Pseudobironium flagellatum, 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 : 692-693

Pseudobironium flagellatum sp. nov. Figs 37, 38

HOLOTYPE: Ƌ, LAOS, Kham Mouan Prov. , Ban Khoun Ngeum, env. 200m, 18°07'N

104°29'E, 19.-31.V.2001, leg. P. Pacholátko ( NHMB) .

DESCRIPTION: Length 2.70 mm, width 1.95 mm. Head, most of body, femora and tibiae uniformly, fairly light, reddish-brown. Prohypomera, apical abdominal segments, tarsi and antennae slightly lighter. Maxillary palpi with palpomere IV slightly more than twice as long as wide, tapering. Length ratio of antennomeres as II 10: III 10: IV 18: V 17: VI 14: VII 15: VIII 15: IX 15: X 14: XI 17; antennomere XI about 3.5 times as long as wide. Head and pronotum with dense punctation, that on pronotum coarser. Punctures not well delimited, shallow, puncture intervals on pronotum mostly about as large as to three times as large as puncture diameters. Elytra each with very low subapical hump, lateral impression absent. Elytral punctation distinctly coarser that pronotal punctation, punctures mostly well delimited, puncture intervals mostly slightly larger to three times as large as puncture diameters, near apices denser than on remaining surface. Prohypomera impunctate. Mesoventrite impunctate, lacking median ridge or line. Metaventrite not microsculptured. Median part of metaventrite weakly convex, coarsely and densely punctate except on mesal area, coarse punctures sharply delimited, with diameters to part larger than puncture intervals. Lateral parts of metaventrite very finely punctate, appearing impunctate. Submesocoxal area slightly shorter than half of interval to metacoxa. Metacoxal process smooth, not punctured and without microsculpture, with weakly concave margin, lacking median ridge or tubercle. Mesotibiae and metatibiae weakly curved, mesotibial ventral spur straight. Abdominal sternite 1 very finely, sparsely punctate, with punctulate microsculpture covering middle third of sternite, becoming almost obsolete apically. Lateral parts of sternite 1 lacking microsculpture, with shallow transverse stria followed by very shallow, inconspicuous impression. Following sternites lacking wrinkles, with hardly visible microsculpture.

Male: Protarsus shorter than protibia, protarsomeres 1 to 3 distinctly widened, narrower than apex of protibia, bearing short tenent setae. Aedeagus (Figs 37, 38) 1.06 mm long. Median lobe with basal bulb elongate, about as long as apical process. Apical process strongly inflexed, with ventral side sinuate, tip abruptly bent and acute. Parameres moderately curved in dorsal and lateral views, almost evenly wide from bases to apices, in lateral view wider than in dorsal view. Internal sac with very long flagellum curved proximally and extruded apically, pair of mesal, conical sclerites not well delimited and surrounded by weakly sclerotized structures; membranes denticulate apically.

DISTRIBUTION: Laos.

ETYMOLOGY: The species epithet refers to the presence of a aedeagal flagellum.

COMMENTS: The species is similar to the Nepalese P. ineptum . It may be distinguished by the shape of the parameres that are curved, the more elongate basal bulb of the aedeagus, and the internal sac lacking strigulate structures.