncture situated anterior to level of posterior margin of eye, separated from posteriomedial margin of eye by a distance shorter than the diameter of the puncture; temporal setiferous puncture situated very close to posterior margin of eye, separated by a distance equal to the diameter of the puncture; dorsal surface sparsely and moderately deeply punctate.

Pronotum ( Fig. 1 B) wider than long, PW/PL = 1.11, moderately narrowed anteriorly, lateral and posterior margins broadly rounded; posterolateral and posterior margins moderately explanate; one setiferous puncture in each dorsal row, situated close to anterior margin; large lateral setiferous puncture with socket touching marginal groove; surface strongly polished, without microsculpture, only sparsely and extremely shallowly punctate near anterior angle.

Elytra ( Fig. 1 C) slightly wider than long, EW/EL = 1.06, ESL/EL = 0.56, slightly broadened posteriorly; surface unevenly covered with moderately dense and coarse punctures, slightly denser around basal sutural area; surface between punctures without microsculpture. Hind wings fully developed.

Abdominal tergites III–V with middle portion almost impunctate, with transverse depressions at base, punctures before depressions distinctly coarse and dense; VI with basal area only vaguely depressed, with punctures in middle portion distinctly sparser than adjacent areas; VII–VIII finely punctate, without transverse depression; VII with whitish apical seam of palisade fringe.

Male with first four segments of foretarsus strongly dilated, sub-bilobed; segment two about as wide as apex of tibia; tergite VIII ( Fig. 1-1 A) with basal ridge complete, arched backward into sharp angle in middle; sternite VIII ( Fig. 1-1 B) with three long setae on each side, apical margin with a shallow and very narrow middle emargination, with a small area around the emargination impuncate; sternite IX ( Fig. 1-1 C) with basal portion very short and wide, apical margin with a deep emargination, with one long seta on each side; tergite X ( Fig. 1-1 D) with basal side broadly concave, apical margin widely rounded; aedeagus in lateral view ( Fig. 1-1 E) with apex of paramere not reaching that of median lobe, median lobe somewhat swollen at about apical 1/5 toward parameral side, with apex slightly bent toward paramere; aedeagus in parameral view ( Fig. 1-1 F) with paramere elongate, gently narrowed at about basal third, and then gradually widened, apical third gradually narrowed into rounded apex ( Figs. 1 D, 1-1G); median lobe from base to apex nearly parallel-sided, almost as wide as paramere, inconspicuously dilated laterally below apex to be wider than paramere, and then abruptly constricted into small and narrow apex ( Figs. 1 E, 1-1H); apical margin of paramere with four to five apical setae on each side, underside covered with numerous sensory peg setae, two groups along lateral sides, joining at apex, other two medial groups generally forming two parallel longitudinal lines along midline ( Figs. 1 D, 1-1G).

Female unknown.

Distribution. Bolitogyrus depressus sp. nov. is known only from the type locality in the north of Guangdong Province: Nanling National Forest Park. The specimen was collected in July.

Diagnosis. This new species is similar to B. pictus Smetana and Zheng in all aspects. But it can be distinguished from the latter by having the pronotum black, the abdomen almost entirely dark brown, the paramere of aedeagus with the apex not reaching that of the median lobe, and the median lobe with a small and narrow apex; whereas B. pictus Smetana and Zheng has the pronotum and the abdomen from tergite III to the basal portion of tergite VI reddish brown, the paramere of aedeagus with the apex protruding slightly beyond that of the median lobe, and the median lobe with an obtuse apex.

Etymology. The specific name is from the Latin adjective depressus (low), referring to the depressions on abdominal tergites III–V.

Figures

FIGURE 1. Bolitogyrus depressus 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).