Bolitogyrus rougemonti Brunke

Brunke, Adam J., 2017, A revision of the Oriental species of Bolitogyrus Chevrolat (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 664, pp. 1-97 : 40

Bolitogyrus rougemonti Brunke sp. n. Figs 6D, 14 G–I, 21B (map)

Type locality.

Banks of Khwae Noi River, near Sai Yok, Kanchanaburi, Thailand.

Type material.

Holotype (♂, cRou): THAILAND r. Kwae Noi, Ban Sai Yok, III.1987, G. de Rougemont [printed] / HOLOTYPE Bolitogyrus rougemonti Brunke, des. A. Brunke 2017 [red label] / AJB0000414 [identifier label].

Paratype (♂, cRou): same data as holotype except: AJB0000415.

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. 6C); apex of median lobe flattened in lateral view (Fig. 14H), broad and short in parameral view (Fig. 14G).

Description.

Measurements ♂ (n = 2): HW/HL 1.40-1.41; PW/PL 1.28-1.31; EW/ EL 1.23-1.29; ESut/PL 0.77-0.80; PW/HW 1.02-1.04; forebody length 4.3-4.5 mm.

Extremely similar to B. pictus and differing only in the following: only dark specimens known; head, pronotum and abdomen entirely dark; antennomere dark brown; median lobe in lateral view strongly flattened in apical portion, dilated subapically, basal teeth appearing removed from lateral margin (Fig. 14H); median lobe in parameral view with apical portion slightly narrower (Fig. 14G); paramere with shorter and distinctly acuminate apical portion (Fig. 14I), in lateral view strongly deflexed dorsad over apex of median lobe; female unknown.

Distribution.

Figure 21B. Known only from the type locality in western Thailand.

Bionomics.

The type series was collected in March along the banks of a large river, with many other beetles including Bolitogyrus (G. Rougemont, pers. comm.) that may have washed out from preferred deadwood microhabitats.

Etymology.

This species is named in honor of Mr. Guillaume de Rougemont (United Kingdom), the sole collector of this and many other Oriental Bolitogyrus species. Material from his personal collection has greatly increased the comprehensiveness of this monograph.

Comments.

At present, B. rougemonti is the only lowland member of the Pictus Group. This species is distinctive for its expansion of the median lobe in lateral view and shortened apex of the paramere.