A new coccidian parasite of the genus Caryospora Léger, 1904 is described from the colubrid snake Psammophis schokari (Forskâl, 1775). Oocysts of Caryospora maxima sp. n. are spherical or subspherical, 43.0 (40.0-46.0) X 42.1 (40.0-44.0) pm, with smooth and bilayered oocyst wall ca. 2.0 μιη thick. A micropyle, oocyst residuum and polar granule are absent. Sporocysls are broadly ellipsoidal, 21.3 (21.0-22.0) x 16.3 (16.0-17.0) μιη, with smooth, colourless and unilayered sporocyst wall. Sticda and substieda bodies are present. Sporocyst residuum is present as compact mass of granules lying centrally between sporozoites. Sporozoitcs arc elongate, arranged head to tail within sporocyst. Caryospora maxima represents the first coccidian species described from Psammophis schokari.