Stenus (Nestus) labilis Erichson 1840

Stenus (Nestus) labilis Erichson, 1840 (Fig. 1E) Stenus labilis Erichson, 1840: 697. Stenus labilis – Thomson 1857: 223. — J. Sahlberg 1871: 415. — J. Sahlberg 1900: 29. — L. Benick 1921a: 146. — Puthz 1971b: 34. — Silfverberg 1988: 21 <types of lapponicus J. Sahlberg, 1876>. — Sokolov 2003: 1272. — Shavrin & Puthz 2007: 122. Stenus labilis <?!> – Fauvel 1865: 306. — Iljin 1926: 225. Stenus (Nestus) labilis – Poppius 1909b: 19. — Jakobson 1909: 481. — Renkonen 1935: 29. — Palm 1961: 90, 98. — Puthz 1967a: 49. — Puthz1967d: 293. — Tichomirova 1973: 173. — Shilov 1975: 58. — Ryvkin 1987: 159. Stenus (Nestus) labilis <?!> – Poppius 1909a: 17. Stenus (s. str.) labilis – Campbell & Davies 1991: 111. Stenus canaliculatus – C. Sahlberg 1832: 428. Stenus lapponicus J. Sahlberg, 1876: 56. Stenus lapponicus – J. Sahlberg 1880: 78. — Heyden 1881: 78. — J. Sahlberg 1899: 340. Stenus (Nestus) lapponicus – Jakobson 1909: 481. — Hansen et al. 1939: 32 (pars). Stenus latipennis – Renkonen 1941: 105. Material examined FINLAND: 1 ♂, ‘Lac. Kemi’ <printed on yellowed white rectangle>, ‘J. Sahlb.[erg]’ <printed on yellowed white rectangle>, ‘77’ <hand-written with Indian ink on grey square>, ‘ St. labilis Er. typ (= lapponicus J. Sahlb.) <black Indian ink> J. Sahlberg det. <printed in italics>’ <common determinative label by J. Sahlberg> (ZIN); 1 ♀, ‘ Turtola’ <printed on yellowed white rectangle>, ‘J. Sahlb.[erg]’ <printed on yellowed white rectangle>, ‘ Stenus lapponicus ’ <black Indian ink> (ZIN); 1 ♂, ‘ Tenojoki’ <printed on yellowed white rectangle>, ‘J. Sahlb.[erg]’ <printed on yellowed white rectangle>, ‘ St. labilis Er. (= lapponicus J. Sahlb.)’ <black Indian ink>, ‘c.[ollection] of A. Jakovlev’ <printed label in Russian> (ZIN). RUSSIA: 1 ♂, Arkhangelsk Area, 10 km N of Naryan-Mar, near Iskateley, sandy bank of Pechora River, 14 Jul. 1988, P.K. Yeryomin leg. (AR); 1 ♂, Arkhangelsk Area, 5 km S of Naryan-Mar, bank of right confluent of Pechora River, on silt, 19 Jul. 1988, P.K.Yeryomin leg. (AR); 1 ♀, Arkhangelsk Area, Naryan-Mar, swamp, 29 Jul. 1988, P.K. Yeryomin leg. (AR); 1 ♂, Arkhangelsk Area, Nenetzkiy Autonomous Region, Pechora River delta, sedge meadow at lake shore, 7 Sep. 1998, N.S. Mazura leg. (AR); 1 ♀, ‘ Yugorskiy Shar, near Velikaya River, tundra, 27.viii.1921, E. Abakumova leg.’ <in Russian>, ‘ labilis Er. L. Benick det.’ (ZIN); 1 ♂, Arkhangelsk Area, near Amderma, flood-plain of Amderminka River, on silt, 9 Jul. 1988, P.K. Yeryomin leg. <the specimen destroyed by dermestids, remained on cotton> (AR); 1 ♂, South of Yamal Peninsula, 110th km by railway N off Obskaya station, puddle, 6 Aug. 2001, P. Petrov leg. (AR); 1 ♂, W Siberia, Salekhard, Poluy River bank, 27 Jun. 1954, I. Telishev leg. <det. V. Puthz, 1971> (ZMMU); 1 ♂, Yamalo-Nenetskiy Autonomous Region, nr. Salekhard, 5 Jul. 1940 (AR); 1 ♀, Muzhi-na-Obi, 23 Jun. 1952, I. Telishev leg. (ZMMU); 1♂, Beryozov, 13 Jul. 1932, Telishev leg. <det. V. Puthz, 1971, with earlier determinative label by unknown author: ‘ Nestus melanarius Steph. ’> (ZMMU); 7 ♂♂, 12 ♀♀, Khanty-Mansi Autonomous Region, near Shapsha, 61.085°N 69.458°E, 42 m a.s.l., 1–4 Aug. 2010, K. Tomkovich leg. (AR, ShIN); 1 ♂, Khanty-Mansi Autonomous Region, Surgutskiy District, Surgutskiy Refuge, Ob’ River basin, Materikovyi Pasl Channel, bank of rill flowing into channel: near water (clay), Carex sp., Poaceae gen. sp., Veronica? longifolia, Asteraceae, small mosses, 8 Aug. 2000, A.B. Ryvkin leg. (AR); 1 ♂, Khanty-Mansi Autonomous Region, Surgutskiy District, Yuganskiy Nature Reserve, Malyi Yugan River, near cordon below Lyarykni River mouth, on sand and clay and in grass litter among Carex spp. at river bank, 15 Aug. 2003, A.B. Ryvkin leg. (AR); 1 ♂, 1 ♀, Tyumen Area, Uvatskiy District, 10 km S of Gornoslinkino, near Tobolsk Field Research Station of Severtsov Institute, among Carex spp. on flood-plain of Varpak River, 25 Sep. 2003, A.B. Ryvkin leg. (AR); 2 ♂♂, 4 ♀♀, SW Taimyr, upper reaches of Nizhnyaya Agapa River, Nyapan Ridge, 70°04´N 87°36´E, detritus at shore of Ladannakh Lake, 17 Jul. 2001, A.V. Sokolov leg. (AVS); 1 ♀, same locality and collector, shingle bed, 2 Jul. 2001 (AVS); 2 ♂♂, 3 ♀♀, same locality, soil traps on swamp, 8 Jul.–15 Aug. 1999, O. Makarova leg. (AVS); 1 ♂, 1 ♀, Taymyr, Tammot Lake, 10 km ENE of Lukunskoye cordon, on silt under flood-plain, Salix sp., 15 Jul. 1989, P.K. Yeryomin leg. (AR); 1 ♂, same locality, slightly silty sandy lake shore with small shingles, 24 Jul. 1989, P.K. Yeryomin leg. (AR); 1 ♀, Taymyr, island on Khatanga River, 10 km NE of Oboynaya Village, slightly silty sandy river bank, 19 Jul. 1989, P.K. Yeryomin leg. (AR); 1 ♂, Taymyr, Maymecha River mouth, Yantardakh Mount, 7 Jul. 1971 A.P. Rasnitsyn, A.G. Ponomarenko, I.D. Sukatcheva, V.V. Zherikhin leg. (AR); 1 ♂, 1 ♀, Taymyr, Khatangskiy District, Taymyr Nature Reserve, Ary-Mas: right bank of Novaya River, lake ESE of Ulakhan-Yuryakh River mouth, mosses, litter and sweeping at lake shore: Carex spp., Comarum palustre etc., 20 Jul. 1992, A.B. Ryvkin leg. (AR); 1 ♂, Taymyr, Khatangskiy District, Taymyr Nature Reserve, Ary-Mas: Novaya River basin, Bogatyr’- Yuryakh River near mouth, steep river bank and high river plain, clay, drift, Poaceae gen. sp., Carex spp., Salix spp., Alnus fruticosa, Ribes sp., 21 Jul. 1992, A.B. Ryvkin leg. (AR); 5 ♂♂, Taymyr, Khatangskiy District, Taymyrskiy Nature Reserve, Ary-Mas: left bank of Novaya River near field research station, river bank, sand with thin layer of silt and drift near water, 22 Jul. 1992, A.B. Ryvkin leg. (AR). CANADA: 2 ♀♀, ‘NWT, Loc. 06-77, Anderson River delta, Boat Island, Salix alexensis zone: traps, 26 Jun.–15 Jul 1977, D. Shpeley, G.E. Ball leg. (Anderson River Exp. – 1977)’ (UASM). Remarks This species was named by Erichson (1840) from ‘Fennia’, having been misidentified earlier by C. Sahlberg (1832) as S. canaliculatus Gyllenhal, 1827; redescribed as S. lapponicus J. Sahlberg, 1876 from Finland (up to 68°30’N), but cited as labilis (only!) by J. Sahlberg (1900) in his catalogue of the beetles of the fauna of Finland. Only the Norwegian, Swedish, Finnish, and N Russian records (Thomson 1857; J. Sahlberg 1871, 1899, 1900; Poppius 1909b; Jakobson 1909; Palm 1961; Puthz 1971b) seem to be reliable for the European range of the species. The records for France/Italy (Fauvel 1865), as well as for the Yekaterinoslav Government (=Dnepropetrovsk Area) of the Ukraine (Iljin 1926), are to be regarded as results of misidentification. In Western and Central Siberia, S. labilis has been known from Polar Ural to W Taymyr (J. Sahlberg 1880, L. Benick 1921a, Puthz 1967a, Shilov 1975, Sokolov 2003 <the latter is based on my identifications>). Puthz (Shavrin & Puthz 2007), without new material, considers the species to be distributed in E Siberia, but the only record by Poppius (1909a), for the Lena basin (‘Mehrere Exemplare auf feuchten, Moos-bewachsenen Wiesen auf der Insel Agrafena, 1.VIII!.’), has been confirmed by neither subsequent authors nor my vast material from this spacious territory. Thus, S. labilis is unlikely to be represented in Siberia eastwards of E Taymyr. The new material above confirms the distribution of the species in N America (Campbell & Davies 1991: Alaska, Yukon Territory, Northwest Territories). Most captures known to me are confined to alluvial habitats.

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