SYNOPSIS. Sarcocystis nesbitti n. sp. was found in the skeletal muscles of 2 of 44 Macaca mulatta monkeys. The cysts were 100‐1100 by 165 μ with a wall 1.2‐1.6 μ wide and contained trophozoites 7–9 by 2–3 μ. Sarcocystis kortei was found in 1 of the rhesus monkeys, 1 Erythrocebus patas and 1 Cercopithecus mitis. Its cysts were 400‐800 by 100‐150 μ, with a wall 5‐6 μ thick and trophozoites 9‐14 by 3‐4 μ.

It is the 1 st time to study sarcocysts of camels in Qena Governorate, 156 specimens of camels (Camelus dromedarius) were collected from different slaughtered-houses in Qena Governorate, the rate of infection with Sarcocystis was (42.3 %). Out of 126 males, 54 (42.85 %) were infected while the infected number of females were 12 (40 %) from 30 specimens. Morphological and ultrastructures of muscle stage (sarcocyst) have been reported and illustrated in this study by both light and electron microscope, TEM showed that there are two types of Sarcocystis in camels in Qena Governorate. Dogs that infected with camel's oesophagus muscles contain mature Sarcocystis excreated two different types of oocysts in their feaces after 13-15 days of infection. Detailed description of oocysts has been reported.

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SYNOPSIS. Sarcocystis garnhami n. sp. is described from an opossum, Didelphis marsupialis. Its distinguishing characters are the spiny cyst wall, 6–8 μ thick, and the size of the spores, 5.3–6.9 μ in length and 1.3–1.9 μ in breadth. Sarcocystis darlingi, Brumpt 1913 is considered Besnoitia darlingi (Brumpt, 1913) n. comb.