Stenus aspriformis, Puthz, 2013

Puthz, V., 2013, Further new Stenus LATREILLE from Taiwan (Coleoptera, Staphylinidae) th, Linzer biologische Beiträge 45 (1), pp. 885-891 : 887-888

Stenus aspriformis nov.sp. (Figs 2, 5, 10, 11)

T y p e m a t e r i a l Holotype (3) and 633, 9♀♀ - paratypes: TAIWAN: Taichung Hsien, Anmashan , 2120m, 1.V.1990, A. Smetana ( T 35 ); 13, 4♀♀ -parataypes: Taichung Hsien, Hsiaohsueh Shan, 2650-2750m, 1.V.1990, idem ( T 349 ).- HT and PTT in coll. A. Smetana (Ottawa), PTT also in cP, coll. Tang (Shanghai) and coll. Naomi (Kyushu).

D e s c r i p t i o n: Brachypterous, black with a slight brownish hue, moderately shiny, forebody coarsely and very densely punctate, pronotum and elytra uneven, abdomen moderately coarsely and moderately densely punctate; pubescence very short, indistinct. Segment 1 of maxially palpi yellow, segments 2 and 3 yellowish brown. Antennae yellowish brown, club infuscate. Legs reddish brown, apical portion of femora and of tibiae narrowly infuscate, tarsi brown. Clypeus black, labrum dark brown, moderately sparsely pubescent.

Length: 3.8-4.7mm (forebody: 1.9-2.1mm).

PM of the HT: HW: 39.8; DE: 20; PW: 30.5; PL: 31; EW: 38; EL: 36.5; SL: 28.

M a l e: About as in S. aspripennis , but the metasternum denser punctate (fig. 10) and the impression of sternite 4 deeper. Aedeagus (fig. 2) similar to that of S. aspripennis , the apical portion of median lobe slightly less triangular; parameres with about 14 apical setae.

F e m a l e: Similar to that of S. aspripennis , but the punctuation of the metasternum denser and slightly coarser (fig. 11). Spermatheca (fig. 5), infundibulum longer.

In many respects similar to S. aspripennis , but the longitudinal furrows of frons broader and less deep, the median portion distinctly but less elevated and only narrowly impunctate; punctuation in average coarser, diameter of punctures mostly nearly as large as apical cross section of antennal segment 2, interstices also distinctly narrower than half diameter of punctures. Antennae as in the compared species. Pronotum similar to that of S. aspripennis , sides strongly convex, less concave behind; surface also uneven, but impressions less deep; punctuation more regular, very dense. Elytra subtrapezoid, although broader than long longer than in S. aspripennis , suture contiguous, impressions less deep; punctation very coarse and very dense, more regular than in the compared species. Abdomen with the paratergires distinctly bent ventrad; punctuation of tergites slightly coarser anteriorly than posteriorly, punctures on tergite 7 about as large as basal cross section of antennal segment 3, interstices as large as punctures. Legs and reticulation similar to that of S. aspripennis .

C o m p a r a t i v e n o t e This new species may be distinguished from its close relatives as indicated in the key below.

E t y m o l o g y: Because of the uneven suface of the forebody I name this new species " aspriformis " (Lat. = with uneven/rough habitus).