Pseudobironium javanum, Lobl & Liang Tang, 2013

Löbl, Ivan & Tang, Liang, 2013, A review of the genus Pseudobironium Pic (Coleoptera: Staphylinidae: Scaphidiinae), Revue suisse de Zoologie 120 (4), pp. 665-734 : 679-680

Pseudobironium javanum sp. nov. Figs 13, 14

HOLOTYPE Ƌ: INDONESIA, labelled: Coll. F. C. Drescher Java, Preanger. N. O. I. [printed] Tapos - 700m Mt. Ojedo 22.IX.1905 [handwritten] ( ZMBC).

DESCRIPTION: Length 2.45 mm, width 1.75 mm. Head, body, femora and tibiae reddish-brown, antennae and tarsi lighter, almost yellowish. Very narrow basal strip of pronotum, prohypomera and elytra along suture darkened, mesoventrite, metaventrite and abdominal sternite 1 somewhat darker than most of pronotum and elytra. Maxillary palpi with palpomere IV tapering, about 3 times as long as wide. Length ratio of antennomeres as II 9: III 6: IV 12: V 17: VI 13: VII 17: VIII 17: IX 18: X 15: XI 19; antennomere XI about 3 times as long as wide. Punctation on pronotum coarser than that on frons, with puncture intervals mostly about as large as to 3 times as large as puncture diameters. Elytra lacking lateral impressions, without humps, in apical part not impressed, with punctation distinctly coarser than that on pronotum, punctures shallow, not well delimited, puncture intervals mostly about twice to three times as large as puncture diameters. Prohypomera finely punctate. Mesoventrite without mesal ridge. Mesal and apical parts of mesoventrite distinctly, densely punctate, with short pubescence. Metaventrite not microsculptured, flattened in middle, with foveiform impression in centre; entire median part very densely and fairly coarsely punctate, distinctly pubescent, puncture diameters to part larger than puncture intervals. Lateral parts of metaventrite sparsely and very finely punctate. Submesocoxal area about as long as half of shortest interval to metacoxa. Metacoxal process distinctly punctate and pubescent, punctures smaller and less dense than those on median part of metaventrite, mesal stria or tubercle absent, margin truncate. Mesotibiae and metatibiae distinctly curved, mesotibial ventral spur straight. Abdominal sternites with strigulate microsculpture, sternite 1 very finely and sparsely punctate, with lateral transverse impression, following sternites lacking basal wrinkles.

Male: Protarsus somewhat shorter than protibia, with tarsomeres 1 to 3 moderately widened, narrower than apex of protibia, bearing fairly short tenent setae. Aedeagus (Figs 13, 14) 0.81 mm long. Median lobe with basal bulb about as long as apical process, latter hardly inflexed, convex ventrally, with short, bent tip. Parameres almost evenly wide and hardly sinuate between bases and apices in dorsal view, arcuate and narrowed in middle in lateral view. Internal sac without flagellum and lacking admesal complex of sclerites, with short, straight mesal guide-sclerites, membranes with striate structures visible in lateral view.

DISTRIBUTION: Indonesia: Java.

ETYMOLOGY: The species epithet refers to Java.

COMMENTS: This species may be distinguished from most of its congeners by the middle of the metaventrite densely punctate, lacking smooth mesal area, with distinct pubescence and foveiform impression in middle. It is also well characterized by the shape of the aedeagus and the internal sac lacking complex of sclerites and flagellum. Pseudobironium plagiferum , that shares a simple internal sac without a complex of sclerotized structures, differs drastically by the colour pattern of body, longer antennae with the antennomere IV about as long as two thirds of III, and by the shape of the parameres.

Pseudobironium plagiferum Löbl, 1980 Pseudobironium plagifer Löbl, 1980 a: 92 . Type material. Holotype Ƌ: MHNG. Type locality:

Taiwan. Distribution: Taiwan.

COMMENTS: The description of this species was based on a single specimen from “ Taiwan ”, lacking detailed locality data. Additional records from Taiwan are in Löbl, 2011b. This species may be easily distinguished from its congeners by the conspicuous colour pattern of the elytra, each having a large, well delimited black spot separated from elytral margins and sutural stria by bright reddish areas.