Carpelimus rivularis (Motschulsky, 1860)†

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 : 52-53

Taxon classification Animalia Coleoptera Staphylinidae

Carpelimus rivularis (Motschulsky, 1860)† Figs 32-33

Material examined.

New Brunswick, Queens Co., Bayard near Nerepis River, 45.4442°N, 66.3292°W, 25.V.2008, R.P. Webster // Pond margin, in moist grass litter on mud (1 ♂, HNHM; 2 ♂, RWC). Saint John Co., Musquash, 45.1837°N, 66.3376°W, 7.V.2006, R.P. Webster, coll. // Inland margin of salt marsh, in litter on muddy soil (1 ♂, HNHM; 4 ♂, RWC). York Co., Keswick River at Rt. 105, 45.9938°N, 66.8344°W, 3.VI.2008, R.P. Webster // Silver maple swamp near river margin, in leaf and grass litter on mud/clay soil (1 ♂, RWC).

Distribution in Canada and Alaska.

NB (New Canadian record). Carpelimus spretus was synonymized with the Palaearctic Carpelimus rivularis (Motschulsky) by Bernhauer and Schubert (1911) and it was cited as such by Schülke and Smetana (2015: 784), although Downie and Arnett (1996) cited Carpelimus spretus as a valid species with the type localities (MD, NC, and PA). They also cited Carpelimus rivularis as "poorly known", but with two of the same localities, PA, MD (p. 443). The two species are clearly different and are treated as such here. Notman (1920) recorded rivularis from NY. Hatch (1957) further complicated the matter by including Carpelimus rivularis as a synonym of Carpelimus bilineatus Stephens from the Pacific Northwest.

Natural history.

Specimens were found on the inland margin of a salt marsh in litter on muddy soil, in moist grass litter on mud on a pond margin near a river, and in leaf and grass litter on mud/clay soil near a river margin in a silver maple swamp. Adults were collected during May and June.