Pseudobironium antennatum, 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 : 716-720

Pseudobironium antennatum sp. nov. Figs 78-80

HOLOTYPE: Ƌ, MALAYSIA, West Malaysia , Benom Mts., 15 km E Kampong Dong, 700m, 3°53'N 102°01'E, 1.VI.1998, leg. L. Dembický & P. Pacholátko ( NHMB).

PARATYPES: MALAYSIA, with the same data as the holotype, 3 Ƌ, 1 ♀ ( NHMB, MHNG) . – Perak, CameronHighlands, LataIskandar [waterfall] env., 04°19.5'N 101°19.5'E, 445m, 6.V.2009, 1 Ƌleg. J. Hájek ( NMHC) . – Tioman, 400m, KampongTekek-K. Juara , 9.III.198, 2°48'N 104°11'E, 1 Ƌ, 1 ♀ leg. L. Dembický & P. Pacholátko ( NHMB, MHNG) .

DESCRIPTION: Length 3.30-3.70 mm, width 2.40-2.70 mm. Head and body dark brown to black, venter of body lighter than dorsal side of body, dark brown or dark reddish-brown. Femora and tibiae as ventral side of body, maxillary palpi, antennae and tarsi lighter, reddish-brown to yellowish. Maxillary palpi with palpomere IV tapering posterior mid-length, about 4 times as long as wide. Length ratio of antennomeres as II 15: III 12: IV 23: V 22: VI 19: VII 20: VIII 20: IX 21: X 20: XI 30; antennomere XI about four to five times as long as wide. Head with fine and very dense punctation. Pronotal punctation uneven, most punctures distinctly coarser than on head, dense, not well delimited, puncture intervals usually about as to three times as large as puncture diameters. Elytra lacking subapical humps and lateral impressions, impressed along apices. Elytral punctation distinctly coarser that pronotal punctation, with fairly well delimited puncture and intervals mostly about twice to three times as large as puncture diameters. Prohypomera very finely punctate, appearing smooth. Mesoventrite with median carina, extremely finely punctate near margin, lacking striae. Metaventrite in middle weakly convex, coarsely punctate except on narrow smooth mesal area, without microsculpture. Lateral parts of metaventrite very finely punctate. Submesocoxal area about as long as third of shortest interval to metacoxa. Metacoxal process smooth, not microsculptured, slightly swollen basomedially, margin truncate. Mesotibiae and metatibiae strongly curved, mesotibial ventral spur straight. Abdominal sternite 1 very finely punctate, with large lateral impressions and strigulate microsculpture distinct on entire surface. Following sternites very finely punctate, with strigulate microsculpture, without basal wrinkles.

Male: Protibia longer than protarsus, latter not particularly elongate, with tarsomeres 1 to 3 strongly widened, slightly narrower than apex of protibia, bearing long tenent setae. Aedeagus (Figs 78-80) 1.47-1.50 mm long. Median lobe with basal bulb large, longer than apical process, latter inflexed with sinuate ventral side, tip in lateral view narrow, slightly bent, rounded. Apical process with ventral tubercles. Parameres in dorsal view wide, curved, strongly narrowed toward mid-length, with large mesal lobe, somewhat widened and bent in apical fifth. Parameres in lateral view wide, in middle about as wide as middle of apical process, with ventral margin sinuate, distinctly concave in apical half, dorsal margin weakly concave between base and midlength, expanded between mid-length and apical fifth, dorsal and ventral margins parallel-sided near tip. Internal sac with long mesal guide-sclerites, conical sclerites each bearing invaginated subtriangular sclerite followed by not clearly defined subtriangular structure. Membranes of internal sac lacking scale-like structures and vesicles, striate posteriad sclerites.

DISTRIBUTION: West Malaysia.

ETYMOLOGY: The species epithet is a Latin adjective, referring to the distinctive antennae in this species.

COMMENTS: This species may be easily distinguished from other members of the subgroup by the elongate antennomere XI, similar to that in P. confusum . In addition, it differs in external characters from other members of the subgroup by the smooth metacoxal process and carinate mesoventrite. The lobed parameres and the shape of the tip of median lobe are similar to those in P. grossum , while the shape of the sclerotized structures of the internal sac are diagnostic.

Pseudobironium carinense ( Achard, 1920) Figs 11, 12, 81-83 Morphoscapha carinense Achard, 1920: 134 .

Psedobironium castaneum Pic, 1923a: 17 , syn. nov.

LECTOTYPE OF M. CARINENSE : ♀, MNHN, by present designation, labelled: Carin Chebà 900-1100. m. L.Fea V XII-88 (printed) / TYPE (printed, red) / Morphoscapha carinense n. sp. J. Achard det TYPE (handwritten by Achard, "J. Achard det." printed) / Lectotype Pseudobironium carinense (Achard) det. I. Löbl, 2013. Paralectotype ♀: NMPC, labelled: Carin Chebà 900-1100. m. L.Fea V XII-88 (printed) / Museum Paris Coll. A. Grouvelle 1915 (printed) / Morphoscapha carinense Achard Cotype (handwritten) / Mus. Nat. Pragae Inv. 18 722 / Paralectotype Pseudobironium carinense (Achard) det. I. Löbl, 2013.

TYPE MATERIAL OF M. CASTANEUM : Lectotype, Ƌ: MNHN, designated by Löbl, 1992: 504. It bears following labels: Lac Tho (handwritten by Pic / Type (handwritten by Pic) / castaneum n. sp. (handwritten by Pic) / TYPE (red, printed / Museum Paris Coll. M. Pic (printed / Lectotype Pseudobironium castaneum Pic det. Löbl, 1991.

ADDITIONAL MATERIAL EXAMINED: MYANMAR, labelled Carin Chebà 900-1100m. L. Fea V XII-88 (printed) [as the lectotype], 1 Ƌ, 1 ♀ ( MHNG) . – THAILAND, Mae Hong son, Rau Si Lang , 1-8.V.1992, 1 Ƌ leg. J. Horák ( MHNG) ; Chiang Mai, Doi Suthep , 1200m, 3.V.2004, 5 Ƌ, 1 ♀ leg. R. Grimm ( SMNS, MHNG) . – Same data but 24.IV.-13.V.2003, 1 Ƌ, 1 ♀ ( SMNS) . – Same data but 27-29.IV.2004, 5 Ƌ, 1 ♀ ( SMNS, MHNG) . – Chiang Mai, Doi Pui , 1600-1685m, 7-9.V.2004, 1 Ƌ leg. R. Grimm ( SMNS) . – C. Thailand, Khao Yai Nat. Park , 19-21.IV.1996, 2 Ƌ leg. S. Be č vá ř ( MHNG) . – S. Thailand, Krabi env., Wat Tam Sua , rain forest, 28.III.2008, 1 Ƌ leg. A. Pütz ( PCAP) . – LAOS, Kham Mouan Prov., Ban Khoun Ngeum ; env. 200m 18°07'N 104°29'E 19.-31.V.2001, 1 Ƌ leg. P. Pacholátko ( NHMB) . – Viangchan Prov., Phou Khao Khouay Nap. Park ,, Nam Leuk, env. Tad Leuk Waterfalls , 1.-8.VI. 1996, 200m, FIT (15c), 1 Ƌ leg. H. Schillhammer ( NHMW) . – VIETNAM, Hoa Binh Tonkin , 1 Ƌ leg. H. Perrot ( MHNG) . – Hoa Binh, 6 Ƌ ( MHNG) . – Tonkin , 1 Ƌ ( NMPC) . – Without locality data, 1 Ƌ ( NMPC) . – CHINA, Yunnan, Menla, Wangtianshu , 600m, 6.VI.2009, 5 Ƌ, 1 ♀ leg. Wen-Xuan Bi ( SNUC) . – With same data but 5.VI.2008, 5 Ƌ 4 ♀ leg. Liang Tang ( SNUC, MHNG) . – Menlun, Xipian , 985m, 1.VI.2009, 5 Ƌ, 1 ♀ leg. Wen-Xuan Bi ( SNUC) .

REDESCRIPTION: Length 3.45-3.60 mm, width 2.30-2.70 mm. Head and body uniformly, or almost uniformly dark reddish-brown, abdomen lighter apically, femora and tibiae about as dark as most of body, tarsi and antennae slightly lighter. Maxillary palpi with palpomere IV about 4 times as long as wide, tapering. Length ratio of antennomeres as II 15: III 11: IV 22: V 22: VI 16: VII 22: VIII 19: IX 20: X 20: XI 25; antennomere XI about 3.5 times as long as wide. Head with dense and fine, well delimited punctation. Pronotal punctures fairly fine, well delimited, with intervals mostly about as to three times as large as puncture diameters. Elytra lacking subapical hump and lateral impression, and without subapical impression. Elytral punctation coarser that pronotal punctation, excepted near base, with punctures mostly well delimited, puncture intervals mostly twice to four times as large as puncture diameters. Prohypomera distinctly punctate, lacking microsculpture. Mesoventrite very finely punctate on mesal and apical surfaces, lacking median ridge or line. Metaventrite not microsculptured. Median part of metaventrite hardly convex, densely punctate except on mesal area, punctures sharply delimited, with diameters to part about as large as puncture intervals. Lateral parts of metaventrite very finely punctate. Submesocoxal area distinctly shorter than half of interval to metacoxa. Metacoxal process tuberculate and finely punctate in middle, not microsculptured, impunctate laterally, with margin concave. Mesotibiae and metatibiae strongly curved, mesotibial ventral spur straight. Abdomen with strigulate microsculpture evanescent on basolateral parts of sternite 1; sternite 1 with shallow lateral impressions. Base of following sternite indistinctly, very finely wrinkled.

FIGS 80-83

(80) Pseudobironium antennatum sp. nov., aedeagus in lateral view; scale bar = 0.2 mm. (81-83) Pseudobironium carinense (Achard) , aedeagus in dorsal (81) and lateral (83) views, internal sac (82) in dorsal view; scale bars for aedeagus = 0.2 mm, for internal sac = 0.1 mm.

Male: Protarsus shorter than protibia, with tarsomeres 1 to 3 strongly widened, narrower than apex of protibia, bearing long tenent setae. Aedeagus (Figs 81-83) 1.34- 1.53 mm long. Median lobe with basal bulb large, longer than apical process, latter inflexed with weakly sinuate ventral side, tip in lateral view robust, not bent, obliquely truncate. Apical process with lateral tubercles. Parameres in dorsal view moderately wide, curved, narrowed toward apical fifth, somewhat widened and bent in apical fifth. Parameres in lateral view wide, in middle about as wide as middle of apical process, with ventral margin sinuate, distinctly concave in apical two fifth, dorsal margin weakly sinuate between base and apical third, expanded before apical fourth and appearing lobe-like, gradually narrowed toward apices. Internal sac with long mesal guide-sclerites, conical sclerites bearing single invaginated rod. Membranes of internal sac scale-like, with pair of small vesicles situated posterior guide-sclerites.

DISTRIBUTION: Myanmar, Thailand, Laos, Vietnam, China: Yunnan.

COMMENTS: This species is similar to P. grossum and other congeners with laterally tuberculate apical process of median lobe. It may be distinguished only by its male sexual characters, in particular by the shape of the parameres seen in lateral view. The identification of P. carinense is based on a male bearing the same locality data as the lectotype and sharing its external diagnostic characters. For records from Thailand see Löbl (1990: 514). The records of the species from Nepal ( Löbl, 1992: 504) are based on misidentified P. conspectum , see below.