X AUTHORS PREFACE. 



only the structural figures copied from Rothschild and 

 Jordan's ' Revision,' but also figures of types of species 

 described by Rothschild, Jordan, Hampson, Butler and 

 Walker. To this end some specimens were kindly loaned 

 from the Tring Museum, and others were made available by 

 permission of the Trustees of the British Museum. Mr. Tarns 's 

 help was freely given in his desire to render the book as complete 

 and useful as possible. 



We also desire to acknowledge the valuable help given 

 in collecting and breeding by Brigadier H. L. Scott, D,S.O., 

 M.C., brother of the junior author, and by Colonel Campbell, 

 D.S.O. 



In an* appendix we give a list of the 135 species and sub- 

 species of which the food-plants are known, together with the 

 names of these plants ; also an appendix containing a list 

 of the food-plants, with the species which feed upon them. 



T. R. D. Bell. 

 F. B. Scott. 



London, 

 June, 1937. 



