Brathinus oculatus Lewis, 1886

Figs 2, 9, 13; Map 3.

Brathinus oculatus Lewis, 1886: 85 (type locality: Japan, Hokkaido, Yezo, district of the Ishikari River); Hammond, 1971: 68; Watanabe, Sato, 1981: 618; Lafer, 1989: 346; Watanabe, 1990: 247; Herman, 2001: 272; Brathinus japonicus Nakane, 1961: 3 (type locality: Japan, Hokkaido, Sapporo); Nakane, 1963: 82.

MATERIAL. 1 specimen: 1.5 km upper mouth of Severyanka river, 44°19´58´´N 146°1´15´´E, 10.08.2017, Yu.N. Sundukov leg. (MSPU); 4 specimens: Saratovskaya River near Tyatina River, 44°16´28´´N 146°07´09´´E, 5– 8.07.2014, Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 24 specimens:between Saratovskaya and Tyatina Rivers, 44°15´56´´N 146°08´37´´E, 21– 25.07.2014, Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 2 specimens: lower reaches of Saratovskaya river, 44°15´57´´N 148°06´23´´E, 2– 4.07.2014, Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 1 specimen: same data, 10– 16.08.2014 Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 6 specimens:lower reaches of Filatova River, 22– 27.06.2013, Yu.N.Sundukov leg.; 2 specimens: Aliger Lake, floodland forest of Alnus and Lysichiton, 31.07.1994, Yu.Eskov leg. (MSPU); 6 specimens: cordon Alekhinsky, 28– 30.09.2014, Yu.N.Sundukov leg.; 2 specimens:lower reaches of Sernovodka river,swamp, 43°54´54´´N 145°38´11´´E, 10.08.2014,Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 2 specimens: east shore of Glukhoe Lake, 43°54´11´´N 145°38´12´´E, 9.07.2008,K.V. Makarov leg (MSPU); 1 ♀: Alyokhino, 01.06.2011, I.V. Melnik leg. (MSPU); 2 specimens: Alyokhino, 11– 14.09.2014, Yu.N. Sundukov leg. (MSPU); 16 specimens: Ozyorniy kordon, 7– 9.07.2013, Yu.N. Sundukov, L.A. Sundukova (MSPU); 6 ♂♂, 7 ♀♀: Ozyorniy kordon, 23– 24.04.2018, Yu.N. Sundukov (CS, MSPU); 9 specimens: west shore of Goryacheye Lake, 7– 10.07.2017, Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 3 specimens: southwest shore of Goryacheye Lake, 30.VI– 3.07.2016, Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 2 specimens: south shore of Goryacheye Lake, 43°52´26´´N 145°628´58´´E– 43°52´08´´N 145°31´20´´E, 27– 29.06.2013, Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 2 specimens: lower reaches of Ozyornaya river, 43°52´37´´N 145°28´19´´E, 6.09.2014, Yu.N. Sundukov leg. (MSPU); 3 specimens: Ivanovskiy Cape 2 km south of Grozovoye, 43°49’28´´N 145°24´09´´E, 2.06.2015, Yu.N. Sundukov leg. (MSPU); 9 specimens: env. Dubovoye, 25– 26.07.2017, Yu.N. Sundukov, L.A. Sundukova leg. (MSPU); 3 ♂♂, 2 ♀♀: watershed of Golovnin and Khlebinov rivers, 25– 29.09.2015, Yu.N. Sundukov leg. (CS, MSPU); 1 ♀: [without exact locality] 21.07.1981. D. Emelyanov leg. (CS).

ADDITIONAL MATERIAL. RUSSIA: 1 ♀: Sakhalin, YuznoSakhalinsk, botanical garden, 16.06.2018, Yu.N. Sundukov leg. (CS) ; 1 specimen: Yu. Sakhalin, left source of Elanka River, 46°56´50´´N 142°48´43´´E, 31.07.2017, K.V. Makarov leg. (MSPU) ; 1 specimen: 30 km W Aniva, Bryanka River, 14.07.1993, A. Pütz, D. Wrase leg. (NHMW) ; 1 specimen: Aniva district, Kamyshoviy Mts. [without collector name] (NHMW) ; 1 specimen: Yu. Sakhalin, 14 km WNW Lesnoe, valley Peskovka river, 46°57´33´´N 142°54´34´´E, 23–30.VI.2003, I. Melnik leg (MSPU) .

DISTRIBUTION. Russia: Sakhalin, southern Kurile Islands (Kunashir: Map 3). — Japan (Hokkaido).

BIONOMICS. Brathinus oculatus was collected along banks of clear watercourses with moss-covered stones (Figs 9, 13). Numerous specimens were collected in debris at the bank of the thermal Goryachee Lake (Fig. 9).

REMARKS. Habitus as in Fig. 2.