VI PREFACE. 



the artist's inability (through illness, etc.) to proceed 

 sufficiently fast with the colouring of the plates, and 

 eventually the difficulty had to be overcome by the 

 employment of Mr. F. W. Frohawk, whose beautiful 

 work during the last few years in the delineation of 

 larvse is so well known. 



GEO. T. PORRITT. 



Crosland Hall, Htjddersfield ; 



February, 1895. 



