It really varied at times; certain forces were clearly dominated by Makedonians, perhaps some Greek mercenaries, at other times Machimoi archers, or even cavalry and infantry. In frontier armies, the opposite was almost certainly true. A grandson of the last native Egyptian Pharaoh, Nectanebo, was the supreme commander of some part of the Ptolemaic Western frontier, and his forces seem to have been comprised largely of light Egyptian levies, Makedonians drawn from garissons, and whatever other bizarre mercenaries had been settled around. Depending on the region, the size of the army, and the intent of the campaign, it could be a simple phalanx+cavalry mix, or a core phalanx with a huge variety of supporting auxiliaries; Ethiopians, Egyptians, Cretans, Libyans, etc. So, most of the stuff they have access to, could be comfortably associated with a Makedonian army.
If you're really interested in Ptolemaic history, and willing to invest some money, I really really really recommend Gunter Holbl's fantastic book.
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