12 ILLINOIS BIOLOGICAL MONOGRAPHS [406 



R. Shelf ord, Hope Collections, Oxford; Professor David Sharpe, Cam- 

 bridge ; Professor Kolbe r Berlin ; Mr, P. Lesne, Paris. 



The following permitted me to study their private collections with 

 a considerable loss of time and attention: Dr. Walther Horn, Berlin; 

 Mr. Basil G. Nevinson, 3 Tedworth Scpiare, London; Mr. Gestro, 

 Genoa. 



A considerable number of men whose names appear below gave 

 me data on the distribution of the species in their collections, loaned 

 or presented specimens, or did similar service through making exten- 

 sive collections which were exchanged. For this I am debtor to Messrs. 

 C. F. Adams, C. N. Ainslie, Geo. G. Ainslie, E. M. Anderson, A. W. 

 Andrews, Germain Beaulieu, Biederman, Wm. Beutenmuller, Albert 

 L. Barrows, C. S. Brimley, T. C. Brues, T. D. A. Cockerell, I. W. 

 Cockle, Norman Criddle, F. F. Crevcoeur, C. C. Deam, G. M. Dodge, 

 Edwin H. Edwards, J. D. Evans, S. A. Forbes, E. P. Felt, E. D. Har- 

 ris, R. V. Harvey, G. W. Herrick, H. R. Hill, J. S. Hine, A. D. Hop- 

 kins, W. Horn, James Hunsen, S. A. Johnson, James Johnson, W. 

 Knaus, Chas. W. Leng, H. P. Loding, D. E. Lantz, W. Macintosh, 

 G. P. Mackenzie, L. E. Marmont, A. L. Melander, F. W. Nunenmacher, 

 W. E. Rumsey, L. E. Ricksecker, A. G. Ruthven, Franklin Sherman, 

 H. F. Snow, E. G. Smyth, Tom Spalding, Chas. Stevenson, T. B. Sy- 

 mons, H. B. Walden, H. F. Wickham, T. N. Willing, R. S. Woglum, 

 R. H. Wolcott, E. 0. Wooton, E. C. VanDyke, E. P. Venables, S. S. 

 Visher. 



