Taxon classification Animalia Coleoptera Staphylinidae

Stenus (Stenus) pluto Casey, 1884

Material examined.

New Brunswick, Albert Co., Caledonia Gorge P.N.A., 45.7930°N, 64.7764°W, 1.VII.2011, R.P. Webster // Small rocky clear cold river margin (Caledonia Creek), sifting drift material (tree bud material) near eddy area (1 ♂, RWC). Restigouche Co., Jacquet River Gorge P.N.A. 47.8256°N, 66.0770°W, 13.VIII.2010, R. P. Webster // Large shaded brook among cobblestones (1 ♀, RWC); Wild Goose Lake, 420 m elev., 47.8540°N, 68.3219°W, 7.VI.2011, R.P. Webster // Lake margin with emergent Carex and grasses, treading Carex and grasses (5 ♂, 2 ♀, RWC); Summit Lake, 47.7825°N, 68.3199°W, 7.VI.2011, R.P. Webster // Lake margin, Carex marsh, treading Carex hummocks and emergent vegetation (1 ♂, RWC).

Distribution in Canada and Alaska.

BC, SK, MB, ON, QC, NB (Bousquet et al. 2013).

Natural history.

Most specimens of Stenus pluto were found along lake margins (two sites) with emergent vegetation ( Carex, Carex hummocks, and grasses). Adults were collected by treading vegetation into water. One specimen was sifted from drift material (tree bud material) near an eddy area along a small rocky, clear, cold river margin and another was found among cobblestones along a large shaded brook. This species was collected in June, July, and August in NB.