SOURCES OF ILLUSTRATIONS 



THE author wishes to express his very sincere appreciation 

 of the courtesy extended him by those friends mentioned below 

 who have furnished or loaned him electrotypes, photographs or 

 drawings, thus making possible the ample illustration of this 

 volume. 



From the United States Department of Agriculture, through 

 the courtesy of Dr. L. O. Howard, Chief of the Bureau of 

 Entomology and of Mr. J. A. Arnold, Chief of the Division 

 of publications, the following illustrations were secured, either 

 as electrotypes or as new plates made from the original drawings 

 or photographs: Figs. 1, 2, 3, 4, 24, 50, 53, 55, 59, 61, 66, 83, 

 85, 86, 88, 90, 91, 93, 94, 95, 96, 101, 102, 103, 104, 105, 106, 

 110, 113, 114, 117, 124, 125, 126, 127,, 128, 129, 130, 131, 132, 

 133, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 148, 149, 

 150, 153, 154, 158, 159, 160, 161, 162, 163, 164, 167, 168, 170, 

 171, 172, 173, 174, 175, 176, 180, 181, 182, 183, 184, 185, 186, 

 187, 188, 189, 192, 198, 199, 200, 201, 202, 203, 204, 205, 206, 

 207, 208, 211, 216, 218, 221, 222, 223, 224, 225, 226, 227, 228, 

 230, 231, 232, 235, 236, 240, 241, 242, 244, 246, 247, 248, 257, 258, 

 262, 264, 265, 266, 270, 271, 272, 273, 274, 277, 281, 283, 285, 

 292, 293, 294, 295, 296, 297, 298, 300, 304, 306, 307, 325, 326, 

 353, 354, 355, 356, 377, 379, 394, 395, 396, 398, 400, 401, 402, 

 404, 406, 413, 431, 432, 438, 446, 449, 472, 474, 475, 480, 487, 

 490, 496, 497, 502, 503, 504, 505, 508, and 512. 



The following illustrations were originally prepared by Dr. 

 C. V. Riley and have been secured from various sources: Figs. 

 5, 7, 8, 9, 10, 12, 54, 60, 62, 63, 64, 65, 67, 68, 69, 74, 75, 76, 77, 



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