Abstract
Two new species of Geomylichus Fain, 1970 (Acari, Listrophoridae) are described from kangaroo rats from the U.S.A., Geomylichus intercalatus sp.n. from Dipodomys compactus from Texas and G. quasinudus sp.n. from Dipodomys ingens from California. New hosts and localities are recorded for G. dipodomius (Radford), G. microdipodops Fain et al. and G. texanus Fain et al. A key is given to the subgenus Geomylichus (Geomylichus).