Lithocharis parvincisa, Assing, 2015

Assing, Volker, 2015, A revison of the Lithocharis species of the Palaearctic, Oriental and Australian regions (Coleoptera: Staphylinidae: Paederinae: Medonina), Linzer biologische Beiträge 47 (2), pp. 1133-1178 : 1161-1163

Lithocharis parvincisa nov.sp. ( Figs 77-84 )

Type material: Holotype ♂: " INDONESIA: SULAWESI UTARA, Dumoga-Bone N.P. , February 1985 / human dung baited trap, I. Hanski 920 m / 26.29 / R.Ent.Soc.Lond., Project Wallace, B.M. 1985-10 / Holotypus ♂ Lithocharis parvincisa sp. n. det. V. Assing 2015" ( BMNH) . Paratypes: 1♀: same data as holotype ( BMNH) ; 2♂♂, 1♀: " INDONESIA: SULAWESI UTARA, Dumoga-Bone N.P., April 1985 / Rothamsted light trap, site 1, 200 m. H. Barlow / R.Ent.Soc.Lond., Project Wallace, B.M. 1985-10" ( BMNH, cAss) ; 1♀: " INDONESIA: SULAWESI UTARA, Dumoga-Bone N.P., April 1985 / Pit fall trap / Plot C, ca 400 m, Lowland forest / R.Ent.Soc.Lond., Project Wallace, B.M. 1985-10" ( BMNH) ; 3♀♀: " INDONESIA: SULAWESI UTARA, Dumoga-Bone N.P., 1985. / ' Edwards' Camp, Lowland forest , 664 m, 26.iv.-4.vi. / Malaise trap / R.Ent.Soc.Lond., Project Wallace, B.M. 1985-10" ( BMNH) ; 1♂: " INDONESIA: SULAWESE UTARA, Dumoga-Bone N.P., May 1985. / 'Clarke' Camp, Lower montane forest, 1140 m / At light / R.Ent.Soc.Lond., Project Wallace, B.M. 1985-10" (cAss) .

Etymology: The specific epithet (adjective) is composed of the adjectives parvus (small) and incisus (incised). It alludes to the relatively small posterior incision of the male sternite VIII.

Description: Body length 4.0- 4.7 mm; length of forebody 2.3-2.5 mm. Coloration: head dark-brown to black; pronotum brown to dark-brown; elytra brown; abdomen brown to dark-brown, with the posterior margins of the segments yellowish to yellowishbrown; legs yellowish; antennae reddish.

Head ( Fig. 77 ) weakly transverse, 1.06-1.09 times as broad as long, lateral margins behind eyes subparallel in dorsal view; punctation dense and fine; interstices with shallow microreticulation, glossy ( Fig. 78 ). Eyes large, noticeably longer than postocular region in dorsal view. Antennae approximately 1.7 mm long; preapical antennomeres distinctly oblong.

Pronotum ( Fig. 77 ) approximately as long as broad and as broad as head; anterior angles sharply, posterior angles weakly marked; lateral margins weakly converging posteriad in dorsal view; midline with pronounced impunctate band; punctation dense and fine, slightly more distinct than that of head; interstices without microsculpture ( Fig. 79 ). Elytra ( Fig. 77 ) approximately 1.1 times as long as pronotum; punctation very dense and fine; interstices without microsculpture. Hind wings present. Protarsomeres I-IV weakly dilated. Metatarsomere I approximately as long as the combined length of II and III.

Abdomen narrower than elytra; punctation fine and very dense; interstices with shallow microreticulation; posterior margin of tergite VII with palisade fringe.

♂: sternite VII ( Fig. 80 ) moderately transverse, posterior margin with shallow median excision, this excision with a comb of 20-25 moderately long palisade setae; sternite VIII ( Fig. 81 ) weakly transverse and with unmodified pubescence, posterior incision small and broadly V-shaped; aedeagus ( Figs 82-84 ) approximately 0.8 mm long, without dorso-lateral apophyses; ventral process apically deeply bifid; internal structures of distinctive shapes.

Comparative notes: Regarding its external and male sexual characters, L. parvincisa is similar to the sympatric L. vilis , from which it is distinguished by the shape of the pronotum, the more slender antennae, the less distinctly dilated protarsomeres I-IV, the shorter comb of palisade setae at the posterior margin of the male sternite VII, the less transverse male sternite VIII with a much smaller posterior excision and with unmodified pubescence, and by the smaller aedeagus without dorso-lateral apophyses and with smaller sclerotized internal structures of different shapes.

Distribution and natural history: The type specimens were collected in Dumoga-Bone National Park in Sulawesi Utara ( Indonesia: northern Sulawesi) with traps baited with human faeces, with light traps, Malaise traps, and pitfall traps at altitudes of 200-1140 m.

Figures

Figs 76-84: Lithocharis preangerana CAMERON, holotype (76), and L. parvincisa nov.sp. (77-84): (76-77) forebody; (78) median dorsal portion of head; (79) median portion of pronotum; (80) male sternite VII; (81) male sternite VIII; (82-83) aedeagus in lateral and in ventral view; (84) apical portion of aedeagus in ventral view. Scale bars: 76-77: 1.0 mm; 78-84: 0.2 mm.