Trachypachus Motschulsky, 1844

Bousquet, Yves, 2012, Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico, ZooKeys 245, pp. 1-1722 : 124

Genus Trachypachus Motschulsky, 1844

Trachypachus Motschulsky, 1844: 86. Type species: Blethisa zetterstedtii Gyllenhal, 1827 designated by Thomson (1859: 3). Etymology. Uncertain, possibly from the Greek trachelos (neck, by extension pronotum) contracted and pachys (thick), alluding to the convex pronotum (" corselet convexe, large ") or from the Greek trachys (uneven, rough) and pachys [masculine].

Trachypachys Gemminger and Harold, 1868a: 46. Unjustified emendation of Trachypachus Motschulsky, 1844.

Diversity.

Northern Hemisphere, with four species in the Nearctic (three species) and Palaearctic (one species) Regions.

Identification.

Lindroth (1961a: 1-4) reviewed the North American species and discussed the structural differences between the three taxa.