Stenus (Nestus) illusor Ryvkin 1987

Stenus (Nestus) illusor Ryvkin, 1987

(Figs. 5B, 7B)

Stenus (Nestus) illusor Ryvkin, 1987: 155.

RUSSIA: 1 ♀, Amur Area, Selemdzhinskiy District, Selemdzha River basin, Angelokit River, 52°53.497’N 132°24.543’E, 430 m a.s.l., mosses and litter under Salix spp. and Alnus sp. with Poaceae gen. sp., Sphagnum squarrosum, Sph. sp., Plagiomnium sp., etc. in flood-plain, 3 Jul. 2007, E.M. Veselova & A.B. Ryvkin leg. (AR). – 1 ♂, Amur Area, Selemdzhinskiy District, Selemdzha River basin, Angelokit River near mouth, 52°53.49’N 132°24.5’E, 420 m a.s.l., mosses and litter under Populus sp., Padus sp., Alnus sp., Abies nephrolepis, Picea ajanensis, etc. with Spiraea spp., Swida alba, Rosa sp., Rhododendron sp., sparse Betula platyphylla, Poaceae gen. spp., Carex spp., Smilacina davurica, Pyrola daurica, Trientalis europaea, etc. in flood-plain forest, 4 Jul. 2007, E.M. Veselova & A.B. Ryvkin leg. (AR); 1 ♀, Amur Area, Selemdzhinskiy District, left side of Selemdzha River, 3 km below Butov Kamen’ rapid, gorge with waterfall, 52°50.94’N 132°11.44’E, 400 m a.s.l., mosses and litter on stones and rocks near, above and below the waterfall, 8 Jul. 2007, E.M. Veselova & A.B. Ryvkin leg. (AR). – 1 ♂, Khabarovsk Territory, Verkhnebureinskiy District, island on Niman River 700 m upstream of Niman cordon of Bureinskiy Nature Reserve, 1040 m a.s.l., mosses and leaf litter in floodplain forest with Populus sp., Salix sp., Spiraea spp., Sorbaria sorbifolia, Poaceae gen. spp., Carex spp., Sphagnum sp., Polytrichum sp., Hylocomium splendens, etc., 11 Aug. 2008, A.B. Ryvkin leg. (AR); 1 ♂, 1 ♀, Magadan Area, 2 km W of Splavnaya, №236, 2 Sep. 1981, A. Ryabukhin leg. (AR); 1 ♀, Magadan Area, 35 km N of Magadan, №184, 16 Aug. 1981, A. Ryabukhin leg. (AR); 1 ♀, same locality, №194, 20 Aug. 1981, A. Ryabukhin leg. (AR); 1 ♀, Kamchatka, Esso, flood-plain of Bystraya River, 27 Jun. 1975, B.A. Korotyayev leg. (AR); 1 ♀, Chukot Peninsula, Anadyr River basin, Novyi Yeropol, middle flood-plain, osier-bed with Poaceae on silty clay sand: soil trap, 15 Jul. 1986, E.G. Matis leg. (AR).

The species was previously known only for the male holotype: ‘Khabarovsk Territory, Amur basin, Lyanchli River, confluent of Gorin River, 5.ix.1975, O.N. Kabakov leg.’ (ZIN). Based on the new material, I regard it as being widely distributed across the Russian Far East, except the southernmost territories.