IV BULLETIN 15 7, U. S. NATIONAL MUSEUM 



Forbes, the late Dr. Harrison G. Dj^ar, Harold H. Shepard, and 

 John Barnes. Among those who have accompanied me on excur- 

 sions in the field are Dr. Karl Jordan, of Tring; Dr. H. Boschma, 

 of Leiden; Dr. Kai L. Henricksen, of Copenhagen; Dr. Torsten 

 Gislen, of Uppsala; Dr. William T. M. Forbes, Dr. William M. 

 Mann, Dr. Adam Boving, Herbert S. Barber, George K. Putnam, 

 Dr. Herbert Friedmann, A. Brazier Howell, Irvin N. Hoffman, 

 James A. Hyslop, and Foster H. Benjamin. 



I am indebted to Clement W. Baker, of Waynesburg, Ohio, for 

 a considerable number of specimens from his region for comparison 

 with local forms, and I am similarly indebted to Dr. G. W. Rawson, 

 of Detroit, Mich., and to C. V. Blackburn, of Stoneham, Mass. 



Dr. Hugh M. Smith, of Bangkok, Siam, was so very kind as to 

 provide me with Siamese butterflies for experimentation in regard 

 to the emanations from their wings, while Dr. Nagamichi Kuroda, 

 of Tokyo, and Prof. Tamigi Kawamura, of the Imperial University, 

 Kyoto, Japan, were so good as to send me specimens of the Japanese 

 forms of those wide-ranging species that occur both in the District 

 and in Japan. 



The Author. 



