Stenus electristigma, Puthz, 2011

Puthz, V, 2011, On the Stenus LATREILLE 1797 from Taiwan with spotted elytra including remarks on the S. gestroi-group (Coleoptera, Staphylinidae) (316 Contribution to the Knowledge of Steninae), Linzer biologische Beiträge 43 (1), pp. 565-596 : 580-581

Stenus electristigma nov.sp. ( Figs 31, 32 , 113, 117, 121 )

T y p e m a t e r i a l: Holotype and 1, 1 - paratypes: TAIWAN: Taichung Hsien: Hsiaohsue Shan 2650-2750 m, 1.V.1990, leg. A. SMETANA (T 34) . Paratypes: 1: Hualien Hsien: Taroko N. P., Duodyatunshan 2650 m, 13.V.1990, leg. A. SMETANA (T 56) ; 1: Hualien Hsien: Tayulin, 21.VI.1996, leg. H. MAKIHARA. HT and 2 PTT in coll. A. SMETANA, 1 PT in coll. NAOMI and 1 PTincP .

D e s c r i p t i o n: Micropterous, black with a faint brownish hue, each elytron with a slightly elevated oval yellowish spot (fig. 31), moderately shiny, coarsely and densely punctate; pubescence short, recumbent. Antennae yellowish, club infuscate. Maxillary palpi yellow, segment 3 slightly infuscate. Paraglossa oval. Legs reddish brown. Clypeus black, labrum dark brown, moderately densely pubescent.

Length: 4.0- 5.4 mm (forebody: 2.0- 2.2 mm).

PM of the HT: HW: 36; DE: 20; PW: 28; PL: 30; EW: 33; EL: 33; SL: 24.

M a l e: Legs simple. Metasternum broadly and shallowly impressed, moderately coarsely and densely punctate, interstices reticulate, nearly as large as punctures. Anterior sternites simple, sternite 7 with an oval median impression, which is finely and densely punctate and pubescent, posterior margin very shallowly emarginated. Sternit 8 apically with a round emargination about one ninth as long as the sternite. Sternite 9 acute apicolaterally. Tergite 10 rounded. Aedoeagus (fig. 117), apical portion of median lobe triangularly pointed, expulsion hooks large, separate, tubous internal sac very long; parameres longer than median lobe, narrowed at apex, with 7-8 subapical setae.

F e m a l e: Sternite 8 rounded at posterior margin. Valvifer acute apicolaterally (fig. 121). Tergite 10 rounded apically. Spermatheca (fig. 113), spermathecal duct very long, weakly sclerotized.

Head broader than elytra, frons broad with two broad and shallow longitudinal furrows, median portion a little narrower than each of the side portions, moderately elevated, not extending to the level of dorsal eye margins; punctuation coarse and very dense, punctures about as large as maximum cross section of antennal segment 3, interstices much smaller than half diameter of punctures, slightly larger in actual middle of the median portion. Antennae slender, when reflexed extending to the posterior margin of pronotum, penultimate segments nearly twice as long as broad, segment 11 a little longer than segment. 10. Pronotum slightly longer than broad, broadest slightly behind middle, sides convex anteriorly, concave posteriorly; a transverse impression about lateral middle and a very short longitudinal impression in actual middle present; punctuation coarse and very dense (can be very slightly confluent), largest punctures as large as basal cross section of antennal segment 2, interstices smaller than half diameter of punctures, larger in the median impression. Elytra trapezoid, as long as broad, shoulders oblique, posterior margin deeply emarginated; humeral and sutural impressions shallow; the orange spot in lateral half of each elytron is at most half as long as one elytron and somewhat elevated; punctuation very coarse and very dense. Abdomen elliptic, paratergites narrow, declining ventrad, almost impunctate, those of tergite 4 nearly as broad as antennal segment 2 (fig. 32), basal furrows of anterior tergites deep, tergite 7 with a more or less distinct membranous fringe apically; punctuation coarse (anteriorly) to moderately coarse (posteriorly) and moderately dense: on tergite 4 punctures are as large as basal cross section of antennal segment 3, interstices on the average about as large as punctures; on tergite 7 punctures are as large as eye facets near dorsal eye margin, interstices slightly larger than punctures; tergite 10 moderately finely, sparsely punctate. Legs slender, metatarsi about two thirds as long as metatibiae, segment 1 a little shorter than the three following segments combined, much longer than the last segment; segment 4 deeply bilobed. The whole body is deeply reticulate.

C o m p a r a t i v e n o t e s: This new species belongs to the group of S. indubius SHARP ( NAOMI 2006) , in which it is remarkable by the elytral sports. It is very close to S. makiharai nov.sp., from which it may be distinguished by the broader head, the coarser abdominal punctuation and the spermatheca.

For identification amongst the Taiwanese species see key.

E t y m o l g y:" electristigma " (Lat.) = with amber stigmata.

Figures

Figs 26-45: Elytra (26, 28, 30, 31, 33-43), dorsal and lateral aspect of abdominal segments (27, 29, 32, 44) and ventral aspect of abdominal segments 6 and 7 (45) of Stenus mithracifer nov.sp. (26, HT; 27, PT), S. electrigemmeus nov.sp. (28, HT; 29, PT), S. electrigemmatus nov.sp. (30, HT), S. electristigma nov.sp. (31, HT; 32, PT), S. shibatai nov.sp. (33, HT), S. shibataiellus nov.sp. (34, HT), S. shibataianus nov.sp. (35, HT), S. stigmifer nov.sp. (36, HT; 37, PT, T 24), S. bilunatus PUTHZ (38, T 86), S. bigemmatus nov.sp. (39, HT), S. bigemmosus nov.sp. (40, HT), S. bilunatior nov.sp. (41, PT, T 127), S. bilunatoides nov.sp. (42, PT, T 155), S. bistigmosus nov.sp. (43, HT), S. miwai BERNHAUER (44, Henglou), S. bicolon SHARP (45, Tengchih).

Figs 108-121: Ventral aspect of aedeagus/apical portion oft the median lobe (108-111, 114, 116- 119), spermatheca (112, 113, 15), apical portion of valvifer (120, 121) of Stenus mithracifer nov.sp. (108, HT), S. shibatai nov.sp. (109, PT), S. shibataianus nov.sp. (110, HT; 112, 120, PTT), S. shibataiellus nov sp. (111, HT), S. electristigma nov.sp. (113, 117, 121, PTT), S. cirricinctus PUTHZ (14, HT), S. arisanus CAMERON (115, Alishan), S. electrigemmeus nov.sp. (116, HT), S. stigmosus nov.sp. (116, PT), S. stigmifer nov.sp. (119, HT). Scale bar = 0.1 mm (108 = 109-115, 120, 121; 116 = 117-119).