Protomagalhaensia wolfi n. comb. and Leidyana haasi n. comb. were originally described as species of Gregarina parasitizing the lobster cockroach, Nauphoeta cinerea, in east Africa. Gamonts of Protomagalhaensia species are elongate and serpentine in general shape. Species within the genus are differentiated primarily by epimerite and oocyst morphology. Among described species of Protomagalhaensia, only P. wolfi possesses an obdeltoid epimerite. The oocysts of P. wolfi possess no apical spine or knob and are notably larger than oocysts of other species in the genus. Among the 33 species of Leidyana, only L. haasi and Leidyana migrator are reported from cockroaches (Dictyoptera). In general, gamonts of L. migrator are longer and more anisometric than those of L. haasi, the greater length reflecting notably longer deutomerites in L. migrator. The gamontic protomerites of L. haasi are longer but considerably narrower than those of L. migrator even though gamonts of L. migrator are larger overall. Both L. migrator and L. haasi are characterized by elliptoid oocysts that differ in relative morphology and overall size. The elliptoid gametocysts of L. migrator are ca. 3 times larger than those of L. haasi. We redescribe P. wolfi and L. haasi and refer them to genera other than Gregarina, establish neotype specimens, revise the diagnosis of Protomagalhaensia to reflect oocyst variation within the genus and distinguish it from the other 15 genera comprising Hirmocystidae, and discuss the fidelity of endemic gregarine faunas with their cockroach hosts despite global host dispersal.