Astenus americanus (Casey, 1905)

Webster, Reginald P., Davies, Anthony E., Klimaszewski, Jan & Bourdon, Caroline, 2016, Further contributions to the staphylinid fauna of New Brunswick, Canada, and the USA, with descriptions of two new Proteinus species (Coleoptera, Staphylinidae), ZooKeys 573, pp. 31-83 : 65

Taxon classification Animalia Coleoptera Staphylinidae

Astenus americanus (Casey, 1905)

Material examined.

New Brunswick, Charlotte Co., 5.2 km NW of Pomeroy Ridge, 45.3087°N, 67.4362°W, 5.VI.2008, R.P. Webster // Red maple swamp, in leaf litter and in near vernal pool (1 ♂, RWC). Northumberland Co., 12 km SSE of Upper Napan [Goodfellow Brook P.N.A.], 46.8943°N, 65.3796°W, 7.VI.2006, R..P. Webster // Eastern white cedar swamp, in moss & leaf litter (1 ♂, RWC). Saint John Co., Chance Harbour off Rt. 790, 45.1355°N, 66.3672°W, 15.V.2006, R.P. Webster // Calcareous fen, in sphagnum & litter in depressions with Carex (1 ♂, RWC). York Co., Charters Settlement, 45.8428°N, 66.7279°W, 15.IV.2005, R.P. Webster // Mixed forest, small sedge marsh in moist grass litter (1 sex undetermined, RWC); same locality and collector but 45.8267°N, 66.7343°W, 16.IV.2005 // Carex marsh, in litter & sphagnum at base of tree (2 sex undetermined, RWC); New Maryland, off Hwy 2, E of Baker Brook, 45.8760°N, 66.6252°W, 6.IV.2005, 26.IV.2005, R.P. Webster // Old-growth cedar swamp, in moss & litter at base of cedar (1 ♂, 1 sex undetermined, RWC); Canterbury, trail to Browns Mtn. Fen, 45.9033°N, 67.6260°W, 2.V.2005, M. Giguère & R. Webster // Mixed forest with cedar, margin of vernal pond in moist leaf litter (1 sex undetermined, RWC); Rt. 645 at Beaver Brook, 45.6840°N, 66.8679°W, 3.V.2008, R.P. Webster // Red maple/alder swamp, and in moist leaves near small vernal pool near small stream (1 ♂, RWC).

Distribution in Canada and Alaska.

ON, QC, NB ( Bousquet et al. 2013).

Natural history.

Astenus americanus was found in moist leaf litter, sphagnum and leaf litter, and in moist leaves on the margin of a vernal pond in forested wetlands. These included a red maple swamp, eastern white cedar swamps, mixed forests with cedar, a red maple/alder swamp, and a small sedge marsh in a mixed forest. Some individuals were found in a calcareous fen and a Carex marsh. Adults were collected in April, May, and June.