Bolitogyrus elegans (Cameron, 1937)

Brunke, Adam J., 2017, A revision of the Oriental species of Bolitogyrus Chevrolat (Coleoptera, Staphylinidae, Staphylininae), ZooKeys 664, pp. 1-97 : 60-62

Bolitogyrus elegans (Cameron, 1937) Figs 2G, 4D, 4E, 18A-C, 20A (map)

Cyrtothorax elegans Cameron, 1937: 28.

Type locality.

Baturaden ( “Batoerraden”), Mt. Slamet, Central Java.

Type material.

Cyrtothorax elegans Cameron, 1937.

Syntypes (2♂, 4♀, BMNH, FMNH): Batoerraden [=Baturaden], G. Slamat [=Slamet], Java, F.C. Drescher, VII.1928 [printed] / M. Cameron., Bequest., B.M. 1955-147 [printed] / SYNTYPE Cyrtothorax elegans Cameron, 1937 det. A. Brunke 2017 [red label] / AJB0000407 [identifier label].; same except: AJB0000509; same except Chicago Nat. Hist. Mus. (ex. M. Cameron Colln. by exchange with Brit. Mus. Nat. Hist.) [printed] / AJB0000508; same except, IX-1932, AJB0000510, AJB0000511; same except, 22-III-1930, AJB0000512.

Diagnosis.

This species can be recognized by the following combination of characters: orange frons contrasting with dark head (Fig. 2G); pronotal margin only weakly expanded, no more than three lateral puncture widths wide (Fig. 4D); apical antennomere distinctly paler than previous segments (Fig. 2G).

Redescription.

Measurements ♂ (n = 2): HW/HL 1.38-1.40; PW/PL 1.10-1.13; EW/ EL 1.16-1.21; ESut/PL 0.74-0.76; PW/HW 0.97-1.01; forebody length 4.1-4.4 mm.

Measurements ♀ (n = 4): HW/HL 1.35-1.38; PW/PL 0.99-1.03; EW/ EL 1.22-1.23; ESut/PL 0.75-0.79; PW/HW 0.99-1.03; forebody length 4.2-4.7 mm.

Coloration: head dark with orange frons; pronotum varying from entirely reddish-orange, to with median and pair of darkened areas; elytra dark with humeri, apical angles and v-shaped, raised discal marking light yellow, base and area along suture orange, these pale areas often connecting to leave only outer apical areas dark; scutellum dark to reddish with dark border; antennomere 1 yellow with darkened apex, 2-5 light brownish-red, 6-10 dark brown, apical segment distinctly paler, light brown to yellow; palpi yellow-brown; legs yellow, on ventral face, very apex of femur darkened.

Head distinctly transverse, dorsal surface with moderately dense, clearly separated asetose punctures, frons with very few scattered punctures and shallow Y-shaped impression. Antennomeres 6 slightly, 7-10 distinctly transverse, 10 more elongate than 9, 7-10 slightly asymmetrical.

Pronotum slightly transverse to quadrate, about as wide as head, with scattered shallow micropunctures on disc, becoming more distinct on anterior angles. Elytra slightly transverse, suture distinctly shorter than pronotum at middle, punctation relatively sparse, with most punctures separated by a distance not less than their diameter.

Abdomen with disc of tergites III-VI distinctly impunctate medially, basal impressions with elongate punctures; sternites III-IV with basal line distinctly projected posteriad at middle.

Median lobe in lateral view with apical fourth more strongly narrowed to apex, which is deflexed ventrad (Fig. 18B); median lobe in parameral view with basal teeth appearing medially, apical portion elongate triangular and slightly to strongly acuminate (Fig. 18A); paramere distinctly longer than median lobe, widest at about midlength, with long apical portion distinctly curved dorsad over apex of median lobe in lateral view (Fig. 18B-C); peg setae arranged in single row of variable density, basal-most setae larger and sometimes duplicated, rows removed from margin and at most only weakly converging (Fig. 18C); male sternite VIII with shallow emargination and triangular glabrous area medially; male sternite IX moderately expanded at midlength, with distinct, deep emargination.

Female tergite VIII with median emargination varying from small and triangular to moderately deep and elongate triangular; female tergite X elongate, with acute, acuminate apex; disc only weakly raised in apical half, not separated by ridges.

Distribution.

Figure 20A. Known only from the type locality on Mt. Slamet, Java.

Bionomics.

Specimens were collected in March and July.

Comments.

Bolitogyrus elegans is externally most similar to allopatric B. smetanai (Thailand, Myanmar) but is easily distinguished by the pale apical antennomere and the more sparsely punctate elytra.