Pseudobironium parabicolor, 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 : 708-709

Pseudobironium parabicolor sp. nov. Figs 63-65

HOLOTYPE: Ƌ, CHINA: S. Yunnan, Mengyang Nat. Res., ca 500m, 12.XI.1994, rotten wood, leg. S. Kurbatov ( MHNG).

DESCRIPTION: Length 2.40 mm, width 1.80 mm. Body reddish-brown. Head with vertex darker than frons. Pronotum with dark brown to almost blackish, well delimited, subtriangular spot covering most of its centre. Elytra each with dark basal band extending from lateral margin almost to inner third of basal width, dark transverse central band extended from lateral margin about to inner fourth of disc, and distinctly darkened along entire apical and lateral margins. Mesoventrite, mesepisterna and abdominal sternite 1 hardly darker than prohypomera, metaventrite and abdominal sternites 2 to 5 distinctly darker than prohypomera, apical abdominal segments lighter, almost yellowish. Antennomeres I to VI and maxillary palpi yellowish, antennomeres VII-XI darkened. Femora and tibiae about as light as first abdominal sternite, tarsi slightly lighter. Maxillary palpi with palpomere IV tapering, almost 3 times as long as wide. Length ratio of antennomeres as II 9: III 5: IV 9: V 10: VI 10: VII 14: VIII 13: IX 16: X 14: XI 22; antennomere XI 4 times as long as wide. Frons and vertex very finely punctate. Pronotal and elytral punctation similar, fine, fairly sparse and irregular, punctures shallow and not well delimited, puncture intervals usually twice to four times as large as puncture diameters. Prohypomeral punctation indistinct, much finer than that on pronotum. Posterior and mesal parts of mesoventrite punctate. Median part of metaventrite distinctly convex, with longitudinally strigulate microsculpture, distinct punctation limited onto areas laterad smooth, narrow mesal area. Lateral parts of metaventrite appearing impunctate, with strigulate microsculpture on posterior surface. Submesocoxal area about as long as third of shortest interval to metacoxae. Metacoxal process truncate, impunctate, lacking stria or tubercle, weakly swollen transversally. Mesotibiae and metatibiae weakly curved, mesotibial ventral spur straight. Abdominal sternite 1 with strigulate microsculpture, very finely punctuate. Following sternites with basal wrinkles or coarse basal punctures.

Male: Protarsus shorter than protibia, protarsomeres 1 to 3 weakly widened, much narrower than apex of protibia, bearing short ventral setae. Aedeagus (Figs 63-65) 0.88 mm long, moderately sclerotized. Basal bulb small. Apical process about 1.6 times as long as basal bulb, not inflexed, with ventral side sinuate, tip obliquely truncate in lateral view, parameres wide, almost straight, widened apically, subtriangular apically in dorsal view, forming large, folded lobe in lateral view. Membranous parts of internal sac with long spicules-like structures posterior complex of sclerotized pieces.

DISTRIBUTION: China: Yunnan.

ETYMOLOGY: The species epithet refers to similarity with P. bicolor .

COMMENTS: This species resembles P. bicolor , in particular by the colour pattern. However, its elytra are not darkened along suture. Both species differ distinctly

FIGS 63-66

(63-65) Pseudobironium parabicolor sp. nov., aedeagus in lateral (63) and dorsal (64) views, internal sac (65) in dorsal view. (66) Pseudobironium pseudobicolor sp. nov., aedeagus in lateral view; scale bars for aedeagus = 0.2 mm, for internal sac = 0.1 mm.

by their aedeagi. The parameres are in P. parabicolor conspicuously widened and subtriangular at apices, while they are only slightly widened and distinctly rounded in P. bicolor .