4 U.S. NATIONAL MUSEUM BULLETIN 261 



indicated in the checklists include only those localities from which I 

 have seen accurately identified specimens. 



Acknowledgments. — ^The progress of this work has been aided by so 

 many people that apologies undoubtedly will be in order to some not 

 mentioned here. I have tried to avoid omissions of professional ento- 

 mologists but undoubtedly there are some. I have not attempted to list 

 the legion of splendid nonprofessional people who have helped in so 

 many ways, especially during the year when I was a foreigner in the 

 many countries I visited in Europe. 



First, much credit must go to the National Science Foundation, whose 

 assistance was essential. Second, I am no less indebted to North Carolina 

 State University for financial support, for making research time avail- 

 able, and for patience during the time necessary for the preparation of 

 this manuscript. 



Sincere gratitude is expressed to Mrs. Sue F. Skeele of the Entomology 

 Department of North Carolina State, who helped with proofreading 

 the manuscript. 



Dr. James P. Kramer of the U.S. Department of Agriculture criti- 

 cized the manuscript and made many useful suggestions. 



Finally, I wish to express my profound gratitude to my wife Irene, 

 who toiled many hours typing correspondence and manuscript and 

 reading proof during a busy year in Europe, and afterward. 



The following people were helpful in making specimens and study 

 facilities available, and in many other ways: 



Dr. Douglas Barnes, Rockefeller Foundation, Mexico (RFM). 



Dr. Max Beier, Naturhistorisches Museum, Vienna (NMV). 



Mr. Roland Benard, Mus6um National d'Histoire Naturelle, Paris 



(MHNP). 

 Dr. Lars Brundin and Dr. Eric Kjellander, Naturhistoriska Riksmuseet, 



Stockholm (RMS). 

 Dr. George W. Byers, University of Kansas, Lawrence (KU), 

 Dr. VV. E. China, Mr. R. J. Izzard, and Dr. W. J. Knight, British 



Museum (Natural History) (BM). 

 Dr. P. J. Darlington, Museum of Comparative Zoology, Harvard 



College (MCZ). 

 Mr. Robert Dreisbach, Midland, Michigan (RD). 

 Dr. Walter Forster and Dr. Heinz Freude, Zoologische Sammlung des 



Bayerischen Staates, Munich (SSM). 

 Dr. Paul Freytag, The Ohio State University (OSU). 

 Dr. J. Linsley Gressit, Bernice P. Bishop Museum, Hawaii (BPBM). 

 Dr. K. K. Giinther, Institut fiir Spezielle Zoologie und Zoologisches 



Museum der Humboldt-Universitat, East Berlin (HU). 



