Bolitogyrus tumidus Brunke

Brunke, Adam J., 2017, A revision of the Oriental species of Bolitogyrus Chevrolat (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 664, pp. 1-97 : 48

Bolitogyrus tumidus Brunke sp. n. Figs 15 J–L, 21D (map)

Type locality.

Mt. Phu Phan, Hua Phan, Laos.

Type material.

Holotype (♂, NMW): NE-LAOS, prov. Hua Phan, Ban Saluei, Phou Pan, 1. -31.5.2011, 20°12'N 104°01E, 1500-1900 m, leg. Holzschuh [printed] / HOLOTYPE Bolitogyrus tumidus Brunke, des. A. Brunke 2017 [red label] / AJB0000423 [identifier label].

Paratypes (2 ♂, NHMB): Laos: Hua Phan: Mt. Phu Phan, ca. 1750 m, 20.205 104.010, 17.V.-3.VI.2007, Vit. Kuban, AJB0000672, AJB0000673.

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); median lobe in lateral view projected ventrad, with hooked apex, basal teeth appearing distant from strongly expanded ventral face (Fig. 15K); median lobe in parameral view with apex acuminate (Fig. 15J).

Description.

Measurements ♂ (n = 3): HW/HL 1.34-1.39; PW/PL 1.21-1.27; EW/ EL 1.20-1.25; ESut/PL 0.73-0.79; PW/HW 1.08-1.08; forebody length 4.8-5.1 mm.

Similar to B. vulneratus and differing only in the following: elytral markings only weakly connected or separate in specimens available; head less transverse; antennomeres overall less transverse, antennomere 6 slightly, 7-10 distinctly transverse, 8-10 asymmetrical; forebody slightly longer; median lobe in lateral view with ventral face expanded subapically, apical portion projected ventrad, strongly constricted and hooked apically, basal teeth appearing distant from ventral face (Fig. 15K); median lobe in parameral view with apical portion expanded and subparallel, constricted to short, acuminate and narrow apex, basal teeth appearing mediad of lateral margins (Fig. 15J); paramere about as long as median lobe, narrower with longer apical portion (Fig. 15J); peg setae more numerous and densely arranged into discernable marginal and medial groups, marginal group broader (Fig. 15L); male sternite VIII emargination very slight. Female unknown.

Distribution.

Figure 21D. Known only from the type locality on Mt. Phu Pan in northern Laos.

Bionomics.

Specimens were collected at an elevational range of 1500-1900 m in May and June.

Etymology.

The specific epithet refers to the swollen, preapical portion of the median lobe.

Comments.

This species is most similar to B. rufomaculatus and B. depressus but can easily be distinguished by the distinctively expanded median lobe and its distribution in Laos.