246 THE CANADIAN ENTOMOLOGIST 



On Friday, the 29th, the visitors will be taken to Grimsby 

 and given an opportunity of seeing the results of economic work 

 in the Niagara fruit district. As the Toronto National Exhibition 

 will be going on that week, reduced railway fares will be available 

 from many points to that city. — C. J. S. B. 



NEW SPECIES AND NEW LIFE HISTORIES OF 

 EPHEMERIDiF: OR MAYFLIES. 



BY W. A. CLEMENS, TORONTO, OXT. 



While at the Go Home Bay Biological Station on Georgian 



Bay, during the summer of 1912, I niade a special study of the 



Ephemeridae of that district, under the direction of Dr. E. M. 



Walker, to whom I am much indebted for advice and kindly criti- 

 cism. A full account of the investigations will appear in the report 

 of the Marine Biological Stations of Canada, this paper being con- 

 fined chiefly to new species and new additions to 'the life-histories 

 of several forms. 



The work was carried on from May 25 to September 10, and 

 consisted chiefly in the collecting and rearing of nymphs or larvae. 

 Collections were made in as varied localities as possible, as there 

 are nymphs for almost every condition of fresh water. The 

 nymphs were taken to the laboratory in jars or bottles of water, 

 where they were examined under the binocular microscope and the 

 species separated. A number of each species were then transferred 

 to breeding jars, which consisted of glass vesvsels, fitted up as nearly 

 as possible to the conditions in which the nym.phs were found, and 

 supplied with running water. Over the jars, wire cages were 

 placed to catch the subimagos as they emerged. As the subi- 

 magos appeared, they were transferred to other vessels, where they 

 were kept until the final m.oult, which usually took place in a day 

 or two. The images were killed with potassium cyanide and then 

 preserved dry or in alcohol. The subimago exuvial and final 

 nymph sloughs were also preserved for future reference. In this 

 way about 180 specimens were bred out during the summer. The 

 following is a list of the forms, taken : 



August, 1913 



