GEORGIAN BAY EPHEMERID^ 116 



SESSIONAL PAPER No. 39b 



' nymphs were found. For instance, for most of the nymphs of the genus Heptagenia 

 which for the most part inhabit the swift water, a mixture of earth and sand was 

 placed in the bottom of the jar and a couple of stones to which the nymphs could 

 cling. Sticks were placed in the jars for the nymphs to crawl out upon when ready 

 to emerge and a constant stream of fresh water supplied. For the Hexagenia 

 nymphs, which were taken from deep water, the jar was partly filled with mud, 

 which was dredged up in the locality from which the nymphs were taken. This 

 was for the nymphs to burrow in. Only a trickling stream of water was necessary. 

 Blasturus and Caenis nymphs did not require running water, as they were taken 

 for the most part in ponds, pools and pot-holes in which the water was often almost 

 stagnant. However the water in the jars was changed every day or so. Some dead 

 leaves and twigs were placed in the bottom of the jar, to imitate the natural 

 conditions. 



Usually the stones placed in the jars were covered with algal forms upon which 

 the nymphs could feed, but often algal material scraped from the stones was 

 added. 



Wire cages were placed over the jars to catch the subimagos as they emerged. 

 It was impossible to set up breeding cages in the open on account of the changes 

 of level of the water in Georgian Bay and because of waves produced by winds, 

 or passing boats. Go Home River was too far from Station Island to be available. 



When the subimagos appeared they were transferred to other vessels, where 

 they were kept in an atmosphere very slightly humid and out of the direct sunlight, 

 until their final moult. The imagos were killed with potassium cyanide and then 

 preserved dry or in 70% alcohol. The final nymph slough and the subimago 

 exuvia were both preserved for future reference. 



In this way about 180 specimens were bred out. Altogether there were taken 

 29 species belonging to 16 genera. 



The following are the genera represented: 

 Sub-family Ephemerinae 1. Hexagenia. 



2. Ephemera. 



Sub-family Heptageninae 1. Heptagenia. 



2. Ecdyurus. 



Sub-family Baetinae. 1. Baetisca. 



2. Leptophlebia. 



3. Blasturus. 



4. Choroterpes. 



5. Ephemerella. 



6. Drunella. 



7. Caenis. 



8. Tricorythus. 



9. Chirotenetes. 



10. Siphlurus. 



11. Baetis. 



12. Cloeon. 



Dr. Anna H. Morgan was kind enough to identify a number of species for me. 

 396—8^ II 



