Pseudobironium incisum, 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 : 703-704

Pseudobironium incisum sp. nov. Figs 55-57

HOLOTYPE: Ƌ, VIETNAM Tuyen Quang Prov., 360m Na Hang Reserve 20-24.V.97 rainfor. FIT leg. S. Peck #97-13 ( MHNG).

PARATYPES: VIETNAM, with the same data as the holotype, 1 ♀; with the same data but 16-20.V. and #97-10, 1 ♀. – With the same data as holotype but 300m, #7-12, 1 Ƌ, 1 ♀. – Cao Bang Prov., Ba Be Nat. Park 7-11.V. 97, 180m for. FIT, 1 Ƌ leg. S. Peck, #97-2 (all MHNG) .

DESCRIPTION: Length 2.60-2.75 mm, width 1.75-1.90 mm. Head and body reddish-brown, pronotum sometime becoming lighter laterally, mesoventrite and metaventrite slightly darkened. Prohypomera and most of abdomen about as, or lighter than metaventrite, apical abdominal segment light reddish-brown to yellowish. Femora and tibiae as metaventrite, tarsi lighter than tibiae, antennomeres I to VI light reddishbrown, following infuscate. Maxillary palpi with palpomere IV, about 3 times as long as wide. Length ratio of antennomeres as II 12: III 9: IV 17: V 19: VI 15: VII 17: VIII 15: IX 15: X 16: XI 21; antennomere XI about three times as long as wide. Pronotal punctation fine and dense, punctures not clearly delimited, puncture intervals mostly about twice to three times as large as puncture diameters. Elytra lacking impression and hump. Elytral punctation dense, clearly less fine than pronotal, with punctures fairly will delimited, puncture intervals mostly twice to three times as large as puncture diameters. Prohypomera impunctate. Mesoventrite punctate near margin, lacking median ridge. Metaventrite not microsculptured, in median third slightly convex, with coarse punctation covering almost entire surface, impunctate only on narrow mesal area between mesocoxae; punctures coarse, well delimited, becoming very dense and smaller posteriad, puncture intervals mostly about as large as or smaller than puncture diameters. Lateral parts of metavenrite very finely punctate. Submesocoxal area somewhat longer than third of interval to metacoxa. Metacoxal process impunctate, microsculptured, lacking median stria or tubercle, with slightly concave margin. Mesotibiae and metatibiae distinctly curved, mesotibial ventral spur straight. Abdomen with punctulate microsculpture covering almost entire 1. sternite, latter very finely punctate, with very shallow, poorly delimited lateral impression.

Male: Protarsus shorter than protibia, with tarsomeres 1 to 3 about even in length, distinctly widened, narrower than apex of protibia, bearing tenent setae about as long as respective tarsomere. Aedeagus (Figs 55-57) 0.99-1.12 m long. Median lobe narrow, with basal bulb about as long as apical process, latter strongly inflexed, bent near tip and evenly narrow in lateral view. Parameres almost straight, notched at level of apex of median lobe, slightly narrower posterior than anterior notch. Internal sac with mesal guide-sclerites, pair of flat lateral sclerites posterior latter and joined proximally to weekly sclerotized plates, membranes with dense strigulate structures and in apical part with long spine-like structures.

FIGS 53-57

(53, 54) Pseudobironium horaki sp. nov., aedeagus (53) and internal sac (54) in dorsal view. (55-57) Pseudobironium incisum sp. nov., aedeagus in dorsal (55) and lateral (56) views, internal sac (57) in dorsal view; scale bars for aedeagus = 0.2 mm, for internal sac = 0.1 mm.

DISTRIBUTION: Vietnam.

ETYMOLOGY: The species epithet is a Latin adjective, referring to the notched parameres.

COMMENTS: This species is unique within the genus in having notched parameres.