vi PREFACE 



indebtedness. I cannot refrain from taking this 

 opportunity of expressing my gratitude to my old 

 friend and schoolmaster, the late Mr W. H. Poole of 

 Charterhouse, who first introduced me as a boy to 

 this group of insects whose study has since afforded 

 me so much pleasure and recreation both in the 

 laboratory and on the sunny heaths of Surrey and 

 elsewhere. To my friend and pupil Mr Kenneth W. 

 Merrylees I am much indebted for kind help with 

 many of the illustrations. 



0. H. L. 



CHARTERHOUSE, 

 GODALMING. 



Fetn*uary, 1913. 



