PREFACE ix 



ing of lai'v?e or the treatment of eggs, pupae, or moths. 

 Further details may be found in Packard's "Text- 

 book of Entomology." 



We owe thanks to Miss Edith Eliot for her unfailing 

 patience in photographing our caterj)illars, which need 

 more patience than any other " sitters " except, perhaps, 

 birds ; to Dr. A. S. Packard for the meanings of many 

 names ; to Dr. A. G. Mayer for reading the structural 

 part for us ; to Mr. D. W. Coquillett and Dr. William H. 

 Ashmead for lists of the parasitic flies preying upon 

 caterpillars; to the children who have brought us 

 specimens ; and to Mr. M. V. Slingerland for the use 

 of his excellent photograph of Bnjocampa rubicunda 

 larvae, larvae which we could not get when we wished 

 to photograph them. 



We have written a true book, and we hope that it 

 may prove a helpful one. If it is not interesting, the 

 fault is with us, not with the subject. 



