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Summary.

Haemogregarina tuatarae sp. n., is described from seven of 35 examples of the tuatara, Sphenodon punctatus (Gray), parasitized material being obtained from Stephen and Middle Trio Islands, Cook Strait. The species is differentiated from Haemogregarina lygosomarum Doré, the only reptilian haemogregarine previously described from New Zealand, chiefly on the grounds of gametocyte morphology, and its systematic position is discussed. All the smears studied are characterized by an exceedingly low parasite rate and a relative abundance of phagocytosed forms, these features being interpreted as probably indicative of old or chronic infections.