Mesostruma is redefined and reviewed. Six species are recognised:—M. browni Taylor, M. eccentrica sp. n., M. exolympica sp. n., M. laevigata Brown, M. loweryi sp. n., and M. turneri (Forel). Epopostruma monstrosa Viehmeyer, previously assigned to Mesostruma, is reassigned to Epopostruma as an unrecognisable species, its holotype being so damaged.
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Robert W. Taylor (1973) studied this question.
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