PREFATORY NOTE BY THE SENIOR AUTHOR 



Something should be said in explanation of the part that 

 has been taken by each of the authors in the preparation of 

 this book. It was begun under my direction by Miss 

 Hughes, now Mrs. John D. Tothill, when she was a graduate 

 student in my laboratory at Cornell University. It was 

 continued by her subsequently in Illinois, Wisconsin, 

 British Columbia, and especially at Frederickton, New 

 Brunswick. 



Meanwhile, Dr. Frost had begun the study of leaf-miners 

 at Cornell University under the direction of Dr. R. Matheson. 



When Mrs. Tothill was preparing to go with her husband 

 on an important scientific mission to the Fiji Islands (where 

 she has been during the final putting together of this book) 

 she appealed to me to find some means of completing it. 

 I, naturally, turned to Dr. Frost, and we agreed to complete 

 it together. 



My own part has been chiefly that of editing and writing 

 introductions, though I have contributed some notes and 

 illustrative material from my own rearings in each of the 

 four orders of leaf-miners. Dr. Frost has written the 

 chapter on Dipterous miners and has compiled the bibliog- 

 raphy and the tables of species and food plants for all four 

 orders. We have worked together on most of it. 



At the end of it we are all under obligation for help to 

 more people than we can now name. We are all indebted 

 first of all for generous and oft-repeated aid with the Lepi- 

 doptera to Dr. W. T. M. Forbes; likewise, with other orders, 

 to Dr. R. Matheson. Mrs. H. E. Seemann has been very 

 helpful in arranging the illustrations. I have been aided in 

 the collecting and preparation of materials by Miss Anne 

 Snitow and Miss Helen Albro. Mrs. Tothill has had the 

 aid of her husband, Dr. John D. Tothill, and of Mr. W. 



