Bolitogyrus concavus Brunke

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

Bolitogyrus concavus Brunke sp. n. Fig. 15 A–C, 21C (map)

Type locality.

Nokrek National Park, West Garo Hills, Meghalaya, India.

Type material.

Holotype (♂, NMW): NE-INDIA, Meghalaya, W. Garo Hills, Nokrek NP., ca 1100 m [printed] / 25°29.6'N, 90° 19.5E, 9.-17.5.1996, leg. Jendek & Sausa [printed] / Bolitogyrus vulneratus Fv., Det. A. Smetana, 2000 [written] / HOLOTYPE Bolitogyrus concavus Brunke, des. A. Brunke 2017 [red label] / AJB0000430 [identifier label].

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 of different sizes and never entirely fused (Fig. 5G); apical portion of median lobe in lateral view flattened and concave ventrad (Fig. 15B), in parameral view narrow and acuminate (Fig. 15A).

Description.

Measurements ♂ (n = 1): HW/HL 1.34; PW/PL 1.29; EW/ EL 1.20; ESut/PL 0.75; PW/HW 1.05; forebody length 4.4 mm.

Extremely similar to B. pictus and differing only in the following: only dark specimen known; median lobe in lateral view with apical portion thin, and concave ventrad, apex deflexed dorsad, basal teeth extremely weakly formed (Fig. 15B); median lobe in parameral view with apical portion distinctly longer and acuminate (Fig. 15A); paramere only slightly expanded about midway (Fig. 15A); peg setae arranged in marginal group and as several scattered setae medially (Fig. 15C). Female unknown.

Distribution.

Figure 21C. Known only from the type locality in the Garo Hills, Meghalaya, India.

Bionomics.

The holotype was collected at approximately 1100 m in May.

Etymology.

The species epithet refers to the apex of the median lobe, which is uniquely thin and concave in lateral view.

Comments.

Bolitogyrus concavus is most similar to allopatric B. profundus (China, Laos, Thailand) but is easily distinguished by the shape of the median lobe and the peg setae of the paramere, which are arranged mostly along the margin.