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principal entomologist, in charge, Insects Affecting Man r>nd Animals; 
C. F. V. Muesebeck, principal entomologist, in charge, Insect- 
Identification; L. A. Hawkins, principal physiologist, in charge, 
Control Investigations; and C. M. Smith, senior chemist, and H. A. 
Jones, associate chemist, Insecticide Investigations, Bureau of 
Entomology and Plant Quarantine; W. S. Abbott, Insecticide Control 
Division, Food and Drug Administration; H. B. Haag, Medical College 
of Virginia, Richmond, Va. ; E. P. Killip, Smithsonian Institution; 
and A. F. Sievers, Drug and. Related Plants, and C. 0. Erlanson, Plant 
Exploration and Introduction, Bureau of Plant Industry. 
The assistance of specialists in the Division of Insect Identifi- 
cation, Bureau of Entomology and Flant Quarantine, in classifying the 
insects mentioned herein as to order and family is greatefully acknowledged. 
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