LIST OF FLIES AND WHEN THEY APPEAR. 



141 



following list in the hope that it contains information 

 which may prove useful. In mild seasons the various 

 dates given may be anticipated by three weeks or even 

 a month, and in cold, wintry seasons the flies may not 

 appear until a later date. Especially in the North 

 of England. 



Date of 

 General Appearance. Remarks. 



