216 THE CANADIAN ENTOMOLOGIST 



ODONATA AND EPHEMERID^. 



Contributions to Canadian Biology, being studies from the Bio- 

 logical Stations of Canada, 1911-1914, F"asciculus II — Fresh 

 Water Fish and Lake Biology. Supplement to the 47th Annual 

 Report of the Department of Marine and Fisheries; Fisheries 

 Branch. Ottawa. 1915. 



In this "Blue book," issued by the Dominion (Government, 

 there is a series of thirteen important papers dealing with the 

 aquatic fauna and flora of the eastern coast of the Georgian Bay 

 in Ontario. They are published in this wa\- in order to extend 

 the knowledge respecting the available food for fishes in these 

 waters, their parasitic enemies and other matters of biologic 

 interest. Three papers deal with aquatic insects. The first is b>- 

 Dr. K. M. Walker on "The Odonata of the \icinity of C.o Home 

 Bay," in which he records his observations on the Dragon and 

 Damsel flies to be found in the neighbourhood of the Biological 

 Station, with descriptive notes on more than sixty species. The 

 article is illustrated with two plates of structural details, five views 

 of the characteristic scenery, and a plan showing the seasonal 

 distribution of the species — the whole forming a most valuable 

 contribution to the knowledge of the life-histories of these attrac- 

 tive insects. 



The other papers of an entomological character are by Mr. 

 W. A. Clemens of the l^niverist>' of Toronto, and are entitled, 

 "Rearing Experiments and Pxology of Georgian Bay.Ephemeriche" 

 and "Life-histories of Georgian Bay Ephemeriche: observations on 

 Heptagenia and breeding experiments." In the former paper 

 twenty species are referred to and many of them described; and in 

 the latter, which deals onh' with a single but largely represented 

 genus of May-flies, there is given a key to the imagos and descrip- 

 tions of the nymphs and their life-histories. Six plates of nymphs 

 and details of structure add much to the value of the papers. 

 These insects, which are often to be found in enormous numbers, 

 supply a very important part of the food of many fishes. 



C.J.S. B. 



Mailed June 9, 1910. 



