Thymalus marginicollis Chevrolat, 1842

Webster, Reginald P., Sweeney, Jon D. & DeMerchant, Ian, 2012, New Coleoptera records from New Brunswick, Canada: Trogossitidae, Cleridae, and Melyridae, with an addition to the fauna of Nova Scotia, ZooKeys 179, pp. 141-156 : 145-146

Thymalus marginicollis Chevrolat, 1842 Map 3

Material examined.

Additional New Brunswick records. Carleton Co., Meduxnekeag Valley Nature Preserve, 46.1907°N, 67.6740°W, 13.VIII.2006, R. P. Webster, mature mixed forest, in polypore fungi (2, RWC); Hartland, Becaguimec Island (in Saint John River), 46.3106°N, 67.5372°W, 13.IX.2006, R. P. Webster, old mixed forest, in large dried polypore fungus (on dead standing basswood) (1, RWC); Jackson Falls, Bell Forest, 46.2200°N, 67.7231°W, 12-19.VI.2008, R. P. Webster, mature hardwood forest, Lindgren funnel trap (1, AFC); same locality and habitat data but 20-26.V.2009, 21-18.VI.2009, 31.VII-7.VIII.2009, R. Webster & M.-A. Giguère, Lindgren funnel traps (4, AFC). Queens Co., Cranberry Lake P.N.A, 46.1125°N, 65.6075°W, 18-25.VI.2009, 21-27.V.2009, 5-11.VI.2009, 11-18.VI.2009, R. Webster & M.-A. Giguère, mature red oak forest, Lindgren funnel traps (5, AFC); same locality data and forest type, 25.V-7.VI.2011, M. Roy & V. Webster, Lindgren funnel trap (1, NBM). Restigouche, Co., Dionne Brook P.N.A., 47.9030°N, 68.3503°W, 30.V-15.VI.2011, M. Roy & V. Webster, old-growth northern hardwood forest, Lindgren funnel traps (3, AFC, NBM); same locality and collectors but 47.9064°N, 68.3441°W, 15-27.VI.2011, old-growth white spruce and balsam fir forest, Lindgren funnel trap (1, NBM). Sunbury Co., Acadia Research Forest, 45.9866°N, 66.3841°W, 2-9.VI.2009, R. Webster & M.-A. Giguère, mature (110-year-old) red spruce forest with scattered red maple and balsam fir, Lindgren funnel traps (2, AFC). York Co., near Browns Mountain Fen, 45.8876°N, 67.6560°W, 3.VIII.2006, R. P. Webster, mature hardwood forest, in slightly dried Pleurotis sp. on sugar maple (4, NBM, RWC); Charters Settlement, 45.8286 °N, 66.7365°W, 25.VII.2006, R. P. Webster, mixed forest, in polypore fungi on dead (standing) beech (1, RWC); 15 km W of Tracy off Rt. 645, 45.6848°N, 66.8821°W, 1-8.VI.2009, R. Webster & M.-A. Giguère, old red pine forest, Lindgren funnel traps (3, AFC).

Collection and habitat data.

Thymalus marginicollis was collected in Lindgren funnel traps in hardwood forests with sugar maple and American beech, an old-growth northern hardwood forest with sugar maple and yellow birch, an old red oak forest, mixed forests, a mature red spruce forest, and an old red pine forest. Adults were also collected from a large, dried polypore fungus on a dead, standing basswood ( Tilia americana L.), in a slightly dried Pleurotus mushroom on a dead, standing sugar maple, and from a polypore fungi on a dead, standing American beech tree. Barron (1971) reported this species from various polypore species and Majka (2011) reported that it was commonly captured in flight-intercept traps and on the polypore, Piptoporus betulinus (Fr.) Kar., growing on white birch ( Betula papyrifera Marsh.) in Nova Scotia. Adults were captured during May, June, July, August, and September.

Distribution in Canada and Alaska.

BC, AB, SK, MB, ON, QC, NB, NS, PE, NF ( Bousquet 1991; Majka 2011). Thymalus marginicollis was first reported from New Brunswick by Majka (2011) on the basis of one specimen collected by D.F. McAlpine on Todd’s Island (Charlotte Co.) during 2000. This species is common and widespread in New Brunswick and was most commonly detected using Lindgren funnel traps.