8 PREFACE. 



T. C. Barber, H. Dean, M. S. Dougherty, A. H. Rosenfeld, and G. A. 

 Runner; of Oklahoma, Messrs. C. E. Sanborn and A. L. Lovett; of 

 Arkansas, Dr. George F. Adams; of Mississippi, Messrs. Glenn W. 

 Herrick, R. W. Harned, S. F. Blumenfeld, and R. N. Lobdell; and of 

 Alabama, Dr. W. E. Hinds and Messrs. W. F. Turner and I. W. Car- 

 penter. The work has been facilitated by the commissioners of 

 agriculture of the various States, including Col. Charles Shuler, for- 

 mer commissioner of agriculture of Louisiana, Mr. H. E. Blakeslee, 

 commissioner of agriculture of Mississippi, and Mr. F. W. Gist, former 

 commissioner of agriculture of Oklahoma. 



The agents of the Bureau of Entomology who have contributed to 

 tins bulletin are: Messrs. F. C. Bishopp, J. C. Crawford, R. A. Cush- 

 man, F. L. Elliott, A. F. Felt, C. W. Flynn, J. B. Garrett, W. H. 

 Gilson, S. Goes, G. H. Harris, W. E. Hinds, W. H. Hoffman, T. E. 

 Holloway, C. E. Hood, W. A. Hooker, R. C. Howell, C. R. Jones, B. T. 

 Jordan, O. M. Lander, Thomas Lucas, E. A. McGregor, J. D. Mitchell, 

 A. C. Morgan, A. W. Morrill, D. C. Parman, T. C. Paulsen, H. Pinkus, 

 F. C. Pratt, V. I. Safro, E. A. Schwarz, J. S. Slack, G. D. Smith, 

 H. S. Smith, C. S. Spooner, E. S. Tucker, G. N. Wolcott, and W. W. 

 Yothers. Of these agents Dr. W. E. Hinds, who for several years 

 was the principal assistant in the cotton boll weevil investigations 

 of this bureau, was the most extensive contributor. To him we owe 

 a large share of the accurate data on the life history and habits of 

 the boll weevil. He also did a large amount of work in the prepara- 

 tion of Bulletin 51, upon which this publication is based. We have 

 attempted throughout the bulletin to credit the various agents with 

 the work for which they have been directly responsible, but in tins 

 place it must be stated that the results obtained are due to the 

 faithful and efficient service of the whole corps of entomologists who 

 have been associated with the writers. The work has also been 

 greatly facilitated by the constant interest and encouragement of 

 the chief of the bureau. 



Special credit is due to Mr. E. S. Tucker for skillful preparation of 

 the plates. 



The Authors. 



