ACKNOWLEDGMENTS. 



My thanks are due Mr. G. C. Brackett, secretary of the Kansas States 

 Horticultural Society, who most kindly put at my disposal electrotypes 

 of figures 4, 37, 38, 39, 40, 41, 42, 43, 44, 46 (4), 48, 49, 50, 52, 54. All 

 of these figures are original with Dr. C. V, Riley. 



The electrotype of figure 45 was loaned by Prof. E. A. Popenoe, of 

 the State Agricultural College, Manhattan. 



The plate so fully illustrating the life-history of the Hessian Fly, 

 figure Hi, the various parts original with Riley, Burgess, and Packard, 

 was loaned by Hon. M. Mohler, secretary of the State Board of Agri- 

 culture. 



The plates for all the other figures (excepting figures 1 and 13, both 

 after Riley) were made expressly for this volume by A. Zeese & Co., of 

 Chicagt), from original drawings, and from reduced, rearranged or 

 otherwise altered copies of existing plates, as follows: Figures 2, 3, 5- 

 7, e of 12, a of 14, a, c of 17, a of 19, 20, 21, 22, 23, 6, d, e,f, g, h of 24, 

 a of 25, c, d, e of 27, 28 (2), b, d of 29, a of 30, a of 31, a of 32, a of 33, 

 c, d of 34, 35 (3), 53, a of 55, 56 (5), b, c of 57, 59, a of 60, and a, b, c of 

 61, are from original drawings made by Miss Mary Wellman, under 

 direction. Figure 6 is a copy of figures selected from plate i (J. H. 

 Emerton), First Annual Report of the U. S. Entomological Commission, 

 1878; figure 8 is a copy of figures from plate v. Thirteenth Report of the 

 Illinois State Entomologist (Prof. S. A. Forbes); figure 9 is after H. A. 

 Garman; figures 10 and 11 are copies (reduced and rearranged) in out- 

 line of the colored figures of plates A and B, Seventeenth Report of the 

 State Entomologist of Illinois (Prof. S. A. Forbes); a, b, c, d of figure 

 12 are figure 6; b and c of figure 14, e and / of 15, figure 18, and b of 

 19, are after Riley; c and d of figure 15 are after Glover; b and d of 

 figure 17 are after Forbes; a and c of figure 24 are after H. E. Weed; 

 b and c of figure 25 are after Curtis; figure 26 is after a cut in the Ameri- 

 can Naturalist {Tyroghjplius sacchari); a and b of figure 27, c of figure 

 29, b of figure 31, 6 of figure 32, b of figure 33, are after Riley; b of 

 figure 30 is after Scudder; a and b of figure 34 are after Popenoe; a of 

 figure 36 is after Riley, and b is after Weed; figure 47 is a rearranged 

 copy of portions of a figure original with Riley; figure 51 is after 

 Packard and Saunders; b of figure 55 is after Popenoe; a of figure 57 

 is after Riley; figure 58 is after Claparede; 6 and c of figure 60 are 

 after Riley. 



