Stenus bicolon SHARP 1889

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 : 592

Stenus bicolon SHARP 1889 ( Figs 23 , 45 )

Stenus bicolon SHARP 1889: 328 ; PUTHZ 1968: 46 fig.

Stenus posticus FAUVEL 1895 ; SAWADA 1965: 147.

M a t e r i a l s t u d i e d: TAIWAN:1: Nantou Hsien: near Meifeng , 19.IV.1977, W. Suzuki (cSh) ; 1: Meifeng , 29.V.1980, H. Makihara (cN) ; 1: Hualien Hsien: Pilu-Shenmu (2400 m), 19.VIII.1978, Y.Sibata (cSh) ; 1: Chiai Hsien: Fenchihu 1500 m, 2.- 3.7.1982, N. Nishikawa (cN) ; 1: ibidem, 23.V.1995, K. Matsuda (cSh); 1: Kaohsiung Hsien: Tengchih ner Liukuei , 3.V.1983, A. Saito (cP). Sawada records the species from Rimogan-Magan [= Fushan, Taipei Hsien] .

M a l e: Mesotibiae with a strong preapical tooth, metatibiae with a smaller preapical tooth. Metasternum feebly shallowed, triangularly elevated in posterior middle, which is very densely punctate and pubescent. Anterior sternites simple, sternite 7 with a narrow, sharply carinated impression in posterior middle (fig. 45), coarsely and densely punctate, posterior margin shallowly emarginate. Sternite 8 apically with a shallow emargination about one twelfth as long as the sternite. Sternite 9 acute apicolaterally. Tergite 10 rounded. Since the apical portion of the median lobe is rounded (not obtuse or slightly concave), the Taiwanese specimens belong to the nominate form and not to S. bicolon posticus FAUVEL as has been suggested previously.

F e m a l e: Sternite 8 rounded posteriorly. Spermatheca (fig. 23).

This species belongs to the S. abdominalis -group.

Figures

Figs 11-25: Pronotum (11, 12), expulsion hook (13), dorsal aspect of abdominal segments 6 and 7 (14, 15), spermatheca (16, 20-25), lateral portion of median lobe (17), ventral aspect of a detail of the anterior portion of median lobe (18, 19) of Stenus gestroi FAUVEL (11, Carin Cheba; 12, Arni Gad; 13, 17, Tokara Is.; 14, Nanshanchi; 15, Peiyuan), S. electrigemmeus nov.sp. (16, PT 152; 18, HT), S. electrigemmatus nov.sp. (19, HT), S. mithracifer nov.sp. (20, PT), S. miwai BERNHAUER (21, Mt. Karapin), S. virgula FAUVEL (22, Lebong), S. bicolon posticus FAUVEL (23, Malaysia: Bringchang), S. stigmosus nov.sp. (24, PT, T 3) and S. stigmifer nov.sp. (25, PT, Kaolin).

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).