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Published online by Cambridge University Press: 31 May 2012
On the first of April 1927, the following letter, together with the tentative list of unknown nymphs referred to, was sent by the author to the following twelve Entomologists interested in American Odonata: Dr. C. S. Brimley, Dr. P. P. Calvert, Mr. W. T. Davis, Dr. Philip Garman. Dr. C. H. Kennedy. Mr. B. E. Montgomery, Dr. R. A. Muttkowki, Dr. R. H. Horve, Dr. R. C. Osborne, Dr. F. M. Root, Dr. E. M. Walker, and Mr. E. B. Williamson.