Two new species of Eupalopsellidae (Acari : Prostigmata), Eupalopsis jamesi and Exothorhis echinocactii, are described, and the presence of a third, Saniosulus nudus Summers, is recorded from Australia. Four species of this family, most of which feed on armoured scale insects, are now known from Australia. Keys to females of these four species, and to the females of Eupalopsis Canestrini and Exothorhis Summers, are provided.