Published online by Cambridge University Press: 31 May 2012
The recent acquisition, through the kindness of Rev. L. M. Stöhr, of exuviae of Gomphus amnicola Walsh, accompanied by adults found emerging, led the writer to examine such specimens of allied forms in the Royal Ontario Museum of Zoology as were available for comparison. As these proved inadequate for the purpose, I appealed to Professor C. H. Kennedy and Mr. E. B. Williamson and, through their kind and prompt response, I obtained sufficient material for the study of those species most nearly related to G. amnicola, viz., the members of the Stylurus group.