Stenus bistigmosus, 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 : 591

publication ID	https://doi.org/ 10.5281/zenodo.5324778
persistent identifier	https://treatment.plazi.org/id/EB098780-5A1B-3822-9292-9461FEA9C2EC
treatment provided by	Carolina
scientific name	Stenus bistigmosus
status	sp. nov.

Treatment

Stenus bistigmosus View in CoL nov.sp. ( Figs 43 View Figs 26-45 , 69 View Figs 46-69 , 84, 86 View Figs 70-88 , 93 View Figs 89-107 )

T y p e m a t e r i a l: Holotype: TAIWAN: Taichung Hsien: Hsuehshan near Hsuehshan-Tun- Feng , 3170 m, 11.V.1991, leg. A SMETANA (T 76) . Paratypes: 1: Kaohsiung Hsien: Kuanshan, Kuanoshing Hut , 3020 m, 18.IV.1992, leg. A. SMETANA (T 92) ; 1: Kaohsiung Hsien: Peinantashan trail, 2500 m, 4.VII.1993, leg. A. SMETANA (T 136).- HT and 1 PT in coll. Smetana (Ottawa), 1 PT in cP .

D e s c r i p t i o n: Macropterous, black, slightly shiny, each elytron with a large, oval, orange spot in posterior half (fig. 43); punctuation of the forebody very coarse and very dense, on pronotum and elytra confluent, abdominal punctuation coarse and moderately dense anteriorly to fine and moderately sparse posteriorly; pubescence short, recumbent. Antennae brown, club infuscate. Maxillary palpi yellowish, segment 3 infuscate. Paraglossae coniform. Legs reddish brown, nearly the apical half of the femora and the apices of tarsal segments infuscate. Clypeus black, labrum black, anterior margin brown, moderately densely pubescent.

Length: 6.3-7.3 mm (forebody: 3.2 mm).

PM of the HT: HW: 55; DE: 30; PW: 40.5; PL: 46; EW: 50; EL: 56; SL: 44; SpL: 24.

M a l e: Very similar to S. bilunatus , but the apical notch of sternite 8 less deep (41.5: 2), apicolateral teeth of sternite 9 shorter (fig.86). Anterior portion of the median lobe different (fig. 69), expulsion clasp narrower and differently shaped anteriorly (figs 84, 93).

F e m a l e: Similar to that of S. bilunatus .

C o m p a r a t i v e n o t e s In many respects closely resembling S. bilunatus , but the head distinctly broader than elytra, the elytral spot much larger, and the abdominal punctuation less coarse and distinctly sparser: on tergite 4 interstices on the average slightly larger than punctures, in tergite 7 punctures are smaller than eye facets near dorsal eye margins, interstices much larger (becoming twice and more as large) than punctures.

Variability: In the paratype from the Peinantashan trail nearly the whole elytra are darkorange.

E t y m o l o g y:" bistigmosus " (Lat.) = with two (orange) stigmata.

For identification amongst the Taiwanese species see key.