vi Preface 



majority of Dipterous insects, for instance, have 

 never been reared, and only an insignificant minority 

 have been closely examined. 



In determining flies for the purposes of this book, 

 we have been aided by the experience and accurate 

 knowledge of the late Mr. R. H. Meade, of Bradford. 

 Mr. G. H. Verrall has been good enough to identify 

 for us the fly of Orthocladius. We have acknow- 

 ledged in the proper places our obligations to 

 Miss Dorothy Phillips and Mr. T. H. Taylor, both 

 of the Yorkshire College. We hope that these two 

 naturalists of the new generation may succeed as 

 well in the independent labours that await them as 

 in what they have done for us. Lastly, we have to 

 thank the Delegates of the Clarendon Press for the 

 liberality with which they have produced a book, 

 whose numerous illustrations render it costly, while 

 it appeals only to a limited public. 



