In the course of a limnological study of lakes of various salt concentrations in the Province of Saskatchewan, extending over a period of three years (1938-1940), Mr. J. E. Moore made extensive collections of aquatic organisms, among which was a considerable number of Odonata, both adults and nymphs. These were sent to the writer for determination and the records of such species as could be definitely identified were reported in our preliminary list of the Odonata of Saskatchewan (Walker '40).

On a recent visit to Cambridge I was permitted, through the courtesy of the Museum authorities, to examine the types of Chambers' numerous Coleophorid species deposited in this institution and to make genitalic slides of the material. This study has enabled me to clear up a number of doubts which have existed regarding the identity of certain of the species and, I hope, will put our knowledge of the group on a sounder basis than heretofore.

The following Canadian records of fleas occurring north of the 60th parallel have resulted from a recent study by the writer of the Siphonaptera contained in the Canadian National Collection at Ottawa. Most of the material dealt with here was collected by C. H. D. Clarke of the Bureau of Northwest Territories and Yukon Affairs, or by various officers of the Royal Canadian Mounted Police during the survey of the Thelon Game Sanctuary.

In compiling this check list, Dixa montana Brunetti and Dixa montana Garrett were found to be homonyms. With the permission of Mr. C. B. D. Garrett, D. montana Garrett is being changed to D. garretti to comply with Article 34 of the International Code of Zoological Nomenclature.