Borolinus bisetifer, Wu & Zhou, 2006

Wu, Jie & Zhou, Hong-zhang, 2006, Description Of A New Species Of Borolinus Bernhauer (Coleoptera: Staphylinidae: Osoriinae) From Yunnan, China, With Two New Records From Southern China, Raffles Bulletin of Zoology 54 (2), pp. 215-223 : 216-218

Borolinus bisetifer , new species

( Figs. 1-11 )

Material examined. – Holotype- male, China, Yunnan, Xishuangbanna, Menglun , 810 m, 10 Feb.2004, Jie Wu coll.( IOZ- CAS) .

Paratypes. – 1 male, 5 females, China, Yunnan, Xishuangbanna, Menglun , 810 m, 10 Feb.2004, Jie Wu & Jiantao Yin coll.( IOZ- CAS) ; 1 male, same data as in other paratypes ( ZRC) .

Description. – Body not so depressed as in other species of the genus. Head dark red. Pronotum and elytra red. Abdomen almost dark red except three black terminal segments. Femora, tibiae and tarsi reddish. Antenna dark red.

Head ( Fig. 1 ) transverse, in front furnished with two parallel inner lateral teeth, which are distinctly projecting and pointed, almost reaching apical 2/3 of mandibles viewed from above; frontal depression between inner lateral teeth, deep, slightly longer than wide; outer lateral tooth situated at outer base of inner lateral tooth, triangularly pointed and broadly depressed at its base; lateral lobe situated between eye and outer lateral tooth, not gibbous. Vertex smooth, not sulcate, only in middle of base with an indistinct longitudinal fovea; along lateral and postero-lateral margin with some scattered punctures and long golden pubescence. Eyes glabrous, moderately convex. Clypeus steeply elongate, medially with one pair of long setae.

Labrum ( Fig. 8 ) transverse, with two long and ciliate submembranous lobes projecting anteriorly, anterior margin furnished with 6 pairs of setae of various length, behind them in middle with two additional pairs of long setae. Mandibles extremely protruding ( Fig. 6 ), apical tooth pointed, immediately behind which with two sharp teeth on dorsal side and one sharp tooth on inner side. Inner lobe of maxillae ( Fig. 10 ) with one slim and pointed tooth at apex, behind this tooth remaining inner side with dense ciliae in transverse rows; outer lobe hatchet-shaped, anterior half with dense ciliae in rows. Mentum ( Fig. 9 ) trapeziform and setose, depressed laterally, in middle of front margin with a broad protruding denticle, apically ciliated. Paraglossa and glossa ( Fig. 11 ) ciliate anteriorly, not separated from each other.

Antennae long, posteriorly reaching shoulder of elytra, weakly geniculate, 1 st segment baculiform, apically emarginate to hold 2 nd segment, about as long as 2 nd- 4 th segments combined, 2 nd smallest, almost quadrate, 3 rd long and narrowed at base, twice as long as 2 nd, 4 th- 6 th slightly elongate, 7 th- 9 th moniliform, 10 th slightly transverse, 11 th conical, bluntly pointed, about 2 times as long as 10 th. In addition to usual setae, segments 6 th- 11 th with tomentose pubscence, gradually becoming denser toward apex.

Pronotum transverse, its frontal margin regularly emarginate, sides parallel, median longitudinal sulcus narrow, almost covering whole length of pronotum, disc of pronotum with finely vermiform microsculpture and on each side of sulcus with a distinct puncture; lateral line continuing, but turning upward at anterior angle, vanishing before reaching middle, basally bent dorsad at hind angle, forming curved ridge, continuing along posterior constriction and reaching basal line; sides of pronotum, along lateral line, with moderately dense setiferous punctures and golden setae, especially denser at posterior angle.

Protibiae externally with 13-15 denticles, which gradually becoming shorter basally. Middle and hind tibiae densely setose.

Elytra almost quadrate, disc with distinctly coriaceous micropunctures, slightly expanding laterally at posterior part, posterior margin weakly emarginate, small setiferous punctures moderately dense along lateral margin.

Abdomen cylindrical, weakly broadened to 7 th segment, 3 rd- 6 th segments with anterior and posterior row of long golden setae, these setae denser at lateral side, but gradually becoming sparser medially, 7 th and 8 th irregularly covered with long golden setae, but in middle of 7 th with a broad glabrous region.

Male. Aedeagus ( Fig. 2, 3 ) with median lobe slightly bulbous at base, curved behind basal orifice, posterior part baculiform, rounded at apex and weakly sclerotized on dorsal side; basal orifice roundly emarginate above, parameres short, thin and pointed, with basal part protruding dorsally and connecting each other to form a characteristic triangular structure, apically emarginate. Ninth tergite ( Fig. 7 ) sclerotized with left and right plates separated, each with 8 or 9 setae of various length. Tenth tergite almost membraneous except for sclerotized apical part, posterior margin emarginate in middle, with 3 pairs of setae. Ninth sternite ( Fig. 4 ) composed of two plates, apical plate sclerotized except for membraneous apex, with two long setae, basal plate less sclerotized, broadened in middle.

Female. Ninth sternite ( Fig. 5 ) with hemisternite less sclerotized, anterior margin not strongly rounded, second gonocoxite strongly sclerotized except for membraneous apex, with one stout seta.

Measurements. – Body length: 14-16 mm; HL: 0.78 mm; HW: 1.62 mm; PL: 1.92 mm; PW: 2.46 mm; EL: 2.34 mm; EW: 2.52 mm.

Etymology. – The species name is a combination of the Latin prefix “ bi- ” and the adjective “ setifer ” to indicate the pair of setae on the clypeus.

Remarks. – This new species can be easily distinguished from B. semirufus by having one pair of outer lateral teeth, and from other Chinese species by the reddish coloration and the clypeus having only one pair of long setae. This species is similar to B. antilope Fauvel, 1895 , but can be distinguished by the more reddish head and abdomen, and by the pronotum having two distinct punctures on each side of the median sulcus.

Distribution. – China (Yunnan).

Figures

Figs. 1-11. Borolinus bisetifer, new species: 1, head and pronotum in dorsal view; 2, aedeagus in dorsal view; 3, aedeagus in lateral view; 4, 9th abdominal sternite of male; 5, left half of 9th abdominal sternite of female; 6, mandibles; 7, 9th and 10th abdominal tergites of male; 8, labrum; 9, mentum; 10, maxilla; 11, ligula and labial palpi. Scale bars: Figs. 1, 6 = 1 mm; Figs. 2-5, 7-10, 11 = 0.25 mm.