VI PREFACE 



planatory page giving a detailed account of the changes made 

 in the present volume. The Introduction, by Professor Kin- 

 caid, and the papers on Myriapoda and Homoptera, are now 

 published for the first time. 



C. HART MERRIAM, 



Editor. 

 WASHINGTON, D. C., 



May i- 1903. 



