Abstract
Thirty-five species of Brazilian Tetranychidae are discussed, of which 7 are new: Oligonychus steinhaueri, Schizotetranychus rhynosperus, Eotetranychus nigrens, Platytetranychus spatulatus, P. elongatus, Mononychusmcgregori,, Tetranychus armipenis. The genus Acostanychus Livschitz is synonymized under Atrichoproctus Flechtmann (new synonymy).
