Revision of the intertidal aleocharine genus Amblopusa Casey and description of the new genus Paramblopusa (Coleoptera: Staphylinidae)

A systematic revision of the aleocharine genus Amblopusa Casey is presented. Amblopusa Casey is redescribed, and three species are recognized, two of which are new (A. alaskana Ahn and Ashe and A. hokkaidona Ahn and Ashe). Late instar larvae of A. alaskana Ahn and Ashe are described. Boreorhadinus Sawada is synonymized under Amblopusa Casey and Boreorhadinus pacificus Sawada is synonymized under A. brevipes Casey. Type and paratypes of A. alaskana and A. hokkaidona are designated. Lectotype is designated for A. brevipes. New genus Paramblopusa is described to contain A. borealis. Lectotype and paralectotypes are designated for P. borealis. A key is provided for separation of the genera Amblopusa and Paramblopusa and the known species of Amblopusa, and illustrations of diagnostic features are presented.