Bironium ornatum, Löbl, 2021

Löbl, Ivan, 2021, A review of the Bironium Csiki, 1909 (Coleoptera: Staphylinidae: Scaphidiinae) of New Guinea and the Moluccas, Acta Musei Moraviae 106 (2), pp. 227-248 : 238-239

Bironium ornatum sp. nov.

( Figs 26 -30)

Type material. Holotype ♂, INDO: Irian Jaya, Monokwari Distr. Maibri vill. Arfak Mts. , 1570m 6- 19.xii. J. HorAEk leg. ( MHNG) . Paratype ♀, with the same data as the holotype ( MHNG).

Description. Length 2.50- 2.56 mm, width 1.40- 1.50 mm. Head and thorax black. Elytra black, each with two ochraceous spots. Anterior spot transverse, expanded near sutural stria; interval between anterior spot and sutural stria somewhat shorter than interval to anterior elytral margin and about as large as interval to lateral stria. Abdomen blackish with dark brown apical segments. Antennae brown, legs blackish­brown, darker than antennae. Pronotum very finely punctate. Scutellum triangulate. Elytra lacking humeral humps; adsutural areas raised; sutural striae impunctate, lateral striae with few punctures; basal striae entire, very shallow and hardly visible in level of humeral areas, discal punctation about as fine as pronotal punctation on prevailing elytral surface, distinctly coarser punctures scattered on middle third of disc. Mesoventrite conspicuously convex, appearing impunctate, with sharply delimited mesal ridge extended from paxillum to apical third of mesal length, lacking striae. Median part of metaventrite flat between mesocoxae, with anterior margin well below margin of mesoventrite, bearing few longitudinal striae, not microsculptured; apical stripe and centre impressed, flattened; metacoxal process horizontal, with bisinuate margin. Lateral parts of metaventrite lacking coarse punctures. Submesocoxal lines punctate. Metanepisterna evenly about 0.08 mm wide. Metanepisternal suture impunctate, slightly sinuate, not curved along metepimeron, nearly reaching margin of metepimeron. Ventrite Iwithout basomedian hump, with strigulate microsculpture, distinctly punctate along basal margin. Following ventrites with punctulate microsculpture. Protarsomeres lacking prominent ventral lobe.

♂: Protarsomeres Ito III distinctly widened, protarsomere Iabout as wide wo thirds of protibial apex, following two tarsomeres narrower, protarsomere Ias long as following two tarsomeres. Apicoventral pair of long setae of protarsomere III not widened apically. Aedeagus as Figs 26 -29, 0.98 mm long.

♀: Gonocoxite as Fig. 30 , without gonostyle.

Distribution. Indonesia: West Papua .

Etymology. The species epithet is a Latin adjective meaning provided and referring to the presence of elytral spots.

Comments. This species may be easily distinguished from the congeners by the elytral spots, in combination with the pattern of elytral punctation. It is also characterized by the mesoventrite strongly convex and lacking striae, and the inner margin of the parameres notched posterior of bases.

Figures

Figs 20-29. 20 – Bironium longipes (Reitter): gonocoxite, scale = 0.1 mm. 21 – Bironium maculatum Löbl: gonocoxite, scale = 0.1 mm. 22–25, Bironium maindai sp. nov.: 22, 23 – Aedeagus in dorsal and lateral views, scale = 0.1 mm; 24 – Paramere in ventral view, scale = 0.1 mm; 25 – Internal sac, scale = 0.1 mm. 26–29, Bironium ornatum sp. nov.: 26, 27 – Aedeagus in dorsal and lateral views, scale 0.2 mm; 28 – Paramere in ventral view, scale = 0.2 mm; 29 – Internal sac, scale = 0.1 mm.

Figs 30-38. 30 – Bironium ornatum sp. nov.: gonocoxite, scale = 0.05 mm. 31–36, Bironium punctatum sp. nov.: 31, 32 – Aedeagus in dorsal and lateral views, scale = 0.2 mm; 33 – Tip of median lobe, scale = 0.05 mm; 34 – Internal sac, scale = 0.05 mm; 35 – Paramere in ventral view, scale = 0.1 mm; 36 – Gonocoxite, scale = 0.05 mm. 37–38, Bironium riedeli sp. nov.: Aedeagus in dorsal and lateral views, scale = 0.1 mm.