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G. R. Osten-Sacken : Obser. on Termites found in California (Proc. Boston Soc., XIX, 1877).
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Maynard : Notes on the White Ants in the Bahamas (Psyche, V, 1888).
Dr Packard : Notes on the external anatomy (Third Report, U. S. Entom. Comm., 1883).
H. Mc E. Knower : The development of the Termites (John’s Hopkins University Circulars, vol. XII, no 126, 1883).
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Ch. Darwin : Recent researches on Termites and stungless honey bees (Amer. Nat., VIII, 1874).