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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


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Ancillary