Bolitogyrus vietnamensis (Scheerpeltz, 1974)

Brunke, Adam J., 2017, A revision of the Oriental species of Bolitogyrus Chevrolat (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 664, pp. 1-97 : 27-29

Bolitogyrus vietnamensis (Scheerpeltz, 1974) Figs 11 G–I, 20B (map)

Cyrtothorax vietnamensis Scheerpeltz, 1974: 185

Type locality.

Bao Lac (town, likely in vicinity of), Cao Bang, Vietnam..

Type material.

Cyrtothorax vietnamensis Scheerpeltz, 1974.

Holotype (♀, NMW): ♀ [printed] / TONKIN, Bao Lac [printed] / Le Moult vend via Reinbak [printed] / Cyrtothorax vietnamensis n. spec. [handwritten] / ex. coll. Scheerpeltz [blue printed label] / ALLOTYPUS [red handwritten label] / TYPUS Cyrtothorax vietnamensis O. Scheerpeltz [red label] / vietnamensis Scheerp. [handwritten] / AJB0000404 [identifier label].

Other material.

VIETNAM: Tuyen Quang: NaHang Reserve, rainforest, FIT, 16-20.V.1997, S. Peck, 1 ♂, CNC655573 (CNC).

Diagnosis.

Within the Carnifex Group: elytral disc entirely reddish (Fig. 1F); abdominal tergites III-V with relatively wide dark markings at middle, more than 1/3 of tergal width (Fig. 5C); median lobe with basal teeth placed laterally in parameral view (Fig. 11G); paramere with slender apical portion and rows of peg setae (Fig. 11I).

Redescription.

Measurements ♂ (n = 1): HW/HL 1.50; PW/PL 1.37; EW/ EL 1.22; ESut/PL 0.80; PW/HW 1.12; forebody length 7.1 mm

Measurements ♀ (n = 1): HW/HL 1.48; PW/PL 1.36; EW/ EL 1.22; ESut/PL 0.79; PW/HW 1.11; forebody length 6.9 mm.

Extremely similar to B. carnifex and differing only in the following: head slightly more transverse; pronotum slightly wider relative to head; lateral face of midfemur with distinct dark band on holotype female (as in Fig. 5D) and only vague darkening on non-type male (as in Fig. 5E); median lobe in parameral view with narrower apical portion (Fig. 11G), in lateral view with subapical teeth on carina connected to apex, apex more angulate, less expanded near level of basal teeth (Fig. 11H); paramere much more slender apically, with peg setae arranged into rows (Fig. 11I).

Distribution.

Figure 20B. Currently known from two localities in northern Vietnam.

Bionomics.

One specimen was collected in an FIT in a rainforest during May, at a relatively low (but unspecified elevation).

Comments.

Scheerpeltz (1974) stated that the type of B. vietnamensis was completely dark on the pronotum and abdomen, while the specimen is actually bicolored on both. The reddish areas of the specimen have become darkened, likely by a killing agent. Bolitogyrus vietnamensis is most similar to allopatric B. pederseni from southern Laos and northern Cambodia but can be distinguished by the differently shaped apex of the median lobe and narrower paramere.