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