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First page of Nosema cactoblastis, sp. n., and Nosema cactorum, sp. n., Micro‐sporidian Parasites of Species of Cactoblastis (Lepidoptera) destructive to Prickly Pear. By H. B. Fantham, M.A. Cantab., D.Sc. Lond., F.R.S.S.Af., F.Z.S., Strathcona Professor of Zoology, McGill University, Montreal, Canada