Further contributions to the staphylinid fauna of New Brunswick, Canada, and the USA, with descriptions of two new Proteinus species (Coleoptera, Staphylinidae) Author Webster, Reginald P. Author Davies, Anthony E. Author Klimaszewski, Jan Author Bourdon, Caroline text ZooKeys 2016 573 31 83 http://dx.doi.org/10.3897/zookeys.573.7830 journal article http://dx.doi.org/10.3897/zookeys.573.7830 1313-2970-573-31 23B3E2C9EA734934A83D4512681E2967 Taxon classification Animalia Coleoptera Staphylinidae Stenus (Tesnus) formicetorum Mannerheim, 1843 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., 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 (3 ♂, 5 ♀, RWC). York Co., Douglas, Currie Mountain, 45.9844°N , 66.7592°W , 27.V-10.VI.2013, C. Alderson & V. Webster // Mixed forest with Quercus rubra , Lindgren funnel trap in canopy of Quercus rubra (1 sex undetermined, AFC); Charters Settlement, 45.8456°N , 66.7267°W , 1.V.2010, R.P. Webster // Margin of beaver pond in leaf litter (1 ♂, RWC). Ontario, Manitouwadge, Black River, 18.IX.1989, under weeds in dried-up pool, T. Bakker (1 ♂, CNC). Distribution in Canada and Alaska. YK, AB, MB, ON, QC, NB ( Bousquet et al. 2013 ). This species is newly recorded from ON and NB. Natural history. Most specimens of Stenus formicetorum were found along a lake margin with emergent vegetation of Carex and grasses. Adults were collected by treading vegetation into water. One individual was sifted from leaf litter along the margin of a beaver pond, one was sifted from drift material (tree bud material) near an eddy area along a small rocky, clear, cold river margin, and another adult was captured in a Lindgren funnel trap in the canopy of a red oak in a mixed forest. This species was collected in May, June, and July in NB, and September in ON.