12 LITERATURE 



ant organs of the body. In most insects the 

 generative processes are situated at the hinder 

 end, and furnish very important characters in 

 classification. Here also are inserted, where 

 present, the setce or tails. 



So much for general features. The earnest 

 student should possess himself of "A Re- 

 visional Monograph of Recent Ephemeridae or 

 May Flies," by the Rev. A. E. Eaton, M.A., 

 published in the " Transactions of the Linnean 

 Society," and secondly, of " A Monographic 

 Revision and Synopsis of the Trichoptera of the 

 European Fauna," by Robert McLachlan, 

 F.R.S., F.L.S., published by John Van Voorst. 

 The Mr. Eaton has very kindly allowed me to 



RnS!"" publish here some notes on the EPHEMERID^, 

 which he drew up in MS. for Mr. Halford 

 many years ago, and entitled " An Unscientific 

 Analytical Synopsis of the Genera of British 

 Ephemeridae, based upon the Adult Flies " (the 

 imagines or spinners) . Personally, I have found 

 these notes invaluable, and all trout fishermen 

 may be glad to avail themselves of the ready 

 help thus afforded. 



Mr Eaton's An Unscientific Analytical Synopsis of the 

 EpHEiiE- 11 " Genera of British Ephemerida, based upon 

 the Adult Flies. 



i . Tail bristles three in number, all nearly of the 



same length ...... ^ 



Tail bristles two in number, the median 



bristle being aborted, or extremely rudi- 

 mentary 7 



2. Wings four in number 3 



