| abstract | The Ceratozetidae of arctic western North America, represented by 12 species in 9 gneera, are discussed. A new genus, Cyrtozetes, and species, Cyrtozetes denaliensis are proposed, and Trichoribates copperminensis Hammer, T. polaris Hammer, Svalbardia paludicola Thor, Iugoribates gracilis Sellnick, Diapterobates notatus (Thorell) both adults and immatures, D. variabilis Hammer, Sphaerozetes arcticus Hammer, Fuscozetes sellnicki Hammer, Melanozetes longisetosus Hammer, and Ceratozetzes spitsbergensis Thor and C. parvulus Sellnick are redescribed. Immatures of T. polaris, S. mpaludicola, F. sellnicki, and M. longisetosus are described. Distribution records of Ceratozetes gracilis (Michael) in the western North American arctic are listed. Teh new combination, Cyrtozetes shiranensis (Aoki and Fujikawa), is proposed. |