Abstract
Three species of Chlamydatus Curtis described as new are: artemisiae, auratus and knighti.Seventeen other species recognized from North America are: arcuatus Kngt., associants (Uhl.), brevicornis Kngt., fulvipes Kngt., manzanitae Kngt., monilipes Van D., montanus Kngt., obliquus (Uhl.), opacus (Zett.), pallidicornis Kngt., pulicarius (Fall.), pullus (Reut.), ruficornis Kngt., schuhi Kngt., suavis (Reut.), uniformis (Uhl.), and wilkinsoni (D. & S.). Chlamydatus opacus (Zett.), is recorded for the first time from North America. Chlamydatus apiatus (Uhl.) and C. fumidus (Uhl.) are transferred to Plagiognathus Fieb., new combination. Genus Strophopoda Van D., formerly considered a synonym of Chlamydatus is reinstated to contain Strophopoda aprica Van D. Species are keyed and male genitalia are figured.