Pseudobironium bilobum, 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 : 696-697

Pseudobironium bilobum sp. nov. Figs 41-44

HOLOTYPE: Ƌ, MALAYSIA, West Malaysia Pahang C. Highlands Tanah Rata, 20.-25.I. 1995 Gn. Jasar, 14-1500m, leg. S. Bečvář ( NHMW).

PARATYPES: with the same data as the holotype, 15 Ƌ and 7 ♀ ( NHMW, MHNG) . – Pahang Cameron Highlands Tanah Rata 1600m, 11.-27.II.2000, 1 ♀ leg. J. Horák ( MHNG) . – Perak Cameron Highlands Tanah Rata , 13.-16.III.1997, 1 Ƌ, 2 ♀ leg. I. Jeniš ( NHMW, MHNG) .

DESCRIPTION: Length 2.35-2.75 mm, width 1.65-2.10 mm. Most of body very dark, blackish-brown to black. Head, apical abdominal segments, femora and tibiae slightly lighter, dark reddish-brown. Tarsi and antennomeres I to VI light reddishbrown, antennomeres VII to XI infuscate. Maxillary palpi with palpomere IV about 3 times as long as wide, tapering. Length ratio of antennomeres as II 11: III 9: IV 15: V 15: VI 13: VII 15: VIII 15: IX 16: X 16: XI 18; antennomere XI about three times as long as wide. Head and pronotum with dense and fine punctation; punctures not well delimited, shallow, puncture intervals on pronotum mostly about twice to three times as large as puncture diameters. Elytra lacking subapical humps and lateral impressions, each with very shallow, small subapical impression. Elytral punctation distinctly coarser that pronotal punctation, excepted near basal margin, punctures mostly well delimited, puncture intervals mostly twice to three times as large as puncture diameters, few larger punctures in subapical impressions. Prohypomera impunctate. Mesoventrite punctate, lacking median ridge or line. Metaventrite not microsculptured. Median part of metaventrite weakly convex, finely and densely punctate except on smooth mesal area, punctures sharply delimited, with diameters to part about as large as puncture intervals. Lateral parts of metaventrite very finely punctate, appearing impunctate. Submesocoxal area slightly shorter than half of interval to metacoxa. Metacoxal process with weakly concave margin, impunctate, lacking microsculpture, without mesal ridge, stria or tubercle. Mesotibiae and metatibiae weakly curved, mesotibial ventral spur straight. Abdominal sternite 1 very finely and sparsely punctate, with punctulate microsculpture covering entire surface, and with shallow transverse impression situated posterior mid-length. Following sternites lacking wrinkles, with distinct microsculpture.

Male. Protarsus shorter than protibia, with tarsomeres 1 to 3 moderately widened, narrower than apex of protibia, bearing short tenent setae. Aedeagus (Figs 41-44) 0.87-0.92 mm long. Basal bulb shorter than apical process of median lobe, with dorsal margins expanded apically to form lateral lobes. Apical process weakly inflexed, with apex narrow and rounded in lateral view. Parameres weakly arcuate in dorsal and lateral views, and weakly narrowed in middle part. Internal sac with mesal guide-sclerites, pair of conical sclerites containing each single, narrow invaginated rod, and two additional, flat sclerites. Membranes of internal sac scale-like basally, spinous apically, and with strigulate structures in middle part.

DISTRIBUTION: India: Meghalaya; West Malaysia.

ETYMOLOGY: The species epithet refers to the presence of lobes on the dorsal side of the aedeagal basal bulb.

COMMENTS: A unique feature of this species is the presence of lateral lobe of the median lobe. It resembles in external characters P. sinicum from which it may be distinguished by the comparatively shorter submesocoxal areas and the slightly impressed elytral apices. It is also similar to P. merkli and P. montanum in general appearence. See comments under these species.