s 



PREFACE 



In tlic present volume will be found chnracters of nearly 

 all the undescribed species of Dipterous Insects in my 

 collection which had been received to the end of the 

 year 1854. j\Ir. F. Walker, a gentleman well known 

 for his intimate acquaintance, with this Order of Insects, 

 has supplied the whole of the Manuscript. The Plates 

 have been furnished by Mr. Wkstwood, whose entomo- 

 logical knowledge and skill in the delineation of Insects 

 are universally admitted. To both I tender my best 

 thanks. 



W. WTT.SON SAUNDERS. 



Kast Hill, \V;.iiclswo!tli, 



J .111. ISlh, !»;-;(). 



