Bolitogyrus vulneratus (Fauvel, 1878)

Brunke, Adam J., 2017, A revision of the Oriental species of Bolitogyrus Chevrolat (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 664, pp. 1-97 : 42-44

Bolitogyrus vulneratus (Fauvel, 1878) Figs 13 H–K, 22A (map)

Cyrtothorax vulneratus Fauvel, 1878: 165.

Bolitogyrus vulneratus : Smetana 1988, misidentification of B. himalayicus Brunke.

Type locality.

Cochinchina [=Southeast and Mekong River Delta regions], Vietnam.

Type material.

Cyrtothorax vulneratus Fauvel, 1878.

Holotype (♀, IRSNB): Cochinchine [written] / Tonkin museum [written] / vulneratus FvL. [written] / TYPE [pink, printed] / R. I. Sc. N. B., 17.479, Cyrtothorax , Coll. et det A. Fauvel [printed] / HOLOTYPE Cyrtothorax vulneratus Fauvel, 1878 Det. A. Brunke 2017 [red label] / AJB0000420 [identifier label].

Other material.

VIETNAM: Quang Binh: 'mountains SW of Dong Hoi’ [translated from Cyrillic], 100m, 20-III-1963, Kabakov, AJB0000421, 1 ♂ (ZIN).

Diagnosis.

This species may be recognized by the following: head entirely dark; pronotum widest in posterior third; elytra partly dark, discal markings of elytra extending onto epipleuron, not forming v-shape, medial and lateral markings not entirely fused (Fig. 5G); apex of hind femur with only ventral half darkened (as in Fig. 2C); antennomere 7 distinctly transverse (Fig. 6F); median lobe in lateral view ventrally produced and hooked, without basal teeth (Fig. 13J).

Redescription.

Measurements ♂ (n = 1): HW/HL 1.50; PW/PL 1.23; EW/ EL 1.21; ESut/PL 0.74; PW/HW 1.05; forebody length 4.2 mm.

Measurements ♀ (n = 1): HW/HL 1.46; PW/PL 1.30; EW/EL 1.25; ESut/PL 0.78; PW/HW 1.08; forebody length 4.3 mm.

Coloration: head, pronotum and abdomen entirely dark; elytra with raised median marking oval-shaped and larger than raised lateral marking, markings connected, pale area extended onto epipleuron, epipleuron pale, pale area varying from near humerus to basal half; scutellum dark; antennomere 1 yellow with darkened apex, 2-5 reddish, 6-10 dark brown, 11 either dark brown or vaguely paler; palpi yellow with apical segment slightly darker; legs yellow, hind femur with small ventroapical dark marking.

Head strongly transverse, dorsal surface with dense, clearly separated asetose punctures, frons with few scattered punctures and deep, coarse Y-shaped impression. Antennomeres 6-10 distinctly transverse and 8-10 slightly asymmetrical.

Pronotum distinctly transverse, slightly wider than head, center of disc almost entirely without micropunctures, micropunctures becoming more distinct on anterior angles. Elytra slightly transverse, suture distinctly shorter than pronotum at middle.

Abdomen with disc of tergites III-VI distinctly impunctate medially, VI slightly more narrowly than others.

Median lobe in lateral view projected ventrad, with hooked apex, without basal teeth (Fig. 13J); median lobe in parameral view slender, with very slight expansion at about apical two-thirds, apical portion evenly converging to acute apex (Fig. 13I); paramere about as long as median lobe, slender, moderately expanded in apical two-thirds, apical portion broad and truncate (Fig. 13H), peg setae arranged in marginal group with some scattered setae mediad (Fig. 13K); male sternite VIII with distinct but shallow emargination and triangular glabrous area medially; male sternite IX moderately expanded at midlength, with distinct emargination.

Female tergite VIII with median emargination broad triangular, moderately deep; female tergite X elongate shield-shaped, with the disc evenly convex and lacking distinct raised areas, apex acuminate with apex projected.

Distribution.

Figure 22A. Bolitogyrus vulneratus is known only from low hills of central and southern Vietnam.

Bionomics.

One specimen was collected in March at 100 m.

Comments.

Bolitogyrus vulneratus has been confused with many small species in previous literature and in collections because, until now, only the female holotype was available. Study of the male genitalia reveals that this species is related to another lowland species, B. flavus , but can be distinguished by the presence of medial and lateral pale areas of the elytra. Bolitogyrus vulneratus is also similar externally to B. hainanensis but can be distinguished based on the simply hooked apex of the median lobe, absence of a clear median group of peg setae and a non-bilobed paramere. Two females (cShu) from southern Vietnam lowlands (60 km NE of Hoa Chi Min city) were studied that may represent an additional, undescribed species close to B. vulneratus . The elytral markings are longer and female tergite X has a distinct, raised area on the disc.